Revista CD Expert 8/Revista CD Expert nº 08 CD1.iso/Utilitarios/Programacao/MS-DOS Interrupt List/inter60c/INTERRUP.N

Text File | 1999-01-03 | 282KB | 7,248 lines

Interrupt List, part 14 of 18
Copyright (c) 1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999 Ralf Brown
--------D-31---------------------------------
INT 31 - overwritten by CP/M jump instruction in INT 30
--------v-31---------------------------------
INT 31 - VIRUS - "Vacsina" series - INSTALLATION CHECK (NOT A VECTOR!)
Note:    if one of the Vacsina viruses is resident, the low byte of this
      interrupt still contains the last byte of the INT 30 CP/M JMP
      instruction, but the remaining three bytes are 7Fh 39h followed
      by the Vacsina version number
SeeAlso: INT 21/AX=FFFFh"VIRUS",INT 32"VIRUS"
--------E-310000-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE LDT DESCRIPTORS
    AX = 0000h
    CX = number of descriptors to allocate
Return: CF clear if successful
        AX = base selector
    CF set on error
        AX = error code (DPMI 1.0+) (see #03143)
Notes:    DPMI is the DOS Protected-Mode Interface
    the base and limit of the returned descriptors will be 0, and the type
      will be "data"
    add the value returned by INT 31/AX=0003h to move to subsequent
      descriptors if multiple descriptors were allocated
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0001h,AX=000Dh,INT 21/AX=3501h

(Table 03143)
Values for DPMI 1.0 error code:
 0000h-7FFFh DOS error passed through by DPMI
 8001h    unsupported function
 8002h    object in wrong state for function
 8003h    system integrity would be endangered
 8004h    deadlock detected
 8005h    pending serialization request cancelled
 8010h    out of DPMI internal resources
 8011h    descriptor unavailable
 8012h    linear memory unavailable
 8013h    physical memory unavailable
 8014h    backing store unavailable
 8015h    callback unavailable
 8016h    handle unavailable
 8017h    maximum lock count exceeded
 8018h    shared memory already serialized exclusively by another
 8019h    shared memory already serialized shared by another client
 8021h    invalid value for numeric or flag parameter
 8022h    invalid segment selector
 8023h    invalid handle
 8024h    invalid callback
 8025h    invalid linear address
 8026h    request not supported by hardware
--------E-310001-----------------------------
INT 31 P - DPMI 0.9+ - FREE LDT DESCRIPTOR
    AX = 0001h
    BX = selector to free
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8022h) (see #03143)
Notes:    only one descriptor is freed per call
    the program's initial CS, DS, and SS descriptors may be freed
    (DPMI 1.0+) any segment registers containing the freed selector are
      set to 0000h
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0000h,AX=000Ah,AX=000Dh,INT 21/AX=3502h
--------E-310002-----------------------------
INT 31 P - DPMI 0.9+ - SEGMENT TO DESCRIPTOR
    AX = 0002h
    BX = real mode segment
Return: CF clear if successful
        AX = selector corresponding to real mode segment (64K limit)
    CF set on error
        AX = error code (DPMI 1.0+) (8011h) (see #03143)
Notes:    multiple calls for the same real mode segment return the same selector
    the returned descriptor can never be modified or freed
    not supported by MS Windows 3.0 in Standard mode
--------E-310003-----------------------------
INT 31 P - DPMI 0.9+ - GET NEXT SELECTOR INCREMENT VALUE
    AX = 0003h
Return: CF clear
        AX = value to add to get next sequential selector
Notes:    the increment will be a power of two
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0000h
--------E-310004-----------------------------
INT 31 P - DPMI 0.9+ - LOCK SELECTOR
    AX = 0004h
    BX = selector to lock (prevent paging)
Return: ???
Note:    although marked as reserved in versions 0.9 and 1.0 of the DPMI
      specification, this function is called by MS Windows TASKMAN,
      PROGMAN, and KERNEL
SeeAlso: AX=0005h,AX=0600h
--------E-310005-----------------------------
INT 31 P - DPMI 0.9+ - UNLOCK SELECTOR
    AX = 0005h
    BX = selector to unlock (permit paging)
Return: ???
Note:    although marked as reserved in versions 0.9 and 1.0 of the DPMI
      specification, this function is called by MS Windows TASKMAN,
      PROGMAN, and KERNEL
SeeAlso: AX=0004h,AX=0601h
--------E-310006-----------------------------
INT 31 P - DPMI 0.9+ - GET SEGMENT BASE ADDRESS
    AX = 0006h
    BX = selector
Return: CF clear if successful
        CX:DX = linear base address of segment
    CF set on error
        AX = error code (DPMI 1.0+) (8022h) (see #03143)
Note:    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0007h,INT 21/AX=3504h
--------E-310007-----------------------------
INT 31 P - DPMI 0.9+ - SET SEGMENT BASE ADDRESS
    AX = 0007h
    BX = selector
    CX:DX = linear base address
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8022h,8025h) (see #03143)
Notes:    only modify descriptors allocated with INT 31/AX=0000h
    only the low 24 bits of the address will be used by 16-bit DPMI
      implementations even on a 386 or higher
    DPMI 1.0+ automatically reloads any segment registers containing the
      selector being modified
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0006h,AX=0008h,AX=0009h,AX=000Ch,INT 21/AX=3503h
SeeAlso: INT 21/AH=E9h"OS/286",INT 2C/AX=0002h
--------E-310008-----------------------------
INT 31 P - DPMI 0.9+ - SET SEGMENT LIMIT
    AX = 0008h
    BX = selector
    CX:DX = segment limit
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8021h,8022h,8025h) (see #03143)
Notes:    CX must be zero for 16-bit DPMI implementations
    limits greater than 1MB must be page aligned (low 12 bits set)
    only modify descriptors allocated with INT 31/AX=0000h
    DPMI 1.0+ automatically reloads any segment registers containing the
      selector being modified
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0007h,AX=0009h,AX=000Ch,INT 21/AX=3505h,INT 21/AH=E9h"OS/286"
SeeAlso: INT 2C/AX=0003h,#00501 at INT 15/AH=89h
--------E-310009-----------------------------
INT 31 P - DPMI 0.9+ - SET DESCRIPTOR ACCESS RIGHTS
    AX = 0009h
    BX = selector
    CL = access rights/type byte (see #00502 at INT 15/AH=89h)
    CH = 80386 extended rights/type byte (see #00505 at INT 15/AH=89h)
        (32-bit DPMI implementations only)
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8021h,8022h,8025h) (see #03143)
Notes:    if the Present bit is clear, CL bits 0-3 may have any value
    DPMI 1.0+ automatically reloads any segment registers containing the
      selector being modified
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0007h,AX=0008h,AX=000Ch,INT 21/AX=2514h,INT 2C/AX=0004h
SeeAlso: INT 2C/AX=0005h
--------E-31000A-----------------------------
INT 31 P - DPMI 0.9+ - CREATE ALIAS DESCRIPTOR
    AX = 000Ah
    BX = selector
Return: CF clear if successful
        AX = new data selector
    CF set on error
        AX = error code (DPMI 1.0+) (8011h,8022h) (see #03143)
Notes:    fails if selector in BX is not a code segment or is invalid
    use INT 31/AX=0001h to free new selector
    future changes to the original selector will not be reflected in the
      returned alias selector
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0001h
--------E-31000B-----------------------------
INT 31 P - DPMI 0.9+ - GET DESCRIPTOR
    AX = 000Bh
    BX = LDT selector
    ES:(E)DI -> 8-byte buffer for copy of descriptor
Return: CF clear if successful
        buffer filled
    CF set on error
        AX = error code (DPMI 1.0+) (8022h) (see #03143)
Notes:    16-bit programs use ES:DI as pointer, 32-bit must use ES:EDI
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=000Ch
--------E-31000C-----------------------------
INT 31 P - DPMI 0.9+ - SET DESCRIPTOR
    AX = 000Ch
    BX = LDT selector
    ES:(E)DI -> 8-byte buffer containing descriptor
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8021h,8022h,8025h) (see #03143)
Notes:    16-bit programs use ES:DI as pointer, 32-bit must use ES:EDI
    only modify descriptors allocated with INT 31/AX=0000h
    DPMI 1.0+ automatically reloads any segment registers containing the
      selector being modified
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=000Bh
--------E-31000D-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE SPECIFIC LDT DESCRIPTOR
    AX = 000Dh
    BX = LDT selector
Return: CF clear if successful
        descriptor allocated
    CF set on error
        AX = error code (DPMI 1.0+) (8011h,8022h) (see #03143)
Notes:    free descriptor with INT 31/AX=0001h
    the first 16 descriptors (04h-7Ch) are reserved for this function, but
      some may already be in use by other applications under DPMI 0.9;
      DPMI 1.0 guarantees 16 descriptors per client
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0000h,AX=0001h
--------E-31000E-----------------------------
INT 31 P - DPMI 1.0+ - GET MULTIPLE DESCRIPTORS
    AX = 000Eh
    CX = number of descriptors to copy
    ES:(E)DI -> descriptor buffer (see #03144)
Return: CF clear if successful
        descriptors copied
    CF set on error
        AX = error code (8022h) (see #03143)
        CX = number of descriptors successfully copied
Notes:    16-bit programs use ES:DI as pointer, 32-bit must use ES:EDI
    if the function fails, the first CX descriptors are valid; the
      remainder are not modified
SeeAlso: AX=000Bh,AX=000Fh

Format of DPMI descriptor buffer entry (one per descriptor to get):
Offset    Size    Description    (Table 03144)
 00h    WORD    selector (set by client)
 02h    QWORD    descriptor (set by host)
--------E-31000F-----------------------------
INT 31 P - DPMI 1.0+ - SET MULTIPLE DESCRIPTORS
    AX = 000Fh
    CX = number of descriptors to copy
    ES:(E)DI -> descriptor buffer (see #03145)
Return: CF clear if successful
        descriptors copied
    CF set on error
        AX = error code (8021h,8022h,8025h) (see #03143)
        CX = number of descriptors successfully copied
Notes:    16-bit programs use ES:DI as pointer, 32-bit must use ES:EDI
    if the function fails, the first CX descriptors are valid; the
      remainder are not modified
    DPMI 1.0+ automatically reloads any segment registers containing a
      selector being modified
SeeAlso: AX=000Ch,AX=000Eh

Format of DPMI descriptor buffer entry (one per descriptor to set):
Offset    Size    Description    (Table 03145)
 00h    WORD    selector
 02h    QWORD    descriptor
--------E-310100-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE DOS MEMORY BLOCK
    AX = 0100h
    BX = number of paragraphs to allocate
Return: CF clear if successful
        AX = real mode segment of allocated block
        DX = first selector for allocated block
    CF set on error
        AX = DOS error code (07h,08h) (see #01680 at INT 21/AH=59h/BX=0000h)
        (DPMI 1.0+) DPMI error code (8011h) (see #03143)
        BX = size (in paragraphs) of largest available block
Notes:    multiple contiguous selectors are allocated for blocks of more than 64K
      if the caller is a 16-bit program
    never modify or deallocate returned descriptors
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0101h,AX=0501h
--------E-310101-----------------------------
INT 31 P - DPMI 0.9+ - FREE DOS MEMORY BLOCK
    AX = 0101h
    DX = selector of block
Return: CF set if successful
    CF set on error
        AX = DOS error code (07h,09h) (see #01680 at INT 21/AH=59h/BX=0000h)
Notes:    all descriptors allocated for the block are automatically freed
    DPMI 1.0+ automatically zeros any segment registers containing a
      selector freed by this function
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0100h,AX=0102h,AX=0502h
--------E-310102-----------------------------
INT 31 P - DPMI 0.9+ - RESIZE DOS MEMORY BLOCK
    AX = 0102h
    BX = new block size in paragraphs
    DX = selector of block
Return: CF clear if successful
    CF set on error
        AX = DOS error code (07h,08h,09h)
          (see #01680 at INT 21/AH=59h/BX=0000h)
        (DPMI 1.0+) DPMI error code (8011h,8022h) (see #03143)
        BX = maximum block size (in paragraphs) possible
Notes:    increasing the size of a block past a 64K boundary will fail if the
      next descriptor in the LDT is already in use
    shrinking a block past a 64K boundary will cause some selectors to be
      freed; DPMI 1.0+ automatically zeros any segment registers containing
      a selector freed by this function
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0100h
--------E-310200-----------------------------
INT 31 P - DPMI 0.9+ - GET REAL MODE INTERRUPT VECTOR
    AX = 0200h
    BL = interrupt number
Return: CF clear
    CX:DX = segment:offset of real mode interrupt handler
Note:    the DPMI implementation is required to support all 256 vectors
SeeAlso: AX=0201h,AX=0204h,INT 21/AX=2503h
--------E-310201-----------------------------
INT 31 P - DPMI 0.9+ - SET REAL MODE INTERRUPT VECTOR
    AX = 0201h
    BL = interrupt number
    CX:DX = segment:offset of real mode handler
Return: CF clear
Note:    all memory that may be touched by a hardware interrupt handler must be
      locked down with INT 31/AX=0600h
SeeAlso: AX=0200h,AX=0205h,AX=0600h,INT 21/AX=2505h
--------E-310202-----------------------------
INT 31 P - DPMI 0.9+ - GET PROCESSOR EXCEPTION HANDLER VECTOR
    AX = 0202h
    BL = exception number (00h-1Fh)
Return: CF clear if successful
        CX:(E)DX = selector:offset of handler
    CF set on error
        AX = error code (DPMI 1.0+) (8021h) (see #03143)
Notes:    16-bit programs receive the pointer in CX:DX, 32-bit programs in CX:EDX
    DPMI 1.0+ supports this function only for backward compatibility; use
       AX=0210h or AX=0211h instead
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0203h,AX=0210h,AX=0211h,INT 2F/AX=FB42h/BX=0021h
--------E-310203-----------------------------
INT 31 P - DPMI 0.9+ - SET PROCESSOR EXCEPTION HANDLER VECTOR
    AX = 0203h
    BL = exception number (00h-1Fh)
    CX:(E)DX = selector:offset of handler
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8021h,8022h) (see #03143)
Notes:    32-bit programs must supply an offset in EDX and use a 32-bit interrupt
      stack frame on chaining to the next exception handler
    the handler should return using a FAR return
    all fault stack frames contain an error code, but it is only valid for
      exceptions 08h and 0Ah-0Eh
    handlers will only be called if the exception occurs in protected mode,
      and the DPMI host does not transparently handle the exception
    the handler may change certain values on the stack frame
      (see #03146,#03147)
    DPMI 1.0+ supports this function only for backward compatibility; use
       AX=0212h or AX=0213h instead
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0202h,AX=0212h,AX=0213h,INT 2F/AX=FB42h/BX=0022h

Format of stack frame for 16-bit programs: (offset from SS:SP)
Offset    Size    Description    (Table 03146)
 00h    DWORD    return CS:IP (do not change)
 04h    WORD    error code
 06h    DWORD    CS:IP of exception
 0Ah    WORD    flags
 0Ch    DWORD    SS:SP

Format of stack frame for 32-bit programs: (offset from SS:ESP)
Offset    Size    Description    (Table 03147)
 00h    DWORD    return EIP (do not change)
 04h    WORD    return CS selector (do not change)
 06h    WORD    reserved (do not change)
 08h    DWORD    error code
 0Ch    DWORD    EIP of exception
 10h    WORD    CS selector of exception
 12h    WORD    reserved (do not change)
 14h    DWORD    EFLAGS
 18h    DWORD    ESP
 1Ch    WORD    SS
 1Eh    WORD    reserved (do not change)
--------E-310204-----------------------------
INT 31 P - DPMI 0.9+ - GET PROTECTED MODE INTERRUPT VECTOR
    AX = 0204h
    BL = interrupt number
Return: CF clear
    CX:(E)DX = selector:offset of handler
Notes:    16-bit programs use CX:DX, 32-bit programs use CX:EDX
    DPMI implementations are required to support all 256 vectors
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0200h,AX=0205h,INT 21/AX=2502h,INT 2C/AX=0006h
SeeAlso: INT 2F/AX=FB42h/BX=0024h
--------E-310205-----------------------------
INT 31 P - DPMI 0.9+ - SET PROTECTED MODE INTERRUPT VECTOR
    AX = 0205h
    BL = interrupt number
    CX:(E)DX = selector:offset of handler
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8022h) (see #03143)
Notes:    16-bit programs use CX:DX, 32-bit programs use CX:EDX
    32-bit programs must use a 32-bit interrupt stack frame when chaining
      to the next handler
    DPMI implementations are required to support all 256 vectors
    hardware interrupts are reflected to the virtual machine's primary
      client, software interrupts to the current client
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0201h,AX=0204h,INT 21/AX=2504h,INT 2C/AX=0007h
SeeAlso: INT 2F/AX=FB42h/BX=0025h
--------E-310210-----------------------------
INT 31 P - DPMI 1.0+ - GET PROTECTED MODE EXTENDED PROCESSOR EXCEPTION HANDLER
    AX = 0210h
    BL = exception number (00h-1Fh)
Return: CF clear if successful
        CX:(E)DX = selector:offset of exception handler
    CF set on error
        AX = error code (8021h) (see #03143)
Note:    DPMI host reflects exception to current client's handler
SeeAlso: AX=0202h,AX=0211h,AX=0212h
--------E-310211-----------------------------
INT 31 P - DPMI 1.0+ - GET REAL MODE EXTENDED PROCESSOR EXCEPTION HANDLER
    AX = 0211h
    BL = exception number (00h-1Fh)
Return: CF clear if successful
        CX:(E)DX = selector:offset of exception handler
    CF set on error
        AX = error code (8021h) (see #03143)
Notes:    returns address of protected-mode handler for real-mode exception
    DPMI host performs a switch to protected mode, reflects the exception
      to the virtual machine's primary client, and returns to real mode
      on the handler's completion
SeeAlso: AX=0202h,AX=0210h,AX=0213h
--------E-310212-----------------------------
INT 31 P - DPMI 1.0+ - SET PROTECTED MODE EXTENDED PROCESSOR EXCEPTION HANDLER
    AX = 0212h
    BL = exception or fault number (00h-1Fh)
    CX:(E)DX = exception handler selector:offset
Return: CF clear if successful
    CF set on error
        AX = error code (8021h,8022h) (see #03143)
Note:    DPMI host sends exception to current client's handler
SeeAlso: AX=0203h,AX=0210h,AX=0213h
--------E-310213-----------------------------
INT 31 P - DPMI 1.0+ - SET REAL MODE EXTENDED PROCESSOR EXCEPTION HANDLER
    AX = 0213h
    BL = exception or fault number (00h-1Fh)
    CX:(E)DX = exception handler selector:offset
Return: CF clear if successful
    CF set on error
        AX = error code (8021h,8022h) (see #03143)
Notes:    specifies address of protected-mode handler for real-mode exception
    DPMI host performs a switch to protected mode, reflects the exception
      to the virtual machine's primary client, and returns to real mode
      on the handler's completion
SeeAlso: AX=0203h,AX=0211h,AX=0212h
--------E-310300-----------------------------
INT 31 P - DPMI 0.9+ - SIMULATE REAL MODE INTERRUPT
    AX = 0300h
    BL = interrupt number
    BH = flags
        bit 0: reset the interrupt controller and A20 line (DPMI 0.9)
            reserved, must be 0 (DPMI 1.0+)
        others: reserved, must be 0
    CX = number of words to copy from protected mode to real mode stack
    ES:(E)DI = selector:offset of real mode call structure (see #03148)
Return: CF clear if successful
        real mode call structure modified (all fields except SS:SP, CS:IP
          filled with return values from real mode interrupt)
    CF set on error
        AX = error code (DPMI 1.0+) (8012h,8013h,8014h,8021h)(see #03143)
    protected mode stack unchanged
Notes:    16-bit programs use ES:DI as pointer, 32-bit programs use ES:EDI
    CS:IP in the real mode call structure is ignored for this call,
      instead, the indicated interrupt vector is used for the address
    the flags in the call structure are pushed on the real mode stack to
      form an interrupt stack frame, and the trace and interrupt flags are
      clear on entry to the handler
    DPMI will provide a small (30 words) real mode stack if SS:SP is zero
    the real mode handler must return with the stack in the same state as
      it was on being called
SeeAlso: AX=0302h,AX=FF01h,INT 21/AX=2511h,INT 21/AH=E3h"OS/286"
SeeAlso: INT 2C/AX=0026h,INT 2F/AX=FB42h/BX=000Dh

Format of DPMI real mode call structure:
Offset    Size    Description    (Table 03148)
 00h    DWORD    EDI
 04h    DWORD    ESI
 08h    DWORD    EBP
 0Ch    DWORD    reserved (00h)
 10h    DWORD    EBX
 14h    DWORD    EDX
 18h    DWORD    ECX
 1Ch    DWORD    EAX
 20h    WORD    flags
 22h    WORD    ES
 24h    WORD    DS
 26h    WORD    FS
 28h    WORD    GS
 2Ah    WORD    IP
 2Ch    WORD    CS
 2Eh    WORD    SP
 30h    WORD    SS
--------E-310301-----------------------------
INT 31 P - DPMI 0.9+ - CALL REAL MODE PROCEDURE WITH FAR RETURN FRAME
    AX = 0301h
    BH = flags
        bit 0: reset the interrupt controller and A20 line (DPMI 0.9)
            reserved, must be 0 (DPMI 1.0+)
        others: reserved must be 0
    CX = number of words to copy from protected mode to real mode stack
    ES:(E)DI = selector:offset of real mode call structure
          (see #03148 at INT 31/AX=0300h)
Return: CF clear if successful
        real mode call structure modified (all fields except SS:SP, CS:IP
          filled with return values from real mode interrupt)
    CF set on error
        AX = error code (DPMI 1.0+) (8012h,8013h,8014h,8021h)(see #03143)
    protected mode stack unchanged
Notes:    16-bit programs use ES:DI as pointer, 32-bit programs use ES:EDI
    the real mode procedure must exit with a FAR return
    DPMI will provide a small (30 words) real mode stack if SS:SP is zero
    the real mode handler must return with the stack in the same state as
      it was on being called
SeeAlso: AX=0300h,AX=0302h,AX=FF02h,INT 21/AX=250Eh,INT 21/AH=E1h"OS/286"
SeeAlso: INT 2C/AX=0025h
--------E-310302-----------------------------
INT 31 P - DPMI 0.9+ - CALL REAL MODE PROCEDURE WITH IRET FRAME
    AX = 0302h
    BH = flags
        bit 0: reset the interrupt controller and A20 line (DPMI 0.9)
            reserved, must be 0 (DPMI 1.0+)
        others: reserved, must be 0
    CX = number of words to copy from protected mode to real mode stack
    ES:(E)DI = selector:offset of real mode call structure
          (see #03148 at INT 31/AX=0300h)
Return: CF clear if successful
        real mode call structure modified (all fields except SS:SP, CS:IP
          filled with return values from real mode interrupt)
    CF set on error
        AX = error code (DPMI 1.0+) (8012h,8013h,8014h,8021h)(see #03143)
    protected mode stack unchanged
Notes:    16-bit programs use ES:DI as pointer, 32-bit programs use ES:EDI
    the flags in the call structure are pushed on the real mode stack to
      form an interrupt stack frame, and the trace and interrupt flags are
      clear on entry to the handler
    the real mode procedure must exit with an IRET
    DPMI will provide a small (30 words) real mode stack if SS:SP is zero
    the real mode handler must return with the stack in the same state as
      it was on being called
SeeAlso: AX=0300h
--------E-310303-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE REAL MODE CALLBACK ADDRESS
    AX = 0303h
    DS:(E)SI = selector:offset of procedure to call
    ES:(E)DI = selector:offset of real mode call structure (see #03148)
Return: CF clear if successful
        CX:DX = segment:offset of real mode call address (see #03149)
    CF set on error
        AX = error code (DPMI 1.0+) (8015h) (see #03143)
Notes:    the real mode call structure is static, causing reentrancy problems;
      its contents are only valid at the time of a callback
    the called procedure must modify the real mode CS:IP before returning
    values are returned to real mode by modifying the real mode call struc
    DPMI hosts must provide at least 16 callbacks per client
    the limited DPMI host built into Phar Lap's 286|DOS-Extender v2.5 does
      not support this function
SeeAlso: AX=0304h,AX=0C00h

(Table 03149)
Values DPMI real-mode callback procedure is called with:
    DS:(E)SI = selector:offset of real mode SS:SP
    ES:(E)DI = selector:offset of real mode call structure
    SS:(E)SP = locked protected mode API stack
    interrupts disabled
Return: (with IRET)
    ES:(E)DI = selector:offset of real mode call structure to restore
--------E-310304-----------------------------
INT 31 P - DPMI 0.9+ - FREE REAL MODE CALLBACK ADDRESS
    AX = 0304h
    CX:DX = real mode callback address
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8024h) (see #03143)
Note:    the limited DPMI host built into Phar Lap's 286|DOS-Extender v2.5 does
      not support this function
SeeAlso: AX=0303h
--------E-310305-----------------------------
INT 31 P - DPMI 0.9+ - GET STATE SAVE/RESTORE ADDRESSES
    AX = 0305h
Return: CF clear
    AX = size in bytes of state buffer
    BX:CX = real mode address of procedure to save/restore state
    SI:(E)DI = protected mode procedure to save/restore state (see #03150)
Notes:    the buffer size will be zero if it is not necessary to preserve state
    16-bit programs should call SI:DI, 32-bit programs should call SI:EDI
    this function is only needed if using the raw mode switch service
SeeAlso: AX=0306h

(Table 03150)
Call DPMI state-save procedures with:
    AL = direction
        00h save state
        01h restore state
    ES:(E)DI -> state buffer
Return: all registers preserved
--------E-310306-----------------------------
INT 31 P - DPMI 0.9+ - GET RAW MODE SWITCH ADDRESSES
    AX = 0306h
Return: CF clear
    BX:CX -> procedure to switch from real to protected mode (see #03151)
    SI:(E)DI -> procedure to switch from protected to real mode
Notes:    16-bit programs should jump to SI:DI, 32-bit programs should use SI:EDI
    the caller must save and restore the state of the task with AX=0305h
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0305h

(Table 03151)
Values to JUMP at mode-switch procedures with:
    AX = new DS
    CX = new ES
    DX = new SS
    (E)BX = new (E)SP
    SI:(E)DI = new CS:(E)IP
Notes:    BP/EBP is preserved across the call, but AX/EAX, BX/EBX, CX/ECX,
      DX/EDX, SI/ESI, and DI/EDI will be undefined; FS and GS will be 0000h
    interrupts will stay disabled during the entire mode switch if they
      are disabled on entry to the mode-switch procedure
--------E-310400-----------------------------
INT 31 P - DPMI 0.9+ - GET DPMI VERSION
    AX = 0400h
Return: CF clear
    AH = major version of DPMI spec supported
    AL = two-digit minor version of DPMI spec supported
    BX = DPMI host flags (see #03152)
    CL = processor type (02h=80286, 03h=80386, 04h=80486)
    DH = curr value of virtual master interrupt controller base interrupt
    DL = curr value of virtual slave interrupt controller base interrupt
BUG:    Windows NT versions from the March 1993 beta to at least the Final
      release with fixes to CSD002 report version 0090h (0.144); this has
      reportedly been corrected in the Windows NT 3.5 beta
SeeAlso: AX=0401h,INT 21/AX=250Ch,INT 2F/AX=1687h,INT 4B/AX=8102h/DX=0000h
SeeAlso: INT 67/AX=DE0Ah

Bitfields for DPMI host flags:
Bit(s)    Description    (Table 03152)
 0    running under an 80386 (32-bit) implementation
 1    processor returns to real mode for reflected interrupts instead of V86
      mode
 2    virtual memory supported
 3    reserved (undefined)
 4-15    reserved (zero)
--------E-310401-----------------------------
INT 31 P - DPMI 1.0+ - GET DPMI CAPABILITIES
    AX = 0401h
    ES:(E)DI -> 128-byte buffer for host description (see #03153)
Return: CF clear if successful
        AX = capabilities (see #03154)
        CX = reserved (00h)
        DX = reserved (00h)
        buffer filled
    CF set on error (DPMI 0.9 only)
SeeAlso: AX=0400h

Format of DPMI host description:
Offset    Size    Description    (Table 03153)
 00h    BYTE    host major version number
 01h    BYTE    host minor version number
 02h 126 BYTEs    ASCIZ host vendor name

Bitfields for DPMI capabilities:
Bit(s)    Description    (Table 03154)
 0    paged accessed/dirty supported (see AX=0506h,AX=0507h)
 1    exceptions restartability supported
 2    device mapping supported (see AX=0508h)
 3    conventional memory mapping supported (see AX=0509h)
 4    demand zero-fill supported
 5    write-protect client capability supported
 6    write-protect host capability supported
 7-15    reserved
--------E-310500-----------------------------
INT 31 P - DPMI 0.9+ - GET FREE MEMORY INFORMATION
    AX = 0500h
    ES:(E)DI -> buffer for memory information (see #03155)
Return: CF clear
Notes:    16-bit programs use ES:DI, 32-bit programs use ES:EDI
    this function must be considered advisory because other applications
      may affect the results at any time after the call
    fields not supported by the DPMI implementation are filled with
      FFFFFFFFh
    DPMI 1.0+ supports this function solely for backward compatibility; use
      AX=050Bh instead
    the limited DPMI host built into Phar Lap's 286|DOS-Extender v2.5 only
      returns the first field in the memory information record
SeeAlso: AX=0501h,AX=050Bh,AX=0604h

Format of DPMI memory information:
Offset    Size    Description    (Table 03155)
 00h    DWORD    largest available block in bytes
 04h    DWORD    maximum unlocked page allocation
 08h    DWORD    maximum locked page allocation
 0Ch    DWORD    total linear address space in pages
 10h    DWORD    total unlocked pages
 14h    DWORD    free pages
 18h    DWORD    total physical pages
 1Ch    DWORD    free linear address space in pages
 20h    DWORD    size of paging file/partition in pages
 24h 12 BYTEs    reserved
--------E-310501-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE MEMORY BLOCK
    AX = 0501h
    BX:CX = size in bytes
Return: CF clear if successful
        BX:CX = linear address of block
        SI:DI = memory block handle for resizing and freeing block
    CF set on error
        AX = error code (DPMI 1.0+) (8012h-8014h,8016h,8021h)(see #03143)
Notes:    no selectors are allocated
    the memory block is allocated unlocked (can be locked with AX=0600h)
    allocations are often page granular (see AX=0604h)
    under MS Windows 3.10 Enhanced mode with paging enabled, it is possible
      for this function to fail even if AX=0500h indicates that enough
      memory is available
SeeAlso: AX=0000h,AX=0100h,AX=0500h,AX=0502h,AX=0503h,AX=0504h,AX=0D00h
SeeAlso: INT 2F/AX=FB42h/BX=0002h
--------E-310502-----------------------------
INT 31 P - DPMI 0.9+ - FREE MEMORY BLOCK
    AX = 0502h
    SI:DI = handle of memory block
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8023h) (see #03143)
Note:    any selectors allocated for the memory block must also be freed,
      preferably before freeing the memory block
SeeAlso: AX=0001h,AX=0101h,AX=0501h,AX=0D01h
--------E-310503-----------------------------
INT 31 P - DPMI 0.9+ - RESIZE MEMORY BLOCK
    AX = 0503h
    BX:CX = new size in bytes (nonzero)
    SI:DI = handle of memory block
Return: CF clear if successful
        BX:CX = new linear address
        SI:DI = new handle of memory block
    CF set on error
        AX = error code (DPMI 1.0+) (8012h-8014h,8016h,8021h,8023h)
        (see #03143)
Notes:    any selectors pointing at the block must be updated
    the previous memory block handle becomes invalid
    an error is returned if the new size is 0
SeeAlso: AX=0102h,AX=0501h,AX=0505h
--------E-310504-----------------------------
INT 31 P - DPMI 1.0+ - ALLOCATE LINEAR MEMORY BLOCK
    AX = 0504h
    EBX = page-aligned linear address of memory block (00000000h if any
          address is acceptable)
    ECX = size in bytes (nonzero)
    EDX = flags
        bit 0: set to create committed pages instead of uncommitted pages
        bits 1-31 reserved (0)
Return: CF clear if successful
        EBX = linear address of memory block
        ESI = memory block handle
    CF set on error
        AX = error code (8001h,8012h-8014h,8016h,8021h,8025h)(see #03143)
Note:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
SeeAlso: AX=0501h,AX=0505h
--------E-310505-----------------------------
INT 31 P - DPMI 1.0+ - RESIZE LINEAR MEMORY BLOCK
    AX = 0505h
    ESI = memory block handle
    ECX = new size in bytes (nonzero)
    EDX = flags
        bit 0: create committed pages rather than uncommitted pages
        bit 1: segment descriptor update required
        ES:EBX -> buffer containing array of WORDs with selectors
        EDI = number of selectors in array
        bits 2-31 reserved (0)
Return: CF clear if successful
        EBX = new linear base address
        ESI = new memory block handle
    CF set on error
        AX = error code (8001h,8012h-8014h,8016h,8021h,8023h)(see #03143)
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    the old memory block handle becomes invalid
    if EDX bit 1 set and the block's base address is changed, DPMI updates
      all descriptors for selectors in the update buffer which fall within
      the memory block
SeeAlso: AX=0503h,AX=0504h
--------E-310506-----------------------------
INT 31 P - DPMI 1.0+ - GET PAGE ATTRIBUTES
    AX = 0506h
    ESI = memory block handle
    EBX = offset in memory block of first page
    ECX = number of pages
    ES:EDX -> array of WORDs to hold page attributes (see #03156)
Return: CF clear if successful
        buffer filled
    CF set on error
        AX = error code (8001h,8023h,8025h) (see #03143)
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    if EBX is not page-aligned, it will be rounded down
SeeAlso: AX=0504h,AX=0507h,INT 21/AX=251Dh,INT 21/AX=EB00h

Bitfields for DPMI page attribute word:
Bit(s)    Description    (Table 03156)
 0-2    page type
    000 uncommitted
    001 committed
    010 mapped (see AX=0508h,AX=0509h)
    other currently unused
 3    page is read/write rather than read-only
 4    accessed/dirty bits supplied in bits 5 and 6
 5    page has been accessed (only valid if bit 4 set)
 6    page has been written (only valid if bit 4 set)
 7-15    reserved (0)
--------E-310507-----------------------------
INT 31 P - DPMI 1.0+ - MODIFY PAGE ATTRIBUTES
    AX = 0507h
    ESI = memory block handle
    EBX = offset in memory block of first page
    ECX = number of pages
    ES:EDX -> array of WORDs with new page attributes (see #03156)
Return: CF clear if successful
    CF set on error
        AX = error code (8001h,8002h,8013h,8014h,8021h,8023h,8025h)
        (see #03143)
        ECX = number of pages which have been set
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    if EBX is not page-aligned, it will be rounded down
SeeAlso: AX=0504h,AX=0506h,INT 21/AX=251Eh
--------E-310508-----------------------------
INT 31 P - DPMI 1.0+ - MAP DEVICE IN MEMORY BLOCK
    AX = 0508h
    ESI = memory block handle
    EBX = page-aligned offset within memory block of page(s) to be mapped
    ECX = number of pages to map
    EDX = page-aligned physical address of device
Return: CF clear if successful
    CF set on error
        AX = error code (8001h,8003h,8023h,8025h) (see #03143)
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    support of this function is optional; hosts are also allowed to support
      the function for some devices but not others
SeeAlso: AX=0504h,AX=0509h,AX=0800h,AX=0801h
--------E-310509-----------------------------
INT 31 P - DPMI 1.0+ - MAP CONVENTIONAL MEMORY IN MEMORY BLOCK
    AX = 0509h
    ESI = memory block handle
    EBX = page-aligned offset within memory block of page(s) to map
    ECX = number of pages to map
    EDX = page-aligned linear address of conventional (below 1M) memory
Return: CF clear if successful
    CF set on error
        AX = error code (8001h,8003h,8023h,8025h) (see #03143)
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    support of this function is optional
SeeAlso: AX=0504h,AX=0508h,AX=0801h
--------E-31050A-----------------------------
INT 31 P - DPMI 1.0+ - GET MEMORY BLOCK SIZE AND BASE
    AX = 050Ah
    SI:DI = memory block handle
Return: CF clear if successful
        SI:DI = size in bytes
        BX:CX = base address
    CF set on error
        AX = error code (8023h) (see #03143)
SeeAlso: AX=0501h,AX=0504h
--------E-31050B-----------------------------
INT 31 P - DPMI 1.0+ - GET MEMORY INFORMATION
    AX = 050Bh
    ES:(E)DI -> 128-byte buffer for memory information (see #03157)
Return: CF clear if successful
    CF set on error (DPMI 0.9 only)
Note:    16-bit programs use ES:DI, 32-bit programs must use ES:EDI
SeeAlso: AX=0500h

Format of DPMI memory information:
Offset    Size    Description    (Table 03157)
 00h    DWORD    total allocated bytes of physical memory controlled by host
 04h    DWORD    total allocated bytes of virtual memory controlled by host
 08h    DWORD    total available bytes of virtual memory controlled by host
 0Ch    DWORD    total allocated bytes of virtual memory for curr virtual mach
 10h    DWORD    total available bytes of virtual memory for curr virtual mach
 14h    DWORD    total allocated bytes of virtual memory for current client
 18h    DWORD    total available bytes of virtual memory for current client
 1Ch    DWORD    total locked bytes for current client
 20h    DWORD    maximum locked bytes for current client
 24h    DWORD    highest linear address available to current client
 28h    DWORD    largest available memory block in bytes
 2Ch    DWORD    minimum allocation unit in bytes
 30h    DWORD    allocation alignment unit size in bytes
 34h 76 BYTEs    reserved (00h)
--------E-310600-----------------------------
INT 31 P - DPMI 0.9+ - LOCK LINEAR REGION
    AX = 0600h
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
        none of the memory is locked
        AX = error code (DPMI 1.0+) (8013h,8017h,8025h) (see #03143)
Notes:    pages at beginning and end will be locked if the region overlaps them
    may be called multiple times for a given page; the DPMI host keeps a
      lock count for each page
SeeAlso: AX=0004h,AX=0601h,INT 21/AX=251Ah,INT 21/AX=EB06h
--------E-310601-----------------------------
INT 31 P - DPMI 0.9+ - UNLOCK LINEAR REGION
    AX = 0601h
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
        none of the memory is unlocked
        AX = error code (DPMI 1.0+) (8002h,8025h) (see #03143)
Notes:    pages at beginning and end will be unlocked if the region overlaps them
    memory whose lock count has not reached zero remains locked
SeeAlso: AX=0005h,AX=0600h,INT 21/AX=251Bh,INT 21/AX=EB07h
--------E-310602-----------------------------
INT 31 P - DPMI 0.9+ - MARK REAL MODE REGION AS PAGEABLE
    AX = 0602h
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
        none of the memory is made pageable
        AX = error code (DPMI 1.0+) (8002h,8025h) (see #03143)
Notes:    must relock all unlocked real mode memory before terminating process
      for DPMI 0.9; DPMI 1.0+ automatically relocks real mode memory
    pages at beginning and end will be unlocked if the region overlaps them
    pageability of real mode pages is binary, not a count
SeeAlso: AX=0600h,AX=0603h
--------E-310603-----------------------------
INT 31 P - DPMI 0.9+ - RELOCK REAL MODE REGION
    AX = 0603h
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
        none of the memory is relocked
        AX = error code (DPMI 1.0+) (8002h,8013h,8025h) (see #03143)
Notes:    pages at beginning and end will be relocked if the region overlaps them
    pageability of real mode pages is binary, not a count
SeeAlso: AX=0602h
--------E-310604-----------------------------
INT 31 P - DPMI 0.9+ - GET PAGE SIZE
    AX = 0604h
Return: CF clear if successful
        BX:CX = page size in bytes
    CF set on error
        AX = error code (DPMI 1.0+) (see also #03143)
        8001h unsupported, 16-bit host
BUG:    the Borland C++ 3.1 DPMILOAD returns with CF clear but BX and CX
      unchanged
--------E-310700-----------------------------
INT 31 Pu - DPMI 0.9+ - MARK PAGES AS PAGING CANDIDATES
    AX = 0700h
    BX:CX = starting linear page number
    SI:DI = number of pages to mark as paging candidates
Return: ???
Note:    although marked as reserved in versions 0.9 and 1.0 of the DPMI
      specification, this function is called by MS Windows TASKMAN,
      PROGMAN, and KERNEL
SeeAlso: AX=0701h,AX=0702h
--------E-310701-----------------------------
INT 31 Pu - DPMI 0.9+ - DISCARD PAGES
    AX = 0701h
    BX:CX = starting linear page number
    SI:DI = number of pages to discard
Return: ???
Note:    although marked as reserved in versions 0.9 and 1.0 of the DPMI
      specification, this function is called by MS Windows TASKMAN,
      PROGMAN, and KERNEL
SeeAlso: AX=0700h,AX=0703h
--------E-310702-----------------------------
INT 31 P - DPMI 0.9+ - MARK PAGE AS DEMAND PAGING CANDIDATE
    AX = 0702h
    BX:CX = starting linear address
    SI:DI = number of bytes to mark as paging candidates
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8025h) (see #03143)
Notes:    this function is advisory, and does not force immediate paging
    partial pages will not be discarded
SeeAlso: AX=0700h,AX=0703h
--------E-310703-----------------------------
INT 31 P - DPMI 0.9+ - DISCARD PAGE CONTENTS
    AX = 0703h
    BX:CX = starting linear address
    SI:DI = number of bytes to mark as discarded
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8025h) (see #03143)
Notes:    this function is advisory, and may be ignored by DPMI implementations
    partial pages will not be discarded
SeeAlso: AX=0701h,AX=0702h
--------E-310800-----------------------------
INT 31 P - DPMI 0.9+ - PHYSICAL ADDRESS MAPPING
    AX = 0800h
    BX:CX = physical address (should be above 1 MB)
    SI:DI = size in bytes
Return: CF clear if successful
        BX:CX = linear address which maps the requested physical memory
    CF set on error
        AX = error code (DPMI 1.0+) (8003h,8021h) (see #03143)
Notes:    implementations may refuse this call because it can circumvent protects
    the caller must build an appropriate selector for the memory
    do not use for memory mapped in the first megabyte
SeeAlso: AX=0002h,AX=0508h,AX=0509h,AX=0801h,INT 21/AX=250Ah,INT 21/AX=EB05h
--------E-310801-----------------------------
INT 31 P - DPMI 1.0+ - FREE PHYSICAL ADDRESS MAPPING
    AX = 0801h
    BX:CX = linear address returned by AX=0800h
Return: CF clear if successful
    CF set on error
        AX = error code (8025h) (see #03143)
Note:    should be called at end of access to device mapped with AX=0800h
SeeAlso: AX=0508h,AX=0509h,AX=0800h,INT 21/AX=EB03h
--------E-310900-----------------------------
INT 31 P - DPMI 0.9+ - GET AND DISABLE VIRTUAL INTERRUPT STATE
    AX = 0900h
Return: CF clear
    virtual interrupts disabled
    AL = previous interrupt state (00h disabled, 01h enabled)
    AH preserved
Notes:    the previous state may be restored simply by executing another INT 31
    a CLI instruction may be used if the previous state is unimportant,
      but should be assumed to be very slow due to trapping by the host
SeeAlso: AX=0901h,AX=0902h
--------E-310901-----------------------------
INT 31 P - DPMI 0.9+ - GET AND ENABLE VIRTUAL INTERRUPT STATE
    AX = 0901h
Return: CF clear
    virtual interrupts enabled
    AL = previous interrupt state (00h disabled, 01h enabled)
    AH preserved
Notes:    the previous state may be restored simply by executing another INT 31
    a STI instruction may be used if the previous state is unimportant,
      but should be assumed to be very slow due to trapping by the host
SeeAlso: AX=0900h,AX=0902h
--------E-310902-----------------------------
INT 31 P - DPMI 0.9+ - GET VIRTUAL INTERRUPT STATE
    AX = 0902h
Return: CF clear
    AL = current interrupt state (00h disabled, 01h enabled)
Note:    should be used rather than PUSHF because that instruction yields the
      physical interrupt state rather than the per-client virtualized
      interrupt flag
SeeAlso: AX=0900h,AX=0901h
--------E-310A00-----------------------------
INT 31 P - DPMI 0.9+ - GET VENDOR SPECIFIC API ENTRY POINT
    AX = 0A00h
    DS:(E)SI -> case-sensitive ASCIZ vendor name or identifier
Return: CF clear if successful
        ES:(E)DI -> FAR extended API entry point
        DS, FS, GS, EAX, EBX, ECX, EDX, ESI, EBP destroyed
    CF set on error
        AX = error code (DPMI 1.0+) (8001h) (see #03143)
Notes:    extended API parameters are vendor-specific
    DPMI 1.0+ supports this function solely for backward compatibility; use
      INT 2F/AX=168Ah instead
    this function is not supported by MS Windows 3.10, BC++ 3.1 DPMILOAD,
      or QDPMI v1.0x; use INT 2F/AX=168Ah instead.    It is supported by
      386MAX v7.01.
SeeAlso: INT 2F/AX=168Ah
--------E-310B00-----------------------------
INT 31 P - DPMI 0.9+ - SET DEBUG WATCHPOINT
    AX = 0B00h
    BX:CX = linear address
    DL = size (1,2,4 bytes)
    DH = type (00h execute, 01h write, 02h read/write)
Return: CF clear if successful
        BX = watchpoint handle
    CF set on error
        AX = error code (DPMI 1.0+) (8016h,8021h,8025h) (see #03143)
SeeAlso: AX=0212h,AX=0601h
--------E-310B01-----------------------------
INT 31 P - DPMI 0.9+ - CLEAR DEBUG WATCHPOINT
    AX = 0B01h
    BX = watchpoint handle
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8023h) (see #03143)
Note:    the watchpoint handle is freed
SeeAlso: AX=0B00h
--------E-310B02-----------------------------
INT 31 P - DPMI 0.9+ - GET STATE OF DEBUG WATCHPOINT
    AX = 0B02h
    BX = watchpoint handle
Return: CF clear if successful
        AX = status flags
        bit 0: watch point has been executed since AX=0B00h or AX=0B03h
    CF set on error
        AX = error code (DPMI 1.0+) (8023h) (see #03143)
SeeAlso: AX=0B00h,AX=0B03h
--------E-310B03-----------------------------
INT 31 P - DPMI 0.9+ - RESET DEBUG WATCHPOINT
    AX = 0B03h
    BX = watchpoint handle
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8023h) (see #03143)
SeeAlso: AX=0B02h
--------E-310C00-----------------------------
INT 31 P - DPMI 1.0+ - INSTALL RESIDENT HANDLER INIT CALLBACK
    AX = 0C00h
    ES:(E)DI -> resident service provider structure (see #03158)
Return: CF clear if successful
    CF set on error
        AX = error code (8015h,8021h,8025h) (see #03143 at AX=0000h)
Note:    calling this function declares an intent to provide resident
      protected mode services after terminating with AX=0C01h
SeeAlso: AX=0303h,AX=0C01h

Format of DPMI resident service provider structure:
Offset    Size    Description    (Table 03158)
 00h    QWORD    descriptor for 16-bit data segment
 08h    QWORD    descriptor for 16-bit code segment (zeros if not supported)
 10h    WORD    offset of 16-bit callback procedure
 12h  2 BYTEs    reserved
 14h    QWORD    descriptor for 32-bit data segment
 1Ch    QWORD    descriptor for 32-bit code segment (zeros if not supported)
 24h    DWORD    offset of 32-bit callback procedure
--------E-310C01-----------------------------
INT 31 P - DPMI 1.0+ - TERMINATE AND STAY RESIDENT
    AX = 0C01h
    BL = return code
    DX = number of paragraphs of DOS memory to reserve (0 or >= 6)
Return: never
Notes:    should only be used if the program will only provide services to
      other DPMI programs
    any protected mode memory remains allocated to the program unless
      explicitly freed before this call
    must first call AX=0C00h or program will simply be terminated
SeeAlso: AX=0C00h,INT 21/AH=31h
--------E-310D00-----------------------------
INT 31 P - DPMI 1.0+ - ALLOCATE SHARED MEMORY
    AX = 0D00h
    ES:(E)DI -> shared memory allocation request structure (see #03159)
Return: CF clear if successful
        request structure updated
    CF set on error
        AX = error code (8012h,8013h,8014h,8016h,8021h) (see #03143)
Note:    first 16 bytes of memory block will be initialized to zeros on the
      first allocation
SeeAlso: AX=0501h,AX=0D01h,AX=0D02h

Format of DPMI shared memory allocation request structure:
Offset    Size    Description    (Table 03159)
 00h    DWORD    requested length of shared memory block in bytes
 04h    DWORD    (ret) allocated length of block
 08h    DWORD    (ret) shared memory handle
 0Ch    DWORD    (ret) linear address of memory block
 10h    PWORD    selector:offset32 of ASCIZ name for memory block
        (name max 128 bytes)
 16h  2 BYTEs    reserved
 18h  4 BYTEs    reserved (00h)
--------E-310D01-----------------------------
INT 31 P - DPMI 1.0+ - FREE SHARED MEMORY
    AX = 0D01h
    SI:DI = shared memory block handle
Return: CF clear if successful
    CF set on error
        AX = error code (8023h) (see #03143)
Notes:    handle becomes invalid after this call
    DPMI maintains separate global and virtual machine use counts for each
      shared memory block; when the global use counts reaches zero, the
      block is finally destroyed
SeeAlso: AX=0502h,AX=0D00h
--------E-310D02-----------------------------
INT 31 P - DPMI 1.0+ - SERIALIZE SHARED MEMORY
    AX = 0D02h
    SI:DI = shared memory block handle
    DX = flags
        bit 0: return immediately rather than suspending if serialization
          unavailable
        bit 1: shared rather than exclusive serialization
        bits 2-15 reserved (0)
Return: CF clear if successful
    CF set on error
        AX = error code (8004h,8005h,8017h-8019h,8023h) (see #03143)
Notes:    an exclusive serialization blocks any other serialization attempts for
      the same block by another virtual machine; a shared serialization
      blocks attempts at exclusive serialization by another virtual machine
    hosts are not required to detect deadlock
    a client's interrupt handler can cancel a serialization call which
      caused it to block by calling AX=0D03h
SeeAlso: AX=0D00h,AX=0D03h
--------E-310D03-----------------------------
INT 31 P - DPMI 1.0+ - FREE SERIALIZATION ON SHARED MEMORY
    AX = 0D03h
    SI:DI = shared memory block handle
    DX = flags
        bit 0: release shared serialization rather than exclusive serialztn
        bit 1: free pending serialization
        bits 2-15 reserved (0)
Return: CF clear if successful
    CF set on error
        AX = error code (8002h,8023h) (see #03143 at AX=0000h)
SeeAlso: AX=0D00h,AX=0D02h
--------E-310E00-----------------------------
INT 31 P - DPMI 1.0+ - GET COPROCESSOR STATUS
    AX = 0E00h
Return: CF clear
    AX = coprocessor status (see #03160)
Note:    supported by 386MAX v6.01, which otherwise only supports DPMI 0.9
SeeAlso: AX=0E01h

Bitfields for DPMI coprocessor status:
Bit(s)    Description    (Table 03160)
 0    numeric coprocessor enabled for current client
 1    client is emulating coprocessor
 2    numeric coprocessor is present
 3    host is emulating coprocessor instructions
 4-7    coprocessor type
    0000 none
    0010 80287
    0011 80387
    0100 80486 with numeric coprocessor
    other reserved
 8-15    not used
--------E-310E01-----------------------------
INT 31 P - DPMI 1.0+ - SET EMULATION
    AX = 0E01h
    BX = coprocessor flag bits (see #03161)
Return: CF clear if successful
    CF set on error
        AX = error code (8026h) (see #03143 at AX=0000h)
Note:    supported by 386MAX v6.01, which otherwise only supports DPMI 0.9
SeeAlso: AX=0E00h

Bitfields for DPMI coprocessor flags:
Bit(s)    Description    (Table 03161)
 0    enable numeric coprocessor for current client
 1    client will emulate coprocessor
 2-15    not used
--------E-3157-------------------------------
INT 31 - Netroom3 DPMI.EXE v3.00 - ???
    AH = 57h
    AL = subfunction (at least 02h,03h,04h,05h,07h,08h,09h,0Ah)
    ???
Return: ???
SeeAlso: INT 2C/AX=0000h"Cloaking"
--------E-315702-----------------------------
INT 31 - Netroom3 DPMI.EXE v3.00 - SWITCH TO PROTECTED MODE
    AX = 5702h
    DX = PSP segment of caller
    STACK: WORD    ???
           WORD    flags (bit 0 set if 32-bit program)
Return: as for DPMI mode-switch entry point (see #02718 at INT 2F/AX=1687h)
Note:    this function is called by the real-mode DPMI mode-switch entry point
SeeAlso: INT 2F/AX=1687h
--------E-31EE00------------------------
INT 31 - DOS32 v3.0+ - GET DOS32 VERSION AND SELECTOR VALUES
    AX = EE00h
Return: AL = minor version (BCD)
    AH = major version (BCD)
    DL = system type (1=raw DOS, 2=XMS, 4=VCPI, 8=DPMI)
    BX = selector of 4GB data segment with zero base address
Program: DOS32 is a 32 bit DOS extender by Adam Seychell.
SeeAlso: AX=EE02h
--------E-31EE02------------------------
INT 31 - DOS32 v3.0+ - GET DOS32 ADDRESS INFORMATION
    AX = EE02h
Return: AX = real-mode segment of temporary 8K buffer (v3.1+)
    EBX = 32bit linear address of the program segment
    EDX = Total size in bytes of the programs .EXE file after linking.
    ESI = offset address of PSP
    EDI = offset address of program environment
    ECX = offset address of the program's .EXE ASCIZ file name and path
SeeAlso: AX=EE00h,AX=EE20h
--------E-31EE10------------------------
INT 31 - DOS32 v3.2+ - SET UP A DOS32 LOADABLE LIBRARY
    AX = EE10h
    EDX -> library ASCIZ path\filename
    EBX = number of bytes to seek from beginning of file
Return: CF clear if successful
        EAX = size of memory block required to store library
        EBX = size of library file
    CF set on error
        AL = error code.
        01h error opening or reading file
        02h bad DOS32 library file
SeeAlso: AX=EE00h,AX=EE11h
--------E-31EE11------------------------
INT 31 - DOS32 v3.2+ - LOAD LIBRARY FILE
    AX = EE11h
    EDX -> near pointer of memory block to store library
Return: CF clear if successful
        EDX = near pointer to the dynamic library public
    CF set on error
Note:    must first successfuly call function AX=EE10h before calling this
      function
SeeAlso: AX=EE00h,AX=EE10h
--------E-31EE20------------------------
INT 31 - DOS32 v3.0+ - GET REAL MODE CALL BACK ADDRESS WITH RETF STACK FRAME
    AX = EE20h
    ESI = offset of the real mode call back function
Return: CF clear if successful
        CX:DX = real mode address to call up to the protected mode
          procedure
    CF set on error
SeeAlso: AX=EE00h,AX=EE02h,AX=EE21h
--------E-31EE21------------------------
INT 31 - DOS32 v3.0+ - GET REAL MODE CALL BACK ADDRESS WITH IRET STACK FRAME
    AX = EE21h
    ESI = offset of the real mode call back function
Return: CF clear if successful
        CX:DX = real mode address to call up to the protected mode
          procedure
    CF set on error
SeeAlso: AX=EE20h
--------E-31EE30------------------------
INT 31 - DOS32 v3.0+ - TERMINATE AND STAY RESIDENT
    AX = EE30h
SeeAlso: AX=EE21h,AX=EE40h,INT 21/AH=31h
--------E-31EE40------------------------
INT 31 - DOS32 v3.0+ - UNDO PREVIOUS MEMORY ALLOCATION or DMA BUFFER
    AX = EE40h
Return: CF clear if successful
    CF set on error
SeeAlso: AX=EE41h,AX=EE42h
--------E-31EE41------------------------
INT 31 - DOS32 v3.0+ - ALLOCATE 16KB DMA BLOCK
    AX = EE41h
Return: CF clear if successful
        EBX -> 16KB DMA block (physical address)
        EDX -> 16KB DMA block (offset address)
    CF set on error
SeeAlso: AX=EE40h,AX=EE42h
--------E-31EE42------------------------
INT 31 - DOS32 v3.0+ - ALLOCATE MEMORY BLOCK
    AX = EE42h
    EDX = size in bytes
Return: CF clear if successful
        EAX = size in bytes
        EDX -> memory block
    CF set on error
Note:    size is rounded off to the next 4KB boundary
SeeAlso: AX=EE40h,AX=EE41h
--------E-31FF00-----------------------------
INT 31 P - CauseWay - "Info" - GET SYSTEM SELECTORS/FLAGS
    AX = FF00h
Return: AX = selector for flag address space (base 00000000h, limit 4GB)
    BX = selector for current PSP segment (limit 0100h)
    (E)CX = size of DOS transfer buffer (max 64K)
    DX = real-mode segment address of DOS transfer buffer
    ES:(E)SI = protected-mode address of DOS transfer buffer
    EDI = system flags (see #03162)
Program: CauseWay is a 386 DOS extender by Michael Devore and John Wildsmith
      for use with Watcom C++ or assembly language programs
Notes:    the entire transfer buffer can be addressed with a 16-bit offset in
      protected mode
    CauseWay always maps selector 0040h to the BIOS data segment at
      real-mode segment 0040h; when not running under a DPMI host, CauseWay
      also provides selectors A000h, B000h, and B800h mapped to video
      memory
SeeAlso: AX=FF25h

Bitfields for CauseWay system flags:
Bit(s)    Description    (Table 03162)
 0    32-bit code
 1    virtual memory manage enabled
 3-2    mode: 00 raw extended memory, 01 VCPI, 10 DPMI
 4    DPMI available
 5    VCPI available
 6    no memory managers
 7    application descriptor table type: 0 = GDT, 1 = LDT
 14-8    reserved
 15    debugging engine present
--------E-31FF01-----------------------------
INT 31 P - CauseWay - "IntXX" - SIMULATE REAL-MODE INTERRUPT
    AX = FF01h
    BL = interrupt number
    ES:(E)DI -> real-mode register list (see #03148 at AX=0300h)
Return: register list updated
Note:    CauseWay fills in the values for SS, SP, and FLAGS itself, and ignores
      the values specified for CS and IP
SeeAlso: AX=0300h,AX=FF02h
--------E-31FF02-----------------------------
INT 31 P - CauseWay - "FarCallReal" - SIMULATE REAL-MODE FAR CALL
    AX = FF02h
    ES:(E)DI -> real-mode register list (see #03148 at AX=0300h)
Return: register list updated
SeeAlso: AX=0301h,AX=FF01h
--------E-31FF03-----------------------------
INT 31 P - CauseWay - "GetSel" - ALLOCATE NEW SELECTOR
    AX = FF03h
Return: CF clear if successful
        BX = new selector
    CF set on error
Note:    the new selector is initialized with a base address of 000000h, a limit
      of 0000h, and attributes read/write expand-up data
SeeAlso: AX=FF04h,AX=FF05h,AX=FF06h
--------E-31FF04-----------------------------
INT 31 P - CauseWay - "RelSel" - RELEASE A SELECTOR
    AX = FF04h
    BX = selector
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF03h,AX=FF06h
--------E-31FF05-----------------------------
INT 31 P - CauseWay - "CodeSel" - CONVERT SELECTOR TO EXECUTABLE CODE SELECTOR
    AX = FF05h
    BX = selector
    CL = default operation size (00h = 16-bit, 01h = 32-bit)
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF03h
--------E-31FF06-----------------------------
INT 31 P - CauseWay - "AliasSel" - CREATE READ/WRITE DATA ALIAS SELECTOR
    AX = FF06h
    BX = original selector
Return: CF clear if successful
        AX = new data selector aliasing original selector
    CF set on error
SeeAlso: AX=FF03h,AX=FF04h
--------E-31FF07-----------------------------
INT 31 P - CauseWay - "GetSelDet" - GET SELECTOR BASE AND LIMIT
    AX = FF07h
    BX = selector
Return: CF clear if successful
        CX:DX = base address
        SI:DI = limit (bytes)
    CF set on error
SeeAlso: AX=FF08h,AX=FF09h
--------E-31FF08-----------------------------
INT 31 P - CauseWay - "GetSelDet32" - GET SELECTOR BASE AND LIMIT (32-bit)
    AX = FF08h
Return: CF clear if successful
        EDX = base address
        ECX = limit (bytes)
    CF set on error
SeeAlso: AX=FF07h,AX=FF0Ah
--------E-31FF09-----------------------------
INT 31 P - CauseWay - "SetSelDet" - SET SELECTOR BASE AND LIMIT
    AX = FF09h
    BX = selector
    CX:DX = new base address
    SI:DI = new byte-granular limit
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF07h,AX=FF0Ah
--------E-31FF0A-----------------------------
INT 31 P - CauseWay - "SetSelDet32" - SET SELECTOR BASE AND LIMIT (32-bit)
    AX = FF0Ah
    BX = selector
    EDX = new base address
    ECX = new byte-granular limit
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF08h,AX=FF09h
--------E-31FF0B-----------------------------
INT 31 P - CauseWay - "GetMem" - ALLOCATE BLOCK OF MEMORY
    AX = FF0Bh
    CX:DX = size in bytes (FFFFh:FFFFh to get size of largest available)
Return: CF clear if successful
        BX = selector for accessing block if requested size not FFFFh:FFFFh
        CX:DX = size of largest available block if requested FFFFh:FFFFh
    CF set on error
SeeAlso: AX=FF0Ch,AX=FF0Dh,AX=FF0Fh,AX=FF10h,AX=FF2Ch
--------E-31FF0C-----------------------------
INT 31 P - CauseWay - "GetMem32" - ALLOCATE BLOCK OF MEMORY (32-bit)
    AX = FF0Ch
    ECX = size in bytes (FFFFFFFFh to get size of largest available block)
Return: CF clear if successful
        BX = selector for accessing block if requested size not FFFFh:FFFFh
        ECX = size of largest available block if requested FFFFh:FFFFh
    CF set on error
SeeAlso: AX=FF0Bh,AX=FF0Eh,AX=FF0Fh,AX=FF11h
--------E-31FF0D-----------------------------
INT 31 P - CauseWay - "ResMem" - RESIZE MEMORY BLOCK
    AX = FF0Dh
    BX = selector for block to be resized
    CX:DX = new size in bytes
Return: CF clear if successful
    CF set on error
Note:    the memory block may have to be copied to another location in order
      to satisfy the requested new size, in which case the base address
      of the selector is updated
SeeAlso: AX=FF0Bh,AX=FF0Eh,AX=FF12h
--------E-31FF0E-----------------------------
INT 31 P - CauseWay - "ResMem32" - RESIZE MEMORY BLOCK (32-bit)
    AX = FF0Eh
    BX = selector for block to be resized
    ECX = new size in bytes
Return: CF clear if successful
    CF set on error
Note:    the memory block may have to be copied to another location in order
      to satisfy the requested new size, in which case the base address
      of the selector is updated
SeeAlso: AX=FF0Ch,AX=FF0Dh,AX=FF13h
--------E-31FF0F-----------------------------
INT 31 P - CauseWay - "RelMem" - RELEASE PREVIOUSLY ALLOCATED MEMORY
    AX = FF0Fh
    BX = selector for block to be released
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF0Bh,AX=FF0Ch,AX=FF14h
--------E-31FF10-----------------------------
INT 31 P - CauseWay - "GetMemLinear" - ALLOCATE MEMORY WITHOUT SELECTOR
    AX = FF10h
    CX:DX = size of block in bytes
Return: CF clear if successful
        SI:DI = linear address of allocated block
    CF set on error
Note:    this function may return addresses above 16M
SeeAlso: AX=FF0Bh,AX=FF11h,AX=FF12h,AX=FF14h
--------E-31FF11-----------------------------
INT 31 P - CauseWay - "GetMemLinear32" - ALLOCATE MEMORY WITHOUT SELECTOR
    AX = FF11h
    ECX = size of block in bytes
Return: CF clear if successful
        ESI = linear address of allocated block
    CF set on error
Note:    this function may return addresses above 16M
SeeAlso: AX=FF0Ch,AX=FF10h,AX=FF13h,AX=FF14h
--------E-31FF12-----------------------------
INT 31 P - CauseWay - "ResMemLinear" - RESIZE LINEAR MEMORY BLOCK
    AX = FF12h
    CX:DX = new size in bytes
    SI:DI = linear address of block to be resized
Return: CF clear if successful
       SI:DI = new linear address of block
    CF set on error
SeeAlso: AX=FF0Dh,AX=FF10h,AX=FF13h
--------E-31FF13-----------------------------
INT 31 P - CauseWay - "ResMemLinear32" - RESIZE LINEAR MEMORY BLOCK (32-bit)
    AX = FF13h
    ECX = new size in bytes
    ESI = linear address of block to be resized
Return: CF clear if successful
       ESI = new linear address of block
    CF set on error
SeeAlso: AX=FF0Eh,AX=FF11h,AX=FF12h
--------E-31FF14-----------------------------
INT 31 P - CauseWay - "RelMemLinear" - RELEASE LINEAR MEMORY BLOCK
    AX = FF14h
    SI:DI = linear address of block to be released
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF0Fh,AX=FF10h,AX=FF15h
--------E-31FF15-----------------------------
INT 31 P - CauseWay - "RelMemLinear32" - RELEASE LINEAR MEMORY BLOCK (32-bit)
    AX = FF15h
    ESI = linear address of block to be released
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF0Fh,AX=FF11h,AX=FF15h
--------E-31FF16-----------------------------
INT 31 P - CauseWay - "GetMemNear" - ALLOCATE APPLICATION-RELATIVE MEMORY
    AX = FF16h
    EBX = size in bytes of block to allocate
Return: CF clear if successful
       ESI = application-relative linear address of allocated block
    CF set on error
SeeAlso: AX=FF17h,AX=FF18h,AX=FF19h
--------E-31FF17-----------------------------
INT 31 P - CauseWay - "ResMemNear" - RESIZE APPLICATION-RELATIVE MEMORY BLOCK
    AX = FF17h
    EBX = size in bytes of block to allocate
    ESI = application-relative linear address of block
Return: CF clear if successful
        ESI = new application-relative linear address of block
    CF set on error
SeeAlso: AX=FF16h,AX=FF18h,AX=FF19h
--------E-31FF18-----------------------------
INT 31 P - CauseWay - "RelMemNear" - RELEASE APPLICATION-RELATIVE MEMORY BLOCK
    AX = FF18h
    ESI = application-relative linear address of block
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF16h,AX=FF17h,AX=FF19h
--------E-31FF19-----------------------------
INT 31 P - CauseWay - "Linear2Near" - CONVERT LINEAR TO APP-RELATIVE ADDRESS
    AX = FF19h
    ESI = linear address
Return: ESI = application-relative linear address
SeeAlso: AX=FF1Ah
--------E-31FF1A-----------------------------
INT 31 P - CauseWay - "Near2Linear" - CONVERT APP-RELATIVE TO LINEAR ADDRESS
    AX = FF1Ah
    ESI = application-relative linear address
Return: ESI = linear address
SeeAlso: AX=FF19h
--------E-31FF1B-----------------------------
INT 31 P - CauseWay - "LockMem" - LOCK REGION OF MEMORY
    AX = FF1Bh
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    prevent memory from being swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be locked as well
SeeAlso: AX=FF1Ch,AX=FF1Dh
--------E-31FF1C-----------------------------
INT 31 P - CauseWay - "LockMem32" - LOCK REGION OF MEMORY (32-bit)
    AX = FF1Ch
    ESI = starting linear address
    ECX = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    prevent memory from being swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be locked as well
SeeAlso: AX=FF1Bh,AX=FF1Eh,AX=FF1Fh
--------E-31FF1D-----------------------------
INT 31 P - CauseWay - "UnLockMem" - UNLOCK REGION OF MEMORY
    AX = FF1Dh
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    allow memory to be swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be unlocked as well
SeeAlso: AX=FF1Bh,AX=FF1Eh
--------E-31FF1E-----------------------------
INT 31 P - CauseWay - "UnLockMem32" - UNLOCK REGION OF MEMORY (32-bit)
    AX = FF1Eh
    ESI = starting linear address
    ECX = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    allow memory to be swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be unlocked as well
SeeAlso: AX=FF1Ch,AX=FF1Dh,AX=FF20h
--------E-31FF1F-----------------------------
INT 31 P - CauseWay - "LockMemNear" - LOCK APPLICATION-RELATIVE MEMORY REGION
    AX = FF1Fh
    ESI = starting application-relative linear address
    EBX = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    prevent memory from being swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be locked as well
SeeAlso: AX=FF1Ch,AX=FF20h
--------E-31FF20-----------------------------
INT 31 P - CauseWay - "UnLockMemNear" - UNLOCK APP-RELATIVE MEMORY REGION
    AX = FF20h
    ESI = starting application-relative linear address
    ECX = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    allow memory to be swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be unlocked as well
SeeAlso: AX=FF1Eh,AX=FF1Fh
--------E-31FF21-----------------------------
INT 31 P - CauseWay - "GetMemDOS" - ALLOCATE CONVENTIONAL MEMORY
    AX = FF21h
    BX = number of paragraphs to allocate
Return: CF clear if successful
        AX = real-mode segment of allocated block
        DX = initial selector for block
    CF set on error
        AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
        BX = size of largest available block
Note:    if the requested size is greater than 64K, contiguous selectors will
      be allocated, one for each 64K; for 32-bit applications, the first
      selector's limit will be set to the size of the entire block, while
      that selector will have a limit of 64K for 16-bit applications.  All
      selectors after the first one have a limit of 64K except the final
      one
SeeAlso: AX=FF22h,AX=FF23h,INT 21/AH=48h
--------E-31FF22-----------------------------
INT 31 P - CauseWay - "ResMemDOS" - RESIZE CONVENTIONAL MEMORY BLOCK
    AX = FF22h
    BX = new size in paragraphs
    DX = initial selector for block
Return: CF clear if successful
    CF set on error
        AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
        BX = maximum number of paragraphs available
Note:    this function will also fail if the block is expanded past a 64K
      boundary and the next selector is already in use
SeeAlso: AX=FF21h,AX=FF23h,INT 21/AH=49h
--------E-31FF23-----------------------------
INT 31 P - CauseWay - "RelMemDOS" - RELEASE CONVENTIONAL MEMORY BLOCK
    AX = FF23h
    DX = initial selector for block
Return: CF clear if successful
    CF set on error
        AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
Note:    all descriptors allocated for the block are freed
SeeAlso: AX=FF21h,AX=FF22h,INT 21/AH=4Ah
--------E-31FF24-----------------------------
INT 31 P - CauseWay - "ExecOverlay" - LOAD AND OPTIONALLY EXECUTE APP CODE
    AX = FF24h
    EBX = flags
        bit 0: don't execute (overlay only)
        bit 1: don't preserve relocation information
    ES:EDX -> filename (see also #03163)
    FS:ESI -> commandline (ESI = 00000000h if no commandline)
    GS:EDI -> name (CW's /o option)
Return: CF clear if successful
        ---EBX bit 0 set---
        CX:EDX = program entry point (CS:EIP)
        SI = segment of PSP
        ---EBX bit 1 set---
        BX:EAX = initial SS:ESP
        EDI high word = base segment
        EDI low word = number of segments
        EBP = start of segment definitions
    CF set on error
        AX = error code
        0001h DOS file access error
        0002h not a CuaseWay 3P file
        0003h not enough memory
SeeAlso: AX=FF2Ah,INT 21/AH=4Bh

Format of CauseWay executable:
Offset    Size    Description    (Table 03163)
 00h  2 BYTEs    signature "3P"
 02h    DWORD    size of header data in bytes
 06h    DWORD    size of EXE image data in bytes
 0Ah    DWORD    number of bytes of program memory required
 0Eh    WORD    number of segment definitions (see #03165)
 10h    DWORD    number of relocation table entries
 14h    DWORD    offset of program entry point
 18h    WORD    segment list entry number for entry point's CS
 1Ah    DWORD    initial ESP
 1Eh    WORD    segment list entry number for initial SS
 20h    DWORD    control flags (see #03164)
 24h    DWORD    automatic stack size in bytes if ESP entry = 00000000h
 28h    BYTE    length of name (name follows program image)
 29h 23 BYTEs    reserved
SeeAlso: #01594,#01609 at INT 21/AH=4Bh

Bitfields for CauseWay executable control flags:
Bit(s)    Description    (Table 03164)
 0    16-bit interrupt stack frame
 7    descriptor table type (0 = GDT, 1 = LDT)
 14    16-bit default data size
 31    compressed EXE image
Note:    bits 0 and 14 should always be equal
SeeAlso: #03163

Format of CauseWay segment definition [array]:
Offset    Size    Description    (Table 03165)
 00h    DWORD    start offset within program image
 04h    DWORD    length and type
        bits 0-19: length
        bit 20:       granularity (if set, length is in 4K pages)
        bits 21-24: type
            0000 code
            0001 read/write data
            0010 stack
            0011 read-only data
        bit 25: force segment descriptor's D bit to 0
        bit 26: force segmetn descriptor's D bit to 1
SeeAlso: #03163
--------E-31FF25-----------------------------
INT 31 P - CauseWay - "GetDOSTrans" - GET DOS TRANSFER BUFFER
    AX = FF25h
Return: BX = real-mode segment of transfer buffer
    ECX = transfer buffer size
    DX = protected-mode selector for transfer buffer
Note:    the default buffer size of 8K is sufficient for most applications,
      but an application performing large amounts of file I/O may benefit
      from allocating its own, larger buffer
SeeAlso: AX=FF00h,AX=FF26h
--------E-31FF26-----------------------------
INT 31 P - CauseWay - "SetDOSTrans" - SET DOS TRANSFER BUFFER
    AX = FF26h
    BX = real-mode segment of new transfer buffer
    ECX = new transfer buffer size
    DX = protected-mode selector for new transfer buffer
Return: nothing
Note:    the specific buffer must be located in conventional memory; only the
      first 64K will be used
SeeAlso: AX=FF25h
--------E-31FF27-----------------------------
INT 31 P - CauseWay v1.3 - "GetMCBSize" - GET CURRENT MCB ALLOCATION BLOCK SIZE
    AX = FF27h
Return: ECX = current threshold
Desc:    determine the memory allocation size below which CauseWay will use
      internal MCB chains rather than allocating full 4K pages via DPMI
SeeAlso: AX=FF00h,AX=FF28h
--------E-31FF28-----------------------------
INT 31 P - CauseWay v1.3 - "SetMCBSize" - SET MCB MEMORY ALLOCATION BLOCK SIZE
    AX = FF28h
    ECX = new threshold (0000000h to disable MCB memory allocation system)
Return: CF clear if successful
        threshold unchanged (default 16K)
    CF set on error (threshold > 64K)
Desc:    specify the memory allocation size below which CauseWay will use
      internal MCB chains rather than allocating full 4K pages via DPMI
Note:    the specified threshold will be rounded up to the next higher multiple
      of 4K
SeeAlso: AX=FF00h,AX=FF27h
--------E-31FF29-----------------------------
INT 31 P - CauseWay v1.3 - "GetSels" - ALLOCATE MULTIPLE SELECTORS
    AX = FF29h
    CX = number of selectors to allocate
Return: BX = base selector
Desc:    allocate multiple contiguous selectors, initializing each to have a
      base address and limit of zero
SeeAlso: AX=FF00h,AX=FF04h
--------E-31FF2A-----------------------------
INT 31 P - CauseWay v1.3 - "cwLoad" - LOAD ANOTHER CAUSEWAY PROGRAM AS OVERLAY
    AX = FF2Ah
    DS:EDX -> filename
Return: CF clear if successful
        CX:EDX = CS:EIP of entry point
        BX:EAX = initial SS:ESP for program
        SI = PSP for overlay program
    CF set on error
        AX = error code (01h file error, 02h not a 3P file, 03h no memory)
Note:    the returned PSP can be given to "RelMem" (AX=FF0Fh) to release the
      overlay's memory and selectors; only selectors and memory allocated
      during loading will be freed by RelMem unless one switches PSPs with
      INT 21/AH=50h
SeeAlso: AX=FF00h,AX=FF24h
--------E-31FF2B-----------------------------
INT 31 P - CauseWay v1.3 - "cwcInfo" - VALIDATE AND GET SIZE OF CWC FILE
    AX = FF2Bh
    BX = file handle for CWC-compressed file
Return: CF clear if successful
        ECX = expanded file size
    CF set on error (not a CWC-compressed file)
SeeAlso: AX=FF00h,AX=FFFBh
--------E-31FF2C-----------------------------
INT 31 P - CauseWay v1.3 - "GetMemSO" - ALLOCATE MEMORY AND RETURN SEL:OFFSET
    AX = FF2Ch
    CX:DX = block size in bytes
Return: CF clear if successful
       SI:DI = selector:offset of allocated memory
    CF set on error
Note:    unlike "GetMem" (AX=FF0Bh), this function will reuse selectors until a
      segment is full, rather than allocating a new selector for each
      memory block
SeeAlso: AX=FF00h,AX=FF2Dh,AX=FF2Eh
--------E-31FF2D-----------------------------
INT 31 P - CauseWay v1.3 - "ResMemSO" - RESIZE SELECTOR:OFFSET MEMORY BLOCK
    AX = FF2Dh
    SI:DI = selector:offset for memory block
    CX:DX = new size of block
Return: CF clear if successful
       SI:DI = new selector:offset for memory block
    CF set on error
SeeAlso: AX=FF00h,AX=FF2Ch,AX=FF2Eh
--------E-31FF2E-----------------------------
INT 31 P - CauseWay v1.3 - "RelMemSO" - RELEASE SELECTOR:OFFSET MEMORY BLOCK
    AX = FF2Eh
    SI:DI = selector:offset for memory block
SeeAlso: AX=FF00h
--------E-31FFFB-----------------------------
INT 31 P - Causeway v1.3 - "cwcLoad" - LOAD/EXPAND CWC-COMPRESSED FILE
    AX = FFFBh
    BX = source file handle
    ES:EDI -> memory buffer into which to expand file
Return: CF clear if successful
        ECX = expanded data length
    CF set on error
        EAX = error code (01h file error, 02h bad data, 03h not CWC file)
Note:    the provided file may consist of the concatenation of several CWC
      files; the one beginning at the current file position will be
      expanded
SeeAlso: AX=FF2Bh
--------v-32---------------------------------
INT 32 - VIRUS - "Tiny" Viruses - ORIGINAL INT 21h VECTOR
SeeAlso: INT 21/AX=FFFFh"VIRUS",INT 31"VIRUS",INT 44"VIRUS"
--------v-32---------------------------------
INT 32 - VIRUS - "Plovdiv 1.3"/"Damage 1.3" - ORIGINAL INT 21h VECTOR
SeeAlso: INT 31"VIRUS",INT 9E"VIRUS"
--------y-326E-------------------------------
INT 32 - NOISE.SYS 0.53 - API
    AH = 6Eh (function ID)
    AL = subfunction (see INT 32/AX=6E00h)
Return: CF set on error
        AL = error code (see #03166)
    CF clear if successful
Notes:    INT 32 is only a proposed interface for NOISE.SYS. Use the IOCTL READ
      from the RANDOM device to determine the interrupt and function ID
      used by the driver, since future versions may use the Alternate
      Multiplex Interrupt (AMIS) at INT 2Dh.
    the beta v0.51 had a substantially different API on INT 32/AH=6Eh

(Table 03166)
Values for NOISE.SYS error codes:
 00h    subfunction not supported
 FBh    random pool is empty
 FCh    quality of sample is too low
 FDh    too many processes using the API or driver
 FEh    subfunction is disabled in the current build
 FFh    successful
--------y-326E00-----------------------------
INT 32 - NOISE.SYS v0.53+ - INSTALLATION CHECK
    AX = 6E00h
Return: AL = installation status
        00h not installed
        FFh installed
        CX = version (ie, 0123h = Version 1.2.3)
        DX:DI -> signature string
--------y-326E01-----------------------------
INT 32 - NOISE.SYS v0.53+ - GET ENTRY POINT
    AX = 6E01h
Return: AL = FFh
    DX:DI -> far call hook
----------326E04-----------------------------
INT 32 - NOISE.SYS v0.55+ - GET INTERRUPT HOOK LIST
    AX = 6E04h
Return: AL = status
        00h = unimplemented
        04h = DX:BX -> interrupt hook list
        FEh = subfunction disabled
Note:    the hook list array ends with API interrupt (usually 32h, although
      it will differ if the API is installed at another interrupt)
----------326E06-----------------------------
INT 32 - NOISE.SYS v0.55+ - GET DEVICE DRIVER HEADER
    AX = 6E06h
Return: AL = number of device drivers in NOISE.SYS chain
        02h = default (for RANDOM and URANDOM devices)
    AH = AMIS device driver flags (set to 00h for now)
    DX:BX -> first device in chain (see #01646)
SeeAlso: INT 2D/AL=06h
--------y-326E10-----------------------------
INT 32 - NOISE.SYS v0.53+ - STATUS CHECK
    AX = 6E10h
Return: CF set on error
        AL = error code (FDh) (see #03166)
    CF clear if successful
        AL = status
        FFh successful
        BH = number of processes using the API
        CX = number of random bytes waiting
        DX = maximum possible bytes waiting
        (if CX=DX, the pool is full)
Note:    this subfunction is a convenient way to check the driver if any
      fresh bytes are waiting in the output pool.
SeeAlso: INT 32/AH=6Eh,AX=6E00h,AX=6E11h
--------y-326E11-----------------------------
INT 32 - NOISE.SYS v0.53+ - GET ENTROPY ESTIMATE
    AX = 6E11h
Return: CF set on error
        AL = error code (00h,FDh,FEh) (see #03166)
    CF clear if successful
        EBX = estimated bit count (refer to note below)
        CL = FRACBITS (number of fractional bits)
        EDX = low 32-bits of total number of samples added
Note:  the estimated number of fresh random bits is equal to
      (EAX >> FRACBITS) + ((EAX & ((1 << FRACBITS)-1) / (1 << FRACBITS))
SeeAlso: AH=6Eh,AX=6E00h
--------y-326E12-----------------------------
INT 32 - NOISE.SYS v0.53+ - ADD SAMPLE FROM FAST TIMER
    AX = 6E12h
Return: CF set on error
        AL = error code (FCh,FDh,FEh) (see #03166)
    CF clear if successful
        CX = number of random bytes waiting
Note:    subfunctions 12h and 13h are meant for applications or devices
      which are able to gather entropy from other sources which are
      not polled by NOISE.SYS (for example, a communications driver
      could use this call to sample packet arrival times).
SeeAlso: AX=6E00h,AX=6E10h,AX=6E13h
--------y-326E13-----------------------------
INT 32 - NOISE.SYS v0.53+ - ADD 16-BIT SAMPLE TO RANDOM POOL
    AX = 6E13h
    DX = sample
Return: CF set on error
        AL = error code (FCh,FEh) (see #03166)
    CF clear if successful
        CX = number of random bytes waiting
SeeAlso: AX=6E00h,AX=6E11h
--------y-326E14-----------------------------
INT 32 - NOISE.SYS v0.53+ - GET FLAGS
    AX = 6E14h
Return: BX = flags (see #03167)
    CX = mask of settable flags in BX
SeeAlso: AX=6E00h,AX=6E15h

Bitfields for NOISE.SYS flags:
Bit(s)    Description    (Table 03167)
 0    MS Windows active
 1-5    reserved
 6    clock drift sampling
 7    video retrace drift sampling
 8    network access sampling (not implemented yet in 0.53)
 9    CD-ROM access sampling (not implemented yet in 0.53)
 10    DOS spinner
 11    DOS process start/end and miscellaneous process activity sampling
 12    mouse movement/button sampling
 13    disk sampling (INT 13)
 14    keystroke timings
 15    reserved for hardware RNG
--------y-326E15-----------------------------
INT 32 - NOISE.SYS v0.53+ - SET FLAGS
    AX = 6E15h
    BX = flags (see #03167)
Return: BX = new flags
Note:    flags which AX=6E14h indicates are not settable should be masked off
      by ANDing with the CX returned by AX=6E14h
SeeAlso: AX=6E00h,AX=6E14h
--------y-326E16-----------------------------
INT 32 - NOISE.SYS v0.53+ - READ URANDOM BYTES
    AX = 6E16h
    CX = number of bytes
    ES:DI -> buffer
Return: CF set on error
        AL = error code (FDh,FEh) (see #03166)
    CF clear if successful
        CX = number of random bytes read
SeeAlso: AX=6E00h,AX=6E12h,AX=6E17h
--------y-326E17-----------------------------
INT 32 - NOISE.SYS v0.53+ - READ RANDOM BYTES
    AX = 6E17h
    CX = number of bytes
    ES:DI -> buffer
Return: CF set on error
        AL = error code (FBh,FDh,FEh) (see #03166)
    CF clear if successful
        CX = number of random bytes read
SeeAlso: AX=6E00h,AX=6E16h
----------326E18-----------------------------
INT 32 - NOISE.SYS v0.6+ - READ CONTROL RECORD
    AX = 6E18h
    CX = buffer size
    ES:DI -> buffer
Return: AL = status
        00h unimplemented (before v0.6)
        FEh subfunction is disabled
        FFh successful
        CX = number of bytes read
Note:    the control record corresponds to the IOCTL Read record for the RANDOM
      device
----------326E-------------------------------
INT 32 - NOISE.SYS - RESERVED FOR FUTURE USE
    AH = 6Eh
    AL = 19h to 3Fh
Return: AL = 00h
Note:    these functions are reserved for future use; user additions to the
      the driver should use subfunctions 40h to FFh.
--------M-330000-----------------------------
INT 33 - MS MOUSE - RESET DRIVER AND READ STATUS
    AX = 0000h
Return: AX = status
        0000h hardware/driver not installed
        FFFFh hardware/driver installed
    BX = number of buttons
        0000h other than two
        0002h two buttons (many drivers)
        0003h Mouse Systems/Logitech three-button mouse
        FFFFh two buttons
Notes:    to use mouse on a Hercules-compatible monographics card in graphics
      mode, you must first set 0040h:0049h to 6 for page 0 or 5 for page 1,
      and then call this function.    Logitech drivers v5.01 and v6.00
      reportedly do not correctly use Hercules graphics in dual-monitor
      systems, while version 4.10 does.
    the Logitech mouse driver contains the signature string "LOGITECH"
      three bytes past the interrupt handler; many of the Logitech mouse
      utilities check for this signature.
    Logitech MouseWare v6.30 reportedly does not support CGA video modes
      if no CGA is present when it is started and the video board is
      later switched into CGA emulation
SeeAlso: AX=0011h,AX=0021h,AX=002Fh,INT 62/AX=007Ah,INT 74
--------M-330001-----------------------------
INT 33 - MS MOUSE v1.0+ - SHOW MOUSE CURSOR
    AX = 0001h
SeeAlso: AX=0002h,INT 16/AX=FFFEh,INT 62/AX=007Bh,INT 6F/AH=06h"F_TRACK_ON"
--------M-330002-----------------------------
INT 33 - MS MOUSE v1.0+ - HIDE MOUSE CURSOR
    AX = 0002h
Note:    multiple calls to hide the cursor will require multiple calls to
      function 01h to unhide it.
SeeAlso: AX=0001h,AX=0010h,INT 16/AX=FFFFh,INT 62/AX=007Bh
SeeAlso: INT 6F/AH=08h"F_TRACK_OFF"
--------M-330003-----------------------------
INT 33 - MS MOUSE v1.0+ - RETURN POSITION AND BUTTON STATUS
    AX = 0003h
Return: BX = button status (see #03168)
    CX = column
    DX = row
Note:    in text modes, all coordinates are specified as multiples of the cell
      size, typically 8x8 pixels
SeeAlso: AX=0004h,AX=000Bh,INT 2F/AX=D000h"ZWmous"

Bitfields for mouse button status:
Bit(s)    Description    (Table 03168)
 0    left button pressed if 1
 1    right button pressed if 1
 2    middle button pressed if 1 (Mouse Systems/Logitech/Genius)
--------M-330004-----------------------------
INT 33 - MS MOUSE v1.0+ - POSITION MOUSE CURSOR
    AX = 0004h
    CX = column
    DX = row
Note:    the row and column are truncated to the next lower multiple of the cell
      size (typically 8x8 in text modes); however, some versions of the
      Microsoft documentation incorrectly state that the coordinates are
      rounded
SeeAlso: AX=0003h,INT 62/AX=0081h,INT 6F/AH=10h"F_PUT_SPRITE"
--------M-330005-----------------------------
INT 33 - MS MOUSE v1.0+ - RETURN BUTTON PRESS DATA
    AX = 0005h
    BX = button number (see #03169)
Return: AX = button states (see #03168)
    BX = number of times specified button has been pressed since last call
    CX = column at time specified button was last pressed
    DX = row at time specified button was last pressed
Note:    at least for the Genius mouse driver, the number of button presses
      returned is limited to 7FFFh
SeeAlso: AX=0006h,INT 62/AX=007Ch

(Table 03169)
Values for mouse button number:
 0000h    left
 0001h    right
 0002h    middle (Mouse Systems/Logitech/Genius mouse)
--------M-330006-----------------------------
INT 33 - MS MOUSE v1.0+ - RETURN BUTTON RELEASE DATA
    AX = 0006h
    BX = button number (see #03169)
Return: AX = button states (see #03168)
    BX = number of times specified button has been released since last call
    CX = column at time specified button was last released
    DX = row at time specified button was last released
Note:    at least for the Genius mouse driver, the number of button releases
      returned is limited to 7FFFh
SeeAlso: AX=0005h,INT 62/AX=007Ch
--------M-330007-----------------------------
INT 33 - MS MOUSE v1.0+ - DEFINE HORIZONTAL CURSOR RANGE
    AX = 0007h
    CX = minimum column
    DX = maximum column
Note:    in text modes, the minimum and maximum columns are truncated to the
      next lower multiple of the cell size, typically 8x8 pixels
SeeAlso: AX=0008h,AX=0010h,AX=0031h,INT 62/AX=0080h
SeeAlso: INT 6F/AH=0Ch"F_SET_LIMITS_X"
--------M-330008-----------------------------
INT 33 - MS MOUSE v1.0+ - DEFINE VERTICAL CURSOR RANGE
    AX = 0008h
    CX = minimum row
    DX = maximum row
Note:    in text modes, the minimum and maximum rows are truncated to the
      next lower multiple of the cell size, typically 8x8 pixels
SeeAlso: AX=0007h,AX=0010h,AX=0031h,INT 62/AX=0080h
SeeAlso: INT 6F/AH=0Eh"F_SET_LIMITS_Y"
--------M-330009-----------------------------
INT 33 - MS MOUSE v3.0+ - DEFINE GRAPHICS CURSOR
    AX = 0009h
    BX = column of cursor hot spot in bitmap (-16 to 16)
    CX = row of cursor hot spot (-16 to 16)
    ES:DX -> mask bitmap (see #03170)
Notes:    in graphics modes, the screen contents around the current mouse cursor
      position are ANDed with the screen mask and then XORed with the
      cursor mask
    the Microsoft mouse driver v7.04 and v8.20 uses only BL and CL, so the
      hot spot row/column should be limited to -128..127
    Microsoft KnowledgeBase article Q19850 states that the high bit is
      right-most, but that statement is contradicted by all other available
      documentation
SeeAlso: AX=000Ah,AX=0012h,AX=002Ah,INT 62/AX=007Fh,INT 6F/AH=0Ah"F_DEF_MASKS"

Format of mouse mask bitmap:
Offset    Size    Description    (Table 03170)
 00h 16 WORDs    screen mask
 10h 16 WORDs    cursor mask
Note:    each word defines the sixteen pixels of a row, low bit rightmost
--------M-33000A-----------------------------
INT 33 - MS MOUSE v3.0+ - DEFINE TEXT CURSOR
    AX = 000Ah
    BX = hardware/software text cursor
        0000h software
        CX = screen mask
        DX = cursor mask
        0001h hardware
        CX = start scan line
        DX = end scan line
Note:    when the software cursor is selected, the character/attribute data at
      the current screen position is ANDed with the screen mask and then
      XORed with the cursor mask
SeeAlso: AX=0009h,INT 62/AX=007Eh
--------M-33000B-----------------------------
INT 33 - MS MOUSE v1.0+ - READ MOTION COUNTERS
    AX = 000Bh
Return: CX = number of mickeys mouse moved horizontally since last call
    DX = number of mickeys mouse moved vertically
Notes:    a mickey is the smallest increment the mouse can sense
    positive values indicate down/right
SeeAlso: AX=0003h,AX=001Bh,AX=0027h
--------M-33000C-----------------------------
INT 33 - MS MOUSE v1.0+ - DEFINE INTERRUPT SUBROUTINE PARAMETERS
    AX = 000Ch
    CX = call mask (see #03171)
    ES:DX -> FAR routine (see #03172)
SeeAlso: AX=0018h

Bitfields for mouse call mask:
Bit(s)    Description    (Table 03171)
 0    call if mouse moves
 1    call if left button pressed
 2    call if left button released
 3    call if right button pressed
 4    call if right button released
 5    call if middle button pressed (Mouse Systems/Logitech/Genius mouse)
 6    call if middle button released (Mouse Systems/Logitech/Genius mouse)
 7-15    unused
Note:    some versions of the Microsoft documentation incorrectly state that CX
      bit 0 means call if mouse cursor moves

(Table 03172)
Values interrupt routine is called with:
    AX = condition mask (same bit assignments as call mask)
    BX = button state
    CX = cursor column
    DX = cursor row
    SI = horizontal mickey count
    DI = vertical mickey count
Notes:    some versions of the Microsoft documentation erroneously swap the
      meanings of SI and DI
    in text modes, the row and column will be reported as a multiple of
      the character cell size, typically 8x8 pixels
--------M-33000D-----------------------------
INT 33 - MS MOUSE v1.0+ - LIGHT PEN EMULATION ON
    AX = 000Dh
SeeAlso: AX=000Eh,INT 10/AH=04h
--------M-33000E-----------------------------
INT 33 - MS MOUSE v1.0+ - LIGHT PEN EMULATION OFF
    AX = 000Eh
SeeAlso: AX=000Dh
--------M-33000F-----------------------------
INT 33 - MS MOUSE v1.0+ - DEFINE MICKEY/PIXEL RATIO
    AX = 000Fh
    CX = number of mickeys per 8 pixels horizontally (default 8)
    DX = number of mickeys per 8 pixels vertically (default 16)
SeeAlso: AX=0013h,AX=001Ah,INT 62/AX=0082h
--------M-330010-----------------------------
INT 33 - MS MOUSE v1.0+ - DEFINE SCREEN REGION FOR UPDATING
    AX = 0010h
    CX,DX = X,Y coordinates of upper left corner
    SI,DI = X,Y coordinates of lower right corner
Note:    mouse cursor is hidden in the specified region, and needs to be
      explicitly turned on again
SeeAlso: AX=0001h,AX=0002h,AX=0007h,AX=0010h"Genius MOUSE",AX=0031h
--------M-330010-----------------------------
INT 33 - Genius MOUSE - DEFINE SCREEN REGION FOR UPDATING
    AX = 0010h
    ES:DX -> update region list (see #03173)
Notes:    mouse cursor is hidden in the specified region, and needs to be
      explicitly turned on again
    this version of the call is described in an August 1988 version of the
      Genius Mouse programmer's reference; it has been changed to conform
      to the Microsoft version shown above by version 9.06 (and possibly
      earlier versions)
SeeAlso: AX=0001h,AX=0002h,AX=0007h,AX=0010h"MS MOUSE"

Format of Genius Mouse update region list:
Offset    Size    Description    (Table 03173)
 00h    WORD    left-most column
 02h    WORD    top-most row
 04h    WORD    right-most column
 06h    WORD    bottom-most row
--------M-330011-----------------------------
INT 33 - Genius Mouse 9.06 - GET NUMBER OF BUTTONS
    AX = 0011h
Return: AX = FFFFh
    BX = number of buttons
SeeAlso: AX=0000h
--------M-330012-----------------------------
INT 33 - MS MOUSE - SET LARGE GRAPHICS CURSOR BLOCK
    AX = 0012h
    BH = cursor width in words
    CH = rows in cursor
    BL = horizontal hot spot (-16 to 16)
    CL = vertical hot spot (-16 to 16)
    ES:DX -> bit map of screen and cursor maps
Return: AX = FFFFh if successful
SeeAlso: AX=0009h,AX=002Ah,AX=0035h
--------M-330013-----------------------------
INT 33 - MS MOUSE v5.0+ - DEFINE DOUBLE-SPEED THRESHOLD
    AX = 0013h
    DX = threshold speed in mickeys/second, 0000h = default of 64/second
Note:    if speed exceeds threshold, the cursor's on-screen motion is doubled
SeeAlso: AX=000Fh,AX=001Bh,AX=002Ch
--------M-330014-----------------------------
INT 33 - MS MOUSE v3.0+ - EXCHANGE INTERRUPT SUBROUTINES
    AX = 0014h
    CX = call mask (see #03171)
    ES:DX -> FAR routine
Return: CX = call mask of previous interrupt routine
    ES:DX = FAR address of previous interrupt routine
SeeAlso: AX=000Ch,AX=0018h
--------M-330015-----------------------------
INT 33 - MS MOUSE v6.0+ - RETURN DRIVER STORAGE REQUIREMENTS
    AX = 0015h
Return: BX = size of buffer needed to store driver state
SeeAlso: AX=0016h,AX=0017h,AX=0042h
--------M-330016-----------------------------
INT 33 - MS MOUSE v6.0+ - SAVE DRIVER STATE
    AX = 0016h
    BX = size of buffer (see AX=0015h)
    ES:DX -> buffer for driver state
Note:    although not documented (since the Microsoft driver does not use it),
      many drivers appear to require BX on input
SeeAlso: AX=0015h,AX=0017h
--------M-330017-----------------------------
INT 33 - MS MOUSE v6.0+ - RESTORE DRIVER STATE
    AX = 0017h
    BX = size of buffer (see AX=0015h)
    ES:DX -> buffer containing saved state
Notes:    although not documented (since the Microsoft driver does not use it),
      many drivers appear to require BX on input
    some mouse drivers range-check the values in the saved state based on
      the current video mode; thus, the video mode should be restored
      before the mouse driver's state is restored
SeeAlso: AX=0015h,AX=0016h
--------M-330018-----------------------------
INT 33 - MS MOUSE v6.0+ - SET ALTERNATE MOUSE USER HANDLER
    AX = 0018h
    CX = call mask (see #03174)
    ES:DX -> FAR routine to be invoked on mouse events (see #03175)
Return: AX = status
        0018h if successful
        FFFFh on error
Notes:    up to three handlers can be defined by separate calls to this function,
      each with a different combination of shift states in the call mask;
      calling this function again with a call mask of 0000h undefines the
      specified handler (official documentation); specifying the same
      call mask and an address of 0000h:0000h undefines the handler (real
      life)
    some versions of the documentation erroneously reverse the order of
      the bits in the call mask
SeeAlso: AX=000Ch,AX=0014h,AX=0019h

Bitfields for mouse call mask:
Bit(s)    Description    (Table 03174)
 0    call if mouse moves
 1    call if left button pressed
 2    call if left button released
 3    call if right button pressed
 4    call if right button released
 5    call if shift button pressed during event
 6    call if ctrl key pressed during event
 7    call if alt key pressed during event
Note:    at least one of 5-7 must be set

(Table 03175)
Values user handler is called with:
    AX = condition mask (same bit assignments as call mask)
    BX = button state
    CX = cursor column
    DX = cursor row
    SI = horizontal mickey count
    DI = vertical mickey count
Return: registers preserved
Note:    in text modes, the row and column will be reported as a multiple of
      the cell size, typically 8x8 pixels
--------M-330019-----------------------------
INT 33 - MS MOUSE v6.0+ - RETURN USER ALTERNATE INTERRUPT VECTOR
    AX = 0019h
    CX = call mask (see #03174)
Return: BX:DX = user interrupt vector
    CX = call mask (0000h if not found)
Note:    attempts to find a user event handler (defined by function 18h)
      whose call mask matches CX
SeeAlso: AX=0018h
--------M-33001A-----------------------------
INT 33 - MS MOUSE v6.0+ - SET MOUSE SENSITIVITY
    AX = 001Ah
    BX = horizontal speed \
    CX = vertical speed   / (see AX=000Fh)
    DX = double speed threshold (see AX=0013h)
SeeAlso: AX=0013h,AX=001Bh,INT 62/AX=0082h
--------M-33001B-----------------------------
INT 33 - MS MOUSE v6.0+ - RETURN MOUSE SENSITIVITY
    AX = 001Bh
Return: BX = horizontal speed
    CX = vertical speed
    DX = double speed threshold
SeeAlso: AX=000Bh,AX=001Ah
--------M-33001C-----------------------------
INT 33 - MS MOUSE v6.0+ - SET INTERRUPT RATE
    AX = 001Ch
    BX = rate (see #03176)
Notes:    only available on InPort mouse
    values greater than 4 may cause unpredictable driver behavior

(Table 03176)
Values for mouse interrupt rate:
 00h    no interrupts allowed
 01h    30 per second
 02h    50 per second
 03h    100 per second
 04h    200 per second
--------M-33001D-----------------------------
INT 33 - MS MOUSE v6.0+ - DEFINE DISPLAY PAGE NUMBER
    AX = 001Dh
    BX = display page number
Note:    the cursor will be displayed on the specified page
SeeAlso: AX=001Eh
--------M-33001E-----------------------------
INT 33 - MS MOUSE v6.0+ - RETURN DISPLAY PAGE NUMBER
    AX = 001Eh
Return: BX = display page number
SeeAlso: AX=001Dh
--------M-33001F-----------------------------
INT 33 - MS MOUSE v6.0+ - DISABLE MOUSE DRIVER
    AX = 001Fh
Return: AX = status
        001Fh successful
        ES:BX = INT 33 vector before mouse driver was first installed
        FFFFh unsuccessful
Notes:    restores vectors for INT 10 and INT 71 (8086) or INT 74 (286/386)
    if you restore INT 33 to ES:BX, driver will be completely disabled
    many drivers return AX=001Fh even though the driver has been disabled
SeeAlso: AX=0020h
--------M-330020-----------------------------
INT 33 - MS MOUSE v6.0+ - ENABLE MOUSE DRIVER
    AX = 0020h
Return: AX = status
        0020h successful
        FFFFh unsuccessful
Notes:    restores vectors for INT 10h and INT 71h (8086) or INT 74h (286/386)
      which were removed by function 1Fh
    Microsoft's documentation states that no value is returned
SeeAlso: AX=001Fh
--------M-330021-----------------------------
INT 33 - MS MOUSE v6.0+ - SOFTWARE RESET
    AX = 0021h
Return: AX = status
        FFFFh if mouse driver installed
        BX = number of buttons (FFFFh = two buttons)
        0021h if mouse driver not installed
Note:    this call is identical to funtion 00h, but does not reset the mouse
SeeAlso: AX=0000h
--------M-330022-----------------------------
INT 33 - MS MOUSE v6.0+ - SET LANGUAGE FOR MESSAGES
    AX = 0022h
    BX = language (see #03177)
Note:    only available on international versions of the driver; US versions
      ignore this call
SeeAlso: AX=0023h

(Table 03177)
Values for mouse driver language:
 00h    English
 01h    French
 02h    Dutch
 03h    German
 04h    Swedish
 05h    Finnish
 06h    Spanish
 07h    Portugese
 08h    Italian
--------M-330023-----------------------------
INT 33 - MS MOUSE v6.0+ - GET LANGUAGE FOR MESSAGES
    AX = 0023h
Return: BX = language (see #03177)
Note:    the US version of the driver always returns zero
SeeAlso: AX=0022h
--------M-330024-----------------------------
INT 33 - MS MOUSE v6.26+ - GET SOFTWARE VERSION, MOUSE TYPE, AND IRQ NUMBER
    AX = 0024h
Return: AX = FFFFh on error
    otherwise,
        BH = major version
        BL = minor version
        CH = type (1=bus, 2=serial, 3=InPort, 4=PS/2, 5=HP)
        CL = interrupt (0=PS/2, 2=IRQ2, 3=IRQ3,...,7=IRQ7,...,0Fh=IRQ15)
SeeAlso: AX=004Dh,AX=006Dh
--------M-330025-----------------------------
INT 33 - MS MOUSE v6.26+ - GET GENERAL DRIVER INFORMATION
    AX = 0025h
Return: AX = general information (see #03178)
    BX = cursor lock flag for OS/2 to prevent reentrancy problems
    CX = mouse code active flag (for OS/2)
    DX = mouse driver busy flag (for OS/2)

Bitfields for general mouse driver information:
Bit(s)    Description    (Table 03178)
 15    driver loaded as device driver rather than TSR
 14    driver is newer integrated type
 13,12    current cursor type
    00 software text cursor
    01 hardware text cursor (CRT Controller's cursor)
    1X graphics cursor
 11-8    interrupt rate (see #03176)
 7-0    count of currently-active Mouse Display Drivers (MDD), the newer
      integrated driver type
--------M-330026-----------------------------
INT 33 - MS MOUSE v6.26+ - GET MAXIMUM VIRTUAL COORDINATES
    AX = 0026h
Return: BX = mouse-disabled flag (0000h mouse enabled, nonzero disabled)
    CX = maximum virtual X (for current video mode)
    DX = maximum virtual Y
Note:    for driver versions before 7.05, this call returns the currently-set
      maximum coordinates; v7.05+ returns the absolute maximum coordinates
SeeAlso: AX=0031h
--------M-330026-----------------------------
INT 33 - Genius Mouse 9.06 - ???
    AX = 0026h
Return: CX = 0204h if CX was 0105h on entry, else unchanged
--------M-330027-----------------------------
INT 33 - MS MOUSE v7.01+ - GET SCREEN/CURSOR MASKS AND MICKEY COUNTS
    AX = 0027h
Return: AX = screen-mask value (or hardware cursor scan-line start for v7.02+)
    BX = cursor-mask value (or hardware cursor scan-line stop for v7.02+)
    CX = horizontal mickeys moved since last call
    DX = vertical mickeys moved since last call
SeeAlso: AX=000Bh
--------M-330028-----------------------------
INT 33 - MS MOUSE v7.0+ - SET VIDEO MODE
    AX = 0028h
    CX = new video mode (call is NOP if 0000h)
    DH = Y font size (00h = default)
    DL = X font size (00h = default)
Return: CL = status (00h = successful)
Notes:    DX is ignored unless the selected video mode supports font size control
    when CX=0000h, an internal flag that had been set by a previous call
      is cleared; this is required before a mouse reset
SeeAlso: AX=0029h,INT 10/AH=00h
--------M-330029-----------------------------
INT 33 - MS MOUSE v7.0+ - ENUMERATE VIDEO MODES
    AX = 0029h
    CX = previous video mode
        0000h get first supported video mode
        other get next supported mode after mode CX
Return: CX = first/next video mode (0000h = no more video modes)
    DS:DX -> description of video mode or 0000h:0000h if none
Notes:    the enumerated video modes may be in any order and may repeat
    the description string (if available) is terminated by '$' followed by
      a NUL byte
SeeAlso: AX=0028h
--------M-33002A-----------------------------
INT 33 - MS MOUSE v7.02+ - GET CURSOR HOT SPOT
    AX = 002Ah
Return: AX = internal counter controlling cursor visibility
    BX = cursor hot spot column
    CX = cursor hot spot row
    DX = mouse type (see #03179)
Note:    the hot spot location is relative to the upper left corner of the
      cursor block and may range from -128 to +127 both horizontally and
      vertically
SeeAlso: AX=0009h,AX=0012h,AX=0035h

(Table 03179)
Values for mouse type:
 00h    none
 01h    bus
 02h    serial
 03h    InPort
 04h    IBM
 05h    Hewlett-Packard
--------M-33002B-----------------------------
INT 33 - MS MOUSE v7.0+ - LOAD ACCELERATION PROFILES
    AX = 002Bh
    BX = active acceleration profile
        0001h-0004h or FFFFh to restore default curves
    ES:SI -> buffer containing acceleration profile data (see #03180)
Return: AX = success flag
SeeAlso: AX=002Ch,AX=002Dh,AX=0033h

Format of acceleration profile data:
Offset    Size    Description    (Table 03180)
 00h    BYTE    length of acceleration profile 1
 01h    BYTE    length of acceleration profile 2
 02h    BYTE    length of acceleration profile 3
 03h    BYTE    length of acceleration profile 4
 04h 32 BYTEs    threshold speeds for acceleration profile 1
 24h 32 BYTEs    threshold speeds for acceleration profile 2
 44h 32 BYTEs    threshold speeds for acceleration profile 3
 64h 32 BYTEs    threshold speeds for acceleration profile 4
 84h 32 BYTEs    speedup factor for acceleration profile 1
        (10h = 1.0, 14h = 1.25, 20h = 2.0, etc)
 A4h 32 BYTEs    speedup factor for acceleration profile 2
        (10h = 1.0, 14h = 1.25, 20h = 2.0, etc)
 C4h 32 BYTEs    speedup factor for acceleration profile 3
        (10h = 1.0, 14h = 1.25, 20h = 2.0, etc)
 E4h 32 BYTEs    speedup factor for acceleration profile 4
        (10h = 1.0, 14h = 1.25, 20h = 2.0, etc)
104h 16 BYTEs    name of acceleration profile 1 (blank-padded)
114h 16 BYTEs    name of acceleration profile 2 (blank-padded)
124h 16 BYTEs    name of acceleration profile 3 (blank-padded)
134h 16 BYTEs    name of acceleration profile 4 (blank-padded)
Note:    unused bytes in the threshold speed fields are filled with 7Fh and
      unused bytes in the speedup factor fields are filled with 10h
--------M-33002C-----------------------------
INT 33 - MS MOUSE v7.0+ - GET ACCELERATION PROFILES
    AX = 002Ch
Return: AX = status (0000h success)
    BX = currently-active acceleration profile
    ES:SI -> acceleration profile data (see #03180)
SeeAlso: AX=002Bh,AX=002Dh,AX=0033h
--------M-33002D-----------------------------
INT 33 - MS MOUSE v7.0+ - SELECT ACCELERATION PROFILE
    AX = 002Dh
    BX = acceleration level
        0001h-0004h to set profile, or FFFFh to get current profile
Return: AX = status
        0000h successful
        ES:SI -> 16-byte blank-padded name of acceleration profile
        FFFEh invalid acceleration curve number
        ES:SI destroyed
    BX = active acceleration curve number
SeeAlso: AX=0013h,AX=002Bh,AX=002Ch,AX=002Eh
--------M-33002E-----------------------------
INT 33 - MS MOUSE v8.10+ - SET ACCELERATION PROFILE NAMES
    AX = 002Eh
    BL = flag (if nonzero, fill ES:SI buffer with default names on return)
    ES:SI -> 64-byte buffer containing profile names (16 bytes per name)
Return: AX = status (0000h success)
        FFFEh error for ATI Mouse driver
    ES:SI buffer filled with default names if BL nonzero on entry
Notes:    not supported by Logitech driver v6.10
    supported by ATI Mouse driver v7.04
SeeAlso: AX=002Ch,AX=002Dh,AX=012Eh,AX=022Eh
--------M-33002F-----------------------------
INT 33 - MS MOUSE v7.02+ - MOUSE HARDWARE RESET
    AX = 002Fh
Return: AX = status
Note:    invoked by mouse driver v8.20 on being called with INT 2F/AX=530Bh
SeeAlso: INT 2F/AH=53h
--------M-330030-----------------------------
INT 33 - MS MOUSE v7.04+ - GET/SET BallPoint INFORMATION
    AX = 0030h
    CX = command
        0000h get status of BallPoint device
        other set rotation angle and masks
        BX = rotation angle (-32768 to 32767 degrees)
        CH = primary button mask
        CL = secondary button mask
Return: AX = button status (FFFFh if no BallPoint) (see #03181)
    BX = rotation angle (0-360 degrees)
    CH = primary button mask
    CL = secondary button mask
Note:    not supported by the ATI Mouse driver which calls itself v7.04

Bitfields for BallPoint mouse button status:
Bit(s)    Description    (Table 03181)
 5    button 1
 4    button 2
 3    button 3
 2    button 4
 other    zero
--------M-330031-----------------------------
INT 33 - MS MOUSE v7.05+ - GET CURRENT MINIMUM/MAXIMUM VIRTUAL COORDINATES
    AX = 0031h
Return: AX = virtual X minimum
    BX = virtual Y minimum
    CX = virtual X maximum
    DX = virtual Y maximum
Note:    the minimum and maximum values are those set by AX=0007h and AX=0008h;
      the default is minimum = 0 and maximum = absolute maximum
      (see AX=0026h)
SeeAlso: AX=0007h,AX=0008h,AX=0010h,AX=0026h
--------M-330032-----------------------------
INT 33 - MS MOUSE v7.05+ - GET ACTIVE ADVANCED FUNCTIONS
    AX = 0032h
Return: AX = active function flags (FFFFh for v8.10)
        bit 15: function 0025h supported
        bit 14: function 0026h supported
        ...
        bit 0:  function 0034h supported
    BX = ??? (0000h) officially unused
    CX = ??? (E000h) officially unused
    DX = ??? (0000h) officially unused
Note:    the Italian version of MS MOUSE v8.20 reportedly indicates that
      functions 0033h and 0034h are not supported even though they are
--------M-330033-----------------------------
INT 33 - MS MOUSE v7.05+ - GET SWITCH SETTINGS AND ACCELERATION PROFILE DATA
    AX = 0033h
    CX = size of buffer
        0000h get required buffer size
        Return: AX = 0000h
            CX = required size (0154h for Logitech v6.10, 0159h
                for MS v8.10-8.20)
        other
        ES:DX -> buffer of CX bytes for mouse settings
        Return: AX = 0000h
            CX = number of bytes returned
            ES:DX buffer filled (see #03182)
SeeAlso: AX=002Bh

Format of mouse settings data buffer:
Offset    Size    Description    (Table 03182)
 00h    BYTE    mouse type
 01h    BYTE    current language
 02h    BYTE    horizontal sensitivity (00h-64h)
 03h    BYTE    vertical sensitivity (00h-64h)
 04h    BYTE    double-speed threshold (00h-64h)
 05h    BYTE    ballistic curve (01h-04h)
 06h    BYTE    interrupt rate (01h-04h)
 07h    BYTE    cursor override mask
 08h    BYTE    laptop adjustment
 09h    BYTE    memory type (00h-02h)
 0Ah    BYTE    SuperVGA support (00h,01h)
 0Bh    BYTE    rotation angle
 0Ch    BYTE    ???
 0Dh    BYTE    primary button (01h-04h)
 0Eh    BYTE    secondary button (01h-04h)
 0Fh    BYTE    click lock enabled (00h,01h)
 10h 324 BYTEs    acceleration profile data (see #03180)
154h  5 BYTEs    ??? (Microsoft driver, but not Logitech)
--------M-330034-----------------------------
INT 33 - MS MOUSE v8.0+ - GET INITIALIZATION FILE
    AX = 0034h
Return: AX = status (0000h successful)
    ES:DX -> ASCIZ initialization (.INI) file name
--------M-330035-----------------------------
INT 33 - MS MOUSE v8.10+ - LCD SCREEN LARGE POINTER SUPPORT
    AX = 0035h
    BX = function
        FFFFh get current settings
        Return: AX = 0000h
            BH = style (see #03183)
            BL = size (see #03184)
            CH = threshold (00h-64h)
            CL = active flag (00h disabled, 01h enabled)
            DX = delay
        other
        BH = pointer style (see #03183)
        BL = size (see #03184)
        CH = threshold (00h-64h)
        CL = active flag (00h disable size change, 01h enable)
        DX = delay (0000h-0064h)
        Return: AX = 0000h
Note:    not supported by Logitech driver v6.10
SeeAlso: AX=0012h,AX=002Ah

(Table 03183)
Values for pointer style:
 00h    normal
 01h    reverse
 02h    transparent
SeeAlso: #03184

(Table 03184)
Values for pointer size:
 00h    small ("1")
 01h    medium ("1.5")
 02h    large ("2")
SeeAlso: #03183
--------M-330042-----------------------------
INT 33 - PCMOUSE - GET MSMOUSE STORAGE REQUIREMENTS
    AX = 0042h
Return: AX = status
        0000h MSMOUSE not installed
        0042h functions 42h, 50h, and 52h not supported
        FFFFh successful
        BX = buffer size in bytes for functions 50h and 52h
Note:    this function is also supported by the Genius Mouse 9.06 driver
SeeAlso: AX=0015h,AX=0050h,AX=0052h
--------M-330043-----------------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - CONFIGURE MOUSE???
    AX = 0043h
    CX:BX -> configuration buffer (see #03185)
    DL = ???
Return: ???
Notes:    also calls routines for INT 33/AX=0053h and INT 33/AX=004Fh
    this function is also supported by the Genius Mouse 9.06 driver

Format of Mouse Systems configuration buffer:
Offset    Size    Description    (Table 03185)
 00h    WORD    I/O port address
 02h    BYTE    ???
 03h    BYTE    interrupt number
 04h    BYTE    interrupt mask for interrupt controller
 05h  5 BYTEs    ???
--------M-330044CXCDEF-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - TOGGLE IGNORE ACCELERATION CMDS
    AX = 0044h
    CX = CDEFh
Return: AX = new state of "Ignore Application Acceleration Commands" flag
Note:    this function is also supported by the Genius Mouse 9.06 driver
SeeAlso: AX=0045h
--------M-330045CXCDEF-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - TOGGLE RESOLUTION DOUBLING
    AX = 0045h
    CX = CDEFh
Return: AX = new state of resolution doubling flag
Note:    this function is also supported by the Genius Mouse 9.06 driver
SeeAlso: AX=0044h
--------M-330047-----------------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - SET BUTTON ASSIGNMENTS
    AX = 0047h
    ES:BX -> button assignments (3 bytes, combinations of "L", "M", "R")
Return: ???
Note:    also supported by Genius Mouse 9.06 driver
SeeAlso: AX=0067h
--------M-330048BXCDEF-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - GET ???
    AX = 0048h
    BX = CDEFh
Return: CX = ???
    BH = ???
    BL = ??? (if 50h, driver is using PS/2 pointing device BIOS interface)
Note:    also supported by Genius Mouse 9.06 driver
--------M-33004B-----------------------------
INT 33 - LCS/Telegraphics MOUSE DRIVERS - INSTALLATION CHECK / GET VERSION
    AX = 004Bh
Return: ES:DI -> ASCIZ signature/description string if installed (see #03186)

(Table 03186)
Values for LCS/Telegraphics mouse driver OEM signature/description string:
 "Primax Generic;Universal Mouse Driver;IMOUSE;v8.20i"
 "Synaptics;TouchPad Driver;SYNTOUCH;v2.26"
 "Z-NIX;BUS,AUX,Serial 3-byte and 5-byte Mouse Driver;ZMOUSE;v7.04d"
Note:    the string consists of OEM, driver description, driver name, and
      version number
--------M-33004CBXCDEF-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - SET ??? FLAG
    AX = 004Ch
    BX = CDEFh
Note:    also supported by Genius Mouse 9.06
SeeAlso: AX=006Ch
--------M-33004D-----------------------------
INT 33 - MS MOUSE - RETURN POINTER TO COPYRIGHT STRING
    AX = 004Dh
Return: ES:DI -> copyright message "*** This is Copyright 1983 Microsoft" or
        "Copyright 19XX...."
Notes:    also supported by Logitech, Kraft, Genius Mouse, and Mouse Systems
      mouse drivers
    in the Genius Mouse 9.06 driver, the ASCIZ signature "KYE" immediately
      follows the above copyright message (KYE Corp. manufactures the
      driver)
SeeAlso: AX=0024h,AX=006Dh,AX=0666h
--------M-33004F-----------------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - ENABLE MOUSE
    AX = 004Fh
Return: nothing
Note:    also supported by Genius Mouse 9.06
SeeAlso: AX=0043h,AX=0053h
--------M-330050-----------------------------
INT 33 - PCMOUSE - SAVE MSMOUSE STATE
    AX = 0050h
    BX = buffer size (ignored by some driver versions)
    ES:DX -> buffer
Return: AX = FFFFh if successful
Notes:    the buffer must be large enough to hold the entire state, or following
      data will be overwritten by state data in versions which ignore BX;
      use INT 33/AX=0042h to get the required size
    this function is also supported by the Genius Mouse 9.06 driver
SeeAlso: AX=0042h,AX=0052h
--------M-330052-----------------------------
INT 33 - PCMOUSE - RESTORE MSMOUSE STATE
    AX = 0052h
    BX = buffer size (ignored by some driver versions)
    ES:DX -> buffer
Return: AX = FFFFh if successful
Note:    also supported by Genius Mouse 9.06 driver
SeeAlso: AX=0050h
--------M-330053-----------------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - DISABLE MOUSE
    AX = 0053h
Return: nothing
Note:    also supported by Genius Mouse 9.06
SeeAlso: AX=0043h,AX=004Fh
--------M-330054CXCDEF-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - SELECT ULTRARES ACCELERATION LEVEL
    AX = 0054h
    CX = CDEFh
    BX = new acceleration level (0-9)
Return: ???
Note:    this function is also supported by the Genius Mouse 9.06 driver
SeeAlso: AX=005Ah
--------M-330055-----------------------------
INT 33 - Kraft Mouse - GET ???
    AX = 0055h
Return: CX = ???
    DX = ???
    ES = ???
--------M-330058-----------------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - ???
    AX = 0058h
Return: AX = CS of driver
    CX:BX = original INT 33 vector
    DX = ???
Note:    this function is also supported by the Genius Mouse 9.06 driver
--------M-33005A-----------------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - SET ULTRARES ACCELERATIONS
    AX = 005Ah
    CX = number of WORDs to copy (max 0014h, but not range-checked)
    DX:SI -> buffer containing thresholds??? (CX words)
    DX:BX -> buffer containing acceleration values???
        (9*14h words, only first CX of each 14h used)
    ???
Return: CF clear
    ???
Note:    this function is also supported by Genius Mouse 9.06
SeeAlso: AX=0054h
--------M-330061BXCDEF-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - ???
    AX = 0061h
    BX = CDEFh
Return: CX = ???
Note:    also supported by Genius Mouse 9.06
--------M-330067-----------------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - GET MOUSE BUTTONS???
    AX = 0067h
Return: BL = number of buttons???
Note:    also supported by Genius Mouse 9.06
SeeAlso: AX=0047h
--------M-33006A-----------------------------
INT 33 U - ATI Mouse - INSTALLATION CHECK
    AX = 006Ah
Return: AL = AAh
    AH = ???
    BH = ???
    BL = ???
    CL = ???
    CH = ???
Program: ATI's MOUSE.COM and MOUSE.SYS are drivers for the mouse port found on
      some of ATI's video adapters
SeeAlso: AX=006Dh
--------M-33006C-----------------------------
INT 33 U - TRUEDOX Mouse driver v4.01 - GET/SET HARDWARE PARAMETERS
    AX = 006Ch
    BX = new IRQ (0003h or 0004h), or 0000h to get current values only
    CL = new IRQmask (sent to 8259)
    DX = new base I/O port
Return: BX = current IRQ
    DX = light pen state???
Note:    this is the mouse driver for the Dell Dimension series of computers, by
      TRUEDOX Technology Corporation
SeeAlso: AX=00A1h,AX=0666h
--------M-33006CBXCDEF-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - CLEAR ??? FLAG
    AX = 006Ch
    BX = CDEFh
Note:    also supported by Genius Mouse 9.06
SeeAlso: AX=004Ch
--------M-33006D-----------------------------
INT 33 - MS MOUSE - GET VERSION STRING
    AX = 006Dh
Return: ES:DI -> Microsoft version number of resident driver (see #03187)
Notes:    also supported by Logitech, Mouse Systems, Kraft, and Genius mouse
      drivers
    the Mouse Systems 7.01 and Genius Mouse 9.06 drivers report their
      Microsoft version as 7.00 even though they do not support any of the
      functions from 0025h through 002Dh supported by the MS 7.00 driver
      (the Genius Mouse driver supports function 0026h, but it differs
      from the Microsoft function)
    the TRUEDOX 4.01 driver reports its version as 6.26 through this call,
      but as 6.24 through AX=0024h
SeeAlso: AX=0024h,AX=004Dh,AX=006Ah,AX=266Ch

Format of Microsoft version number:
Offset    Size    Description    (Table 03187)
 00h    BYTE    major version
 01h    BYTE    minor version (BCD)
--------M-330070BXABCD-----------------------
INT 33 - Mouse Systems MOUSE DRIVER - POPUP.COM - INSTALLATION CHECK
    AX = 0070h
    BX = ABCDh
Return: AX = ABCDh if installed
        BX:CX -> data structure (see #03188)
Notes:    this function is also supported by the Genius Mouse 9.06 driver
    the v7.01 POPUP.COM and menu drivers also check for the signature
      CDh ABh BAh DCh at offset -2Ch from the interrupt handler
    if POPUP is not loaded, the returned data structure contains the proper
      signature at offset 00h, but not at offset 08h

Format of Mouse Systems POPUP.COM data structure:
Offset    Size    Description    (Table 03188)
 00h    WORD    signature ABCDh
 02h    DWORD    pointer to info structure??? (see #03189)
 06h  2 BYTEs    ???
 08h    WORD    signature ABCDh

Format of Mouse Systems POPUP.COM info structure:
Offset    Size    Description    (Table 03189)
 00h    WORD    driver version
 02h  8 BYTEs    ???
 0Ah    WORD    segment of ???
    ???
--------M-330072BXABCD-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - ???
    AX = 0072h
    BX = ABCDh
Return: ???
Note:    this function is also supported by the Genius Mouse 9.06 driver
--------M-330073BXCDEF-----------------------
INT 33 - Mouse Systems MOUSE DRIVER v7.01+ - GET BUTTON ASSIGNMENTS
    AX = 0073h
    BX = CDEFh
    ES:DX -> 3-byte buffer for button assignments
Return: CX = number of buttons???
    ES:DX buffer filled (default is "LMR")
Note:    also supported by Genius Mouse 9.06
SeeAlso: AX=0067h
--------M-3300A0-----------------------------
INT 33 U - TRUEDOX Mouse driver - SET HARDWARE PC MODE (3 button)
    AX = 00A0h
Return: nothing
Note:    this function is only available if the mouse mode is switchable
      through the power pins
SeeAlso: AX=006Ch"TRUEDOX",AX=00A1h"TRUEDOX"
--------M-3300A1-----------------------------
INT 33 U - TRUEDOX Mouse driver - SET HARDWARE MS MODE (2 button)
    AX = 00A1h
Return: nothing
Notes:    this function is only available if the mouse mode is switchable
      through the power pins
    this is the mouse driver for the Dell Dimension series of computers, by
      TRUEDOX Technology Corporation
SeeAlso: AX=006Ch"TRUEDOX",AX=00A0h"TRUEDOX",AX=00A6h,AX=0666h
--------M-3300A6-----------------------------
INT 33 U - TRUEDOX Mouse driver - SET RESOLUTION
    AX = 00A6h
    BX = new software resolution
        0001h 50-200 dpi
        0002h 200-400 dpi
        0003h 400-800 dpi
Note:    this is the mouse driver for the Dell Dimension series of computers, by
      TRUEDOX Technology Corporation
SeeAlso: AX=00A0h,AX=00A1h,AX=0666h
--------M-3300B0-----------------------------
INT 33 U - LCS/Telegraphics MOUSE DRIVERS - ???
    AX = 00B0h
    ???
Return: ???
--------M-3300D6-----------------------------
INT 33 - Twiddler TWMOUSE - GET BUTTON/TILT STATE
    AX = 00D6h
Return: AX = current button bitmap
    BX = current X tilt (approximately -200..+200 = -90degrees..+90deg.)
    CX = current Y tilt
Program: the Twiddler is a chording keyboard/mouse combination by Handykey
      Corporation
--------M-3300F0-----------------------------
INT 33 U - LCS/Telegraphics MOUSE DRIVERS - ???
    AX = 00F0h
    ???
Return: ???
--------M-3300F1-----------------------------
INT 33 U - LCS/Telegraphics MOUSE DRIVERS - ???
    AX = 00F1h
    ???
Return: ???
--------M-3300F2-----------------------------
INT 33 U - LCS/Telegraphics MOUSE DRIVERS - ???
    AX = 00F2h
    ???
Return: ???
--------M-3300F3-----------------------------
INT 33 U - LCS/Telegraphics MOUSE DRIVERS - ???
    AX = 00F3h
    ???
Return: ???
--------M-330100CX4752-----------------------
INT 33 - GRTMOUSE v1.00+ - INSTALLATION CHECK
    AX = 0100h
    CX = 4752h ('GR')
    DX = 544Dh ('TM')
Return: AX = 474Dh ('GM') if installed
        CX = version number (CH = major, CL = minor)
Program: GRTMOUSE is a graphical-cursor driver for textmode by Tommer Leyvand
SeeAlso: AX=0101h,AX=0102h,AX=0103h,AX=0104h
--------M-330101-----------------------------
INT 33 - GRTMOUSE v1.00+ - SET MOUSE CURSOR SHAPE
    AX = 0101h
    DS:SI -> 16-byte cursor pattern
Return: CF clear if successful
SeeAlso: AX=0100h,AX=0102h
--------M-330102-----------------------------
INT 33 - GRTMOUSE v1.00+ - GET MOUSE CURSOR SHAPE
    AX = 0102h
    ES:DI -> 16-byte buffer for cursor pattern
SeeAlso: AX=0100h,AX=0101h
--------M-330103-----------------------------
INT 33 - GRTMOUSE v1.00+ - SET ACTIVE CHARACTERS
    AX = 0103h
    CH,CL,DH,DL = ASCII codes to be remapped to display mouse pointer
Note:    the default active characters are D0h,D1h,D6h,D8h; the active
     characters should be in the range C0h to DFh
SeeAlso: AX=0100h,AX=0104h
--------M-330104-----------------------------
INT 33 - GRTMOUSE v1.00+ - GET ACTIVE CHARACTERS
    AX = 0104h
Return: CH,CL,DH,DL = ASCII codes for the active characters
SeeAlso: AX=0100h,AX=0103h
--------M-33012E-----------------------------
INT 33 - MS MOUSE v8.10+ - ???
    AX = 012Eh
    BL = ???
Return: AX = 0000h (MS)
    AX = FFFFh (ATI Mouse v7.04)
Note:    not supported by Logitech driver v6.10
SeeAlso: AX=002Eh,AX=022Eh
--------M-33022E-----------------------------
INT 33 - MS MOUSE v8.10+ - ???
    AX = 022Eh
    BL = ???
Return: AX = 0000h (MS)
    AX = FFFFh (ATI Mouse v7.04)
Note:    not supported by Logitech driver v6.10
SeeAlso: AX=002Eh,AX=012Eh
--------M-330666-----------------------------
INT 33 U - TRUEDOX Mouse driver v4.01 - GET COPYRIGHT STRING
    AX = 0666h
Return: DX:AX -> ASCII "Copyright 1987-1992 TRUEDOX Technology Corporation"
Note:    this is the mouse driver for the Dell Dimension series of computers,
      by TRUEDOX Technology Corporation
SeeAlso: AX=004Dh,AX=00A6h,AX=0666h
--------M-33136C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - ???
    AX = 136Ch
    BX = ???
Return: AX = ???
    BX = ???
--------M-33146C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - GET/SET ???
    AX = 146Ch
    BL = function
        00h set ???
        BH = new value (zero/nonzero to clear/set)
        else get ???
        Return: ???
--------M-33156C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - GET SIGNATURE AND VERSION STRINGS
    AX = 156Ch
Return: ES:DI -> signature "LOGITECH MOUSE DRIVER"
    ES:SI -> version string, terminated with CRLF
--------M-33166C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - ???
    AX = 166Ch
    BL = ???
        00h ???
        01h ???
        other ???
        BH = new value of ???
        Return: AX = FFFFh
--------M-33176C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - ???
    AX = 176Ch
    ???
Return: ???
--------M-33186C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - ???
    AX = 186Ch
    ???
Return: ???
--------M-33196C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - ???
    AX = 196Ch
    ???
Return: ???
--------M-331A6C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - GET ???
    AX = 1A6Ch
Return: AX = FFFFh
    BX = ???
    CX = ???
SeeAlso: AX=1B6Ch
--------M-331B6C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - SET ???
    AX = 1B6Ch
    BX = new value for ??? (0000h-0003h)
Return: AX = FFFFh
SeeAlso: AX=1A6Ch
--------M-331C6C-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - ???
    AX = 1C6Ch
    BX = ???
        <42h ???
        =42h ???
        >42h ???
        ES:DI -> ???
        Return: AX = ???
--------M-331D6C-----------------------------
INT 33 - LOGITECH MOUSE - GET COMPASS PARAMETER
    AX = 1D6Ch
Return: BX = direction (0=north, 1=south, 2=east, 3=west)
SeeAlso: AX=1E6Ch
--------M-331E6C-----------------------------
INT 33 - LOGITECH MOUSE - SET COMPASS PARAMETER
    AX = 1E6Ch
    BX = direction (0=north, 1=south, 2=east, 3=west)
SeeAlso: AX=1D6Ch
--------M-331F6C-----------------------------
INT 33 - LOGITECH MOUSE - GET BALLISTICS INFORMATION
    AX = 1F6Ch
Return: BX = 0=off, 1=on
    CX = 1=low, 2=high
SeeAlso: AX=002Ch,AX=236Ch
--------M-33206C-----------------------------
INT 33 - LOGITECH MOUSE - SET LEFT OR RIGHT PARAMETER
    AX = 206Ch
    BX = parameter (00h = right, FFh = left)
SeeAlso: AX=216Ch
--------M-33216C-----------------------------
INT 33 - LOGITECH MOUSE - GET LEFT OR RIGHT PARAMETER
    AX = 216Ch
Return: BX = parameter (00h = right, FFh = left)
SeeAlso: AX=206Ch
--------M-33226C-----------------------------
INT 33 - LOGITECH MOUSE - REMOVE DRIVER FROM MEMORY
    AX = 226Ch
Note:    this only frees memory; does not restore hooked interrupts
--------M-33236C-----------------------------
INT 33 - LOGITECH MOUSE - SET BALLISTICS INFORMATION
    AX = 236Ch
    BX = 0=off, 1=on
    CX = 1=low, 2=high
SeeAlso: AX=002Ch,AX=1F6Ch
--------M-33246C-----------------------------
INT 33 - LOGITECH MOUSE - GET PARAMETERS AND RESET SERIAL MOUSE
    AX = 246Ch
    ES:DX -> parameter table buffer (see #03190)
Return: AX = FFFFh if driver installed for serial mouse
SeeAlso: AX=0000h,AX=256Ch/BX=0000h,AX=256Ch/BX=0001h,AX=256Ch/BX=0003h

Format of Logitech Mouse parameter table:
Offset    Size    Description    (Table 03190)
 00h    WORD    baud rate divided by 100  (serial mouse only)
 02h    WORD    emulation          (serial mouse only)
 04h    WORD    report rate          (serial mouse only)
 06h    WORD    firmware revision      (serial mouse only)
 08h    WORD    00h              (serial mouse only)
 0Ah    WORD    port              (serial mouse only)
 0Ch    WORD    physical buttons
 0Eh    WORD    logical buttons
--------M-33256CBX0000-----------------------
INT 33 - LOGITECH MOUSE - SET PARAMETERS - SET BAUD RATE (SERIAL MOUSE ONLY)
    AX = 256Ch
    BX = 0000h
    CX = rate (0=1200, 1=2400, 2=4800, 3=9600)
Return: AX = FFFFh if driver installed for serial mouse
SeeAlso: AX=246Ch,AX=256Ch/BX=0001h,AX=256Ch/BX=0002h,AX=276Ch
--------M-33256CBX0001-----------------------
INT 33 - LOGITECH MOUSE - SET PARAMETERS - SET EMULATION (SERIAL MOUSE ONLY)
    AX = 256Ch
    BX = 0001h
    CX = emulation type (see #03191)
Return: AX = FFFFh if driver installed for serial mouse
SeeAlso: AX=246Ch,AX=256Ch/BX=0000h,AX=256Ch/BX=0003h,AX=276Ch

(Table 03191)
Values for Logitech mouse emulation type:
 00h    5 byte packed binary
 01h    3 byte packed binary
 02h    hexadecimal
 03h    relative bit pad
 04h    not supported
 05h    MM Series
 06h    not supported
 07h    Microsoft
--------M-33256CBX0002-----------------------
INT 33 - LOGITECH MOUSE - SET PARAMETERS - SET REPORT RATE (SERIAL MOUSE ONLY)
    AX = 256Ch
    BX = 0002h
    CX = rate (0=10, 1=20, 2=35, 3=50, 4=70, 5=100, 6=150)
Return: AX = FFFFh if driver installed for serial mouse
SeeAlso: AX=246Ch,AX=256Ch/BX=0001h,AX=256Ch/BX=0003h,AX=276Ch
--------M-33256CBX0003-----------------------
INT 33 - LOGITECH MOUSE - SET PARAMETERS - SET MOUSE PORT (SERIAL MOUSE ONLY)
    AX = 256Ch
    BX = 0003h
    CX = port (1, 2)
Return: AX = FFFFh if driver installed for serial mouse
SeeAlso: AX=246Ch,AX=256Ch/BX=0000h,AX=256Ch/BX=0004h,AX=276Ch
--------M-33256CBX0004-----------------------
INT 33 - LOGITECH MOUSE - SET PARAMETERS - SET MOUSE LOGICAL BUTTONS
    AX = 256Ch
    BX = 0004h
    CX = buttons (2, 3)
Return: AX = FFFFh if driver installed for serial mouse
SeeAlso: AX=246Ch,AX=276Ch
--------M-33266C-----------------------------
INT 33 - LOGITECH MOUSE - GET VERSION???
    AX = 266Ch
Return: BX = 'SS'
    CH = '4'  major version number
    CL = '1'  minor version number
SeeAlso: AX=006Dh
--------M-33276C-----------------------------
INT 33 - LOGITECH MOUSE - ??? Tries MMSeries, Baud 2400
    AX = 276Ch
SeeAlso: AX=256Ch
--------M-333000-----------------------------
INT 33 - Smooth Mouse Driver, PrecisePoint - INSTALLATION CHECK
    AX = 3000h
Return: AX = FFFFh if installed
        BX = version number (BH = major, BL = minor)
Program: SMD is a programmer's library by Andy Hakim which provides a
      graphics-style mouse cursor in text mode.  PrecisePoint is an
      SMD-based TSR which replaces the block mouse cursor in text
      applications.
SeeAlso: AX=0000h,AX=3001h,AX=3003h
--------M-333001-----------------------------
INT 33 - Smooth Mouse Driver, PrecisePoint - ENABLE SMOOTH MOUSE
    AX = 3001h
Return: AX = status (0000h = disabled, 0001h = enabled)
Note:    SMD remains disabled if running under Desqview or in graphics mode
SeeAlso: AX=0001h,AX=0002h,AX=3002h
--------M-333002-----------------------------
INT 33 - Smooth Mouse Driver, PrecisePoint - DISABLE SMOOTH MOUSE
    AX = 3002h
Return: AX = status (0000h = disabled, 0001h = enabled)
SeeAlso: AX=0001h,AX=0002h,AX=3000h,AX=3001h
--------M-333003-----------------------------
INT 33 - Smooth Mouse Driver, PrecisePoint - GET INFORMATION
    AX = 3003h
    BL = data structure selector
        00h Primary Bitmap (used for 25 line mode) (see #03192)
        01h Secondary Bitmap (used for 43/50 line modes) (see #03192)
        02h Sacrifice Character Map (see #03193)
        03h Program Information (see #03194)
Return: ES:DX -> selected data structure
SeeAlso: AX=3000h

Format of Primary/Secondary Bitmap [SMD_BITMAP_STRUCT]:
Offset    Size    Description    (Table 03192)
 00h    BYTE    vertical size of bitmap (00h - 10h)
 01h    BYTE    horizontal size of bitmap (00h - 10h)
 02h    BYTE    vertical hotspot position (00h - 10h)
 03h    BYTE    horizontal hotspot position (00h - 10h)
 04h 16 WORDs    cursor bitmap data
 14h 16 WORDs    screen bitmap data

Format of Sacrifice Character Map [SMD_SMAP_STRUCT]:
Offset    Size    Description    (Table 03193)
 00h    BYTE    bytes are character values (00h-FFh) used in place of the
 01h    BYTE    actual character for the corresponding position on the screen
 02h    BYTE         +--------------+      occupied by part or all of the mouse
 03h    BYTE         | 0h | 1h | 2h |      cursor
 04h    BYTE         |----+----+----|
 05h    BYTE         | 3h | 4h | 5h |
 06h    BYTE         |----+----+----|
 07h    BYTE         | 6h | 7h | 8h |
 08h    BYTE         +--------------+

Format of Program Information [SMD_INFO_STRUCT]:
Offset    Size    Description    (Table 03194)
 00h    WORD    segment of old interrupt 33h handler
 02h    WORD    offset of old interrupt 33h handler
 04h    WORD    PSP of SMD
 06h    BYTE    ENABLE/DISABLE manual setting status
 07h    BYTE    ENABLE/DISABLE internal usage status
--------M-333004-----------------------------
INT 33 - Smooth Mouse Driver, PrecisePoint - RESERVED FUTURE EXPANSION
    AX = 3004h
SeeAlso: AX=3000h
--------M-333005-----------------------------
INT 33 - Smooth Mouse Driver, PrecisePoint - RESERVED FUTURE EXPANSION
    AX = 3005h
SeeAlso: AX=3000h
--------M-334F00-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - GET ???
    AX = 4F00h
Return: AX = 004Fh if supported
    BX = ???
    ES:DI -> ???
SeeAlso: AX=4F01h
--------M-334F01-----------------------------
INT 33 - LOGITECH MOUSE v6.10+ - ???
    AX = 4F01h
    ES = ???
Return: AX = 004Fh if supported
    ES:DI -> ???
SeeAlso: AX=4F00h
--------M-336F00-----------------------------
INT 33 - Hewlett Packard - HP MOUSE DRIVER INSTALLATION CHECK
    AX = 6F00h
    BX <> 4850h
Return: BX = 4850h ('HP') if mouse driver written by Hewlett Packard
SeeAlso: INT 10/AX=6F00h,INT 14/AX=6F00h,INT 16/AX=6F00h,INT 17/AX=6F00h
--------M-338800-----------------------------
INT 33 U - InfoTrack IMOUSE.COM - UNHOOK MOUSE IRQ
    AX = 8800h
    BX <> FFFFh
Note:    the code is written to expect a subfunction number in AL, but only
      function 00h has been implemented
SeeAlso: AX=8800h/BX=FFFFh
--------M-338800BXFFFF-----------------------
INT 33 U - InfoTrack IMOUSE.COM - GET ACTIVE IRQ
    AX = 8800h
    BX = FFFFh
Return: BL = number of IRQ being used by the mouse
SeeAlso: AX=8800h
--------T-33FFE6-----------------------------
INT 33 - Switch-It v3.23 - GET ??? PROGRAM
    AX = FFE6h
    CX = length of buffer
    ES:DI -> buffer for program name
Return: ES:DI buffer filled
Program: Switch-It is a task switcher supporting up to 100 programs
      simultaneously by Better Software Technology, Inc.
--------T-33FFE7-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFE7h
Return: AX = ???
--------T-33FFE8-----------------------------
INT 33 - Switch-It v3.23 - ???
    AX = FFE8h
    CX = length of name including terminating NUL
    DS:SI -> ASCIZ program pathname
--------T-33FFE9-----------------------------
INT 33 - Switch-It v3.23 - SET ???
    AX = FFE9h
    BX = ???
--------T-33FFEA-----------------------------
INT 33 - Switch-It v3.23 - SET ???
    AX = FFEAh
    BL = ???
--------T-33FFEB-----------------------------
INT 33 - Switch-It v3.23 - SET ??? FLAG
    AX = FFEBh
--------T-33FFEC-----------------------------
INT 33 - Switch-It v3.23 - SET ???
    AX = FFECh
    BL = ???
--------T-33FFED-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFEDh
Return: AX = ??? (0001h)
    BX = ???
Program: Switch-It is a task switcher supporting up to 100 programs
      simultaneously by Better Software Technology, Inc.
--------T-33FFEE-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFEEh
Return: AX = ???
--------T-33FFEF-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFEFh
Return: BX:AX -> ???
--------T-33FFF0-----------------------------
INT 33 - Switch-It v3.23 - SET ???
    AX = FFF0h
    BL = ???
--------T-33FFF1-----------------------------
INT 33 - Switch-It v3.23 - GET CONFIGURATION FILE
    AX = FFF1h
Return: BX:AX -> ASCIZ pathname of configuration file
Program: Switch-It is a task switcher supporting up to 100 programs
      simultaneously by Better Software Technology, Inc.
--------T-33FFF2-----------------------------
INT 33 - Switch-It v3.23 - SET ??? FLAG
    AX = FFF2h
Return: AL = 01h
--------T-33FFF3-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFF3h
Return: AX = ???
--------T-33FFF4-----------------------------
INT 33 - Switch-It v3.23 - SET ???
    AX = FFF4h
    BX = ???
    CX = ???
--------T-33FFF5-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFF5h
Return: AX = ???
--------T-33FFF6-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFF6h
Return: AX = ???
--------T-33FFF7-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFF7h
    BX = index of ???
Return: AX = ???
--------T-33FFF8-----------------------------
INT 33 - Switch-It v3.23 - ???
    AX = FFF8h
    BX = ???
    CX = length of program name, including terminating NUL
    DS:SI -> ASCIZ program pathname
Return: ???
Program: Switch-It is a task switcher supporting up to 100 programs
      simultaneously by Better Software Technology, Inc.
--------T-33FFF9-----------------------------
INT 33 - Switch-It v3.23 - NOP
    AX = FFF9h
--------T-33FFFA-----------------------------
INT 33 - Switch-It v3.23 - SET ???
    AX = FFFAh
    BX = index of program
SeeAlso: AX=FFFBh,AX=FFFCh
--------T-33FFFB-----------------------------
INT 33 - Switch-It v3.23 - GET ???
    AX = FFFBh
    BX = index of program
Return: AX = ??? (0000h or 0001h)
SeeAlso: AX=FFFAh,AX=FFFCh
--------T-33FFFC-----------------------------
INT 33 - Switch-It v3.23 - CLEAR ???
    AX = FFFCh
    BX = index of program
SeeAlso: AX=FFFAh,AX=FFFCh
--------T-33FFFD-----------------------------
INT 33 - Switch-It v3.23 - GET MEMORY ADDRESSES???
    AX = FFFDh
Return: AX = first available segment???
    BX = paragraph of top of conventional memory
    DX = PSP segment of SI.EXE
--------T-33FFFE-----------------------------
INT 33 - Switch-It v3.23 - INSTALLATION CHECK
    AX = FFFEh
Return: BX = ???
    DX = 5349h ("SI")
--------T-33FFFF-----------------------------
INT 33 - Switch-It v3.23 - ???
    AX = FFFFh
    BX = ???
Program: Switch-It is a task switcher supporting up to 100 programs
      simultaneously by Better Software Technology, Inc.
--------r-34---------------------------------
INT 34 - FLOATING POINT EMULATION - OPCODE D8h
Desc:    this interrupt is used to emulate floating-point instructions with
      an opcode of D8h
Note:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
SeeAlso: INT 35,INT 3E
--------r-35---------------------------------
INT 35 - FLOATING POINT EMULATION - OPCODE D9h
Desc:    this interrupt is used to emulate floating-point instructions with
      an opcode of D9h
Note:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
SeeAlso: INT 34,INT 36
--------r-36---------------------------------
INT 36 - FLOATING POINT EMULATION - OPCODE DAh
Desc:    this interrupt is used to emulate floating-point instructions with
      an opcode of DAh
Note:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
SeeAlso: INT 35,INT 37
--------r-37---------------------------------
INT 37 - FLOATING POINT EMULATION - OPCODE DBh
Desc:    this interrupt is used to emulate floating-point instructions with
      an opcode of DBh
Note:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
SeeAlso: INT 36,INT 38
--------r-38---------------------------------
INT 38 - FLOATING POINT EMULATION - OPCODE DCh
Desc:    this interrupt is used to emulate floating-point instructions with
      an opcode of DCh
Note:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
SeeAlso: INT 37,INT 39
--------O-38---------------------------------
INT 38 - PC-MOS/386 v3.0 - API
Note:    this API was been moved to INT D4h sometime between versions 3.0 and
      5.01; v3.0 supported at least functions 02h,04h,0703h,10h,11h, and
      12h
SeeAlso: INT D4/AH=02h,INT D4/AH=04h,INT D4/AH=07h,INT D4/AH=10h,INT D4/AH=11h
--------r-39---------------------------------
INT 39 - FLOATING POINT EMULATION - OPCODE DDh
Desc:    this interrupt is used to emulate floating-point instructions with
      an opcode of DDh
Note:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
SeeAlso: INT 38,INT 3A
--------r-3A---------------------------------
INT 3A - FLOATING POINT EMULATION - OPCODE DEh
Desc:    this interrupt is used to emulate floating-point instructions with
      an opcode of DEh
Note:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
SeeAlso: INT 39,INT 3B
--------r-3B---------------------------------
INT 3B - FLOATING POINT EMULATION - OPCODE DFh
Desc:    this interrupt is used to emulate floating-point instructions with
      an opcode of DFh
Note:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
SeeAlso: INT 3A,INT 3C
--------r-3C---------------------------------
INT 3C - FLOATING POINT EMULATION - INSTRUCTIONS WITH SEGMENT OVERRIDE
Notes:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
    the generated code is  CD 3C xy mm ....
      where xy is a modified ESC instruction and mm is the modR/M byte.
      The xy byte appears to be encoded as
        s s 0 1 1 x x x      or    s s 0 0 0 x x x
      where "ss" specifies the segment override:
        00 -> DS:
        01 -> SS:
        10 -> CS:
        11 -> ES:
SeeAlso: INT 3B,INT 3D
--------r-3D---------------------------------
INT 3D - FLOATING POINT EMULATION - STANDALONE FWAIT
Notes:    the floating-point emulators in Borland and Microsoft languages and
      Lahey FORTRAN use this interrupt
    this vector is modified but not restored by Direct Access v4.0, and
      may be left dangling by other programs written with the same version
      of compiled BASIC
SeeAlso: INT 3C,INT 3E
--------r-3E---------------------------------
INT 3E - FLOATING POINT EMULATION - Borland LANGUAGES "SHORTCUT" CALL
Notes:    the two bytes following the INT 3E instruction are the subcode
      (see #03195) and a NOP (90h), except for subcodes DCh and DEh, where
      the second byte is a register count (01h-08h)
    this vector is modified but not restored by Direct Access v4.0, and
      may be left dangling by other programs written with the same version
      of compiled BASIC
SeeAlso: INT 3D

(Table 03195)
Values for Borland floating-point shortcut subcode:
Subcode        Function
 DCh    load 8086 stack with 8087 registers; overwrites the 10*N bytes at the
      top of the stack prior to the INT 3E with the 8087 register contents
 DEh    load 8087 registers from top of 8086 stack; ST0 is furthest from top
      of 8086 stack
 E0h    round TOS and R1 to single precision, compare, pop twice
      returns AX=8087 status word, FLAGS=8087 condition bits
 E2h    round TOS and R1 to double precision, compare, pop twice
      returns AX=8087 status word, FLAGS=8087 condition bits
    Note: buggy in TPas5.5, because it sets the 8087 precision control
      field to the undocumented value 01h; this results in actually
      rounding to single precision
 E4h    compare TOS/R1 with two POP's
      returns FLAGS=8087 condition bits
 E6h    compare TOS/R1 with POP
      returns FLAGS=8087 condition bits
 E8h    FTST (check TOS value)
      returns FLAGS=8087 condition bits
 EAh    FXAM (check TOS value)
      returns AX=8087 status word
 ECh    sine(ST0)
 EEh    cosine(ST0)
 F0h    tangent(ST0)
 F2h    arctangent(ST0)
 F4h    ST0 = ln(ST0)
 F6h    ST0 = log2(ST0)
 F8h    ST0 = log10(ST0)
 FAh    ST0 = e**ST0
 FCh    ST0 = 2**ST0
 FEh    ST0 = 10**ST0
--------r-3F---------------------------------
INT 3F - Overlay manager interrupt (Microsoft LINK.EXE, Borland TLINK VROOMM)
Notes:    INT 3F is the default, and may be overridden while linking
    this vector is modified but not restored by Direct Access v4.0, and
      may be left dangling by other programs written with the same version
      of compiled BASIC
SeeAlso: INT FE"OVERLAY"
--------r-3F---------------------------------
INT 3F - Microsoft Dynamic Link Library manager
SeeAlso: INT 21/AH=4Bh
--------B-40---------------------------------
INT 40 - DISKETTE - ROM BIOS DISKETTE HANDLER RELOCATED BY HARD DISK BIOS
SeeAlso: INT 13/AH=00h,INT 13/AH=02h,INT 47"SuperBIOS",INT 63"Adaptec"
--------h-40---------------------------------
INT 40 - Z100 - Master 8259 - Parity error or S100 error
SeeAlso: INT 41"Z100",INT FF"Z100"
--------O-40---------------------------------
INT 40 - Acorn BBC Master 512 - "OSFIND" - OPEN FILE
    AL = operation
        00h close file
        40h open file for reading
        80h open file for writing
        C0h open file for random access
    DS:BX -> CR-terminated filename
Return: AL = file handle (00h if file closed or could not be opened)
Note:    the Acorn BBC Master 512 is an 80186-based add-on board for the
      6502-based Master 128 which uses the original CPU as an I/O processor
SeeAlso: INT 41"Acorn",INT 42"Acorn",INT 43"Acorn",INT 44"Acorn",INT 4C"Acorn"
--------h-40---------------------------------
INT 40 - TI Professional PC - IRQ0
Note:    on the TI Pro, IRQ0 is connected to the same pin on the expansion bus
      that IBM connects to IRQ2
SeeAlso: INT 0A"IRQ2",INT 41"TI Professional"
--------B-41---------------------------------
INT 41 - SYSTEM DATA - HARD DISK 0 PARAMETER TABLE ADDRESS [NOT A VECTOR!]
Notes:    the default parameter table array is located at F000h:E401h in 100%
      compatible BIOSes; the pointer may be overridden by the hard disk
      controller's BIOS to support drive formats unknown to the ROM BIOS
    not used by some PS/2 models
    BIOSes which support four hard drives may store the parameter tables
      for drives 81h-83h immediately following the parameter table pointed
      at by INT 41, with a separate copy of the drive 81h table for INT 46.
      The check for such an arrangement is to test whether INT 46 points
      somewhere other than exactly 16 bytes past INT 41, and the sixteen
      bytes starting at offset 10h from INT 41 are identical to the sixteen
      bytes pointed at by INT 46
    another arrangement for BIOSes which support four IDE drives is to have
      four tables pointed at by INT 41 in the order primary master,
      primary slave, secondary master, and secondary slave, in which case
      (for example) a system with only primary master and secondary master
      will have valid tables at offsets 00h and 20h, with garbage (but
      sectors-per-track = 00h) at offsets 10h and 30h
SeeAlso: #03196,INT 13/AH=09h,INT 1E,INT 46"HARD DISK 1",INT 60"Adaptec"
SeeAlso: INT C0"AMI"

Format of fixed disk parameters:
Offset    Size    Description    (Table 03196)
 00h    WORD    number of cylinders
 02h    BYTE    number of heads
 03h    WORD    starting reduced write current cylinder (XT only, 0 for others)
 05h    WORD    starting write precompensation cylinder number
 07h    BYTE    maximum ECC burst length (XT only)
 08h    BYTE    control byte (see #03197,#03198)
 09h    BYTE    standard timeout (XT only, 0 for others)
 0Ah    BYTE    formatting timeout (XT and WD1002 only, 0 for others)
 0Bh    BYTE    timeout for checking drive (XT and WD1002 only, 0 for others)
 0Ch    WORD    cylinder number of landing zone (AT and later only)
 0Eh    BYTE    number of sectors per track (AT and later only)
 0Fh    BYTE    reserved
SeeAlso: #00273,#00277

Bitfields for XT fixed disk control byte:
Bit(s)    Description    (Table 03197)
 2-0    drive step speed
    000  3ms
    100  200ms
    101  70ms (default)
    110  3ms
    111  3ms
 5-3    unused
 6    disable ECC retries
 7    disable access retries

Bitfields for AT fixed disk control byte:
Bit(s)    Description    (Table 03198)
 0    unused
 1    reserved (0)  (disable IRQ)
 2    reserved (0)  (no reset)
 3    set if more than 8 heads
 4    always 0
 5    set if manufacturer's defect map on max cylinder+1  (AT and later only)
 6    disable ECC retries
 7    disable access retries
--------h-41---------------------------------
INT 41 - Z100 - Master 8259 - Processor Swap
SeeAlso: INT 40"Z100",INT 42"Z100"
--------h-41---------------------------------
INT 41 - TI Professional PC - IRQ1
Note:    on the TI Pro, IRQ1 is connected to the same pin on the expansion bus
      that IBM connects to IRQ3
SeeAlso: INT 0B"IRQ3",INT 40"TI Professional",INT 42"TI Professional"
--------O-41---------------------------------
INT 41 - Acorn BBC Master 512 - "OSGBPB" - MULTI-BYTE GET/PUT
    AL = function
        01h put bytes sequentially
        02h put bytes, ignoring sequential pointer
        03h get bytes sequentially
        04h get bytes, ignoring sequential pointer
        05h get media title and boot option
        06h get current device and directory
        07h get current library and device
        08h search directory
    DS:BX -> control block (see #03199)
Return: CF clear if successful
    CF set on error
    AL = 00h if operation attempted
    AL unchanged if unsupported function
SeeAlso: INT 40"Acorn",INT 42"Acorn",INT 43"Acorn"

Format of BBC Master control block:
Offset    Size    Description    (Table 03199)
 00h    BYTE    file handle
 01h    DWORD    pointer to data in either I/O processor or Tube processor
 05h    DWORD    number of bytes to be transferred
 09h    DWORD    transfer address
--------G-410000-----------------------------
INT 41 CPU - MS Windows debugging kernel - OUTPUT CHARACTER FOR USER
    AX = 0000h
    DS:DX -> character
Note:    the kernel calls this function when it wants the user program to
      output a character
SeeAlso: AX=0001h
--------G-410001-----------------------------
INT 41 CPU - MS Windows debugging kernel - INPUT CHARACTER
    AX = 0001h
Return: AL = character
Note:    the kernel calls this function when it needs to input a character
SeeAlso: AX=0000h
--------G-41000D-----------------------------
INT 41 CPU - MS Windows debugging kernel - TASK GOING OUT
    AX = 000Dh
SeeAlso: AX=000Eh
--------G-41000E-----------------------------
INT 41 CPU - MS Windows debugging kernel - TASK COMING IN
    AX = 000Eh
SeeAlso: AX=000Dh
--------G-410012-----------------------------
INT 41 CPU - MS Windows debugging kernel - "OutputDebugString"
    AX = 0012h
    DS:SI -> string (Windows 3.0)
    ES:SI -> string (Windows 3.1)
Return: nothing???
Note:    this function is called by the kernel when it wants to output a
      string through the debugger
SeeAlso: AX=0050h,INT 68/AH=47h
--------G-41004F-----------------------------
INT 41 CPU - MS Windows debugging kernel - DEBUGGER INSTALLATION CHECK
    AX = 004Fh
Return: AX = F386h if debugger is present
SeeAlso: INT 68/AX=4400h
--------G-410050-----------------------------
INT 41 P - MS Windows debugging kernel - "DefineDebugSegment"
    AX = 0050h
    BX = segment number in executable (0-based)
    CX = selector
    DX = instance handle
    SI = segment flags (0=code, 1=data)
    ES:DI -> module name of owner
Return: ???
SeeAlso: AX=0012h,AX=004Fh
--------G-410051-----------------------------
INT 41 CPU - MS Windows debugging kernel - MOVE SEGMENT
    AX = 0051h
    ???
Return: ???
SeeAlso: AX=0050h,AX=0052h
--------G-410052-----------------------------
INT 41 CPU - MS Windows debugging kernel - FREE SEGMENT
    AX = 0052h
    BX = freed selector
SeeAlso: AX=0050h,AX=0051h,AX=005Ch
--------G-410059-----------------------------
INT 41 CPU - MS Windows debugging kernel - LOAD TASK
    AX = 0059h
    ???:BX = CS:IP of new task's starting point
--------G-41005C-----------------------------
INT 41 CPU - MS Windows debugging kernel - FREE INITIAL SEGMENT
    AX = 005Ch
    BX = freed selector
Note:    called only when KERNEL starts, once for CS and once for the DS alias
      to CS
SeeAlso: AX=0052h
--------G-410060-----------------------------
INT 41 CPU - MS Windows debugging kernel -  END OF SEGMENT LOAD
    AX = 0060h
    ???
Return: ???
SeeAlso: AX=0061h
--------G-410061-----------------------------
INT 41 CPU - MS Windows debugging kernel - END OF SEGMENT DISCARD
    AX = 0061h
    ???
Return: ???
SeeAlso: AX=0060h
--------G-410062-----------------------------
INT 41 CPU - MS Windows debugging kernel - APPLICATION TERMINATING
    AX = 0062h
STACK:    BYTE    exit code
Return: ???
    STACK unchanged???
SeeAlso: AX=0064h
--------G-410063-----------------------------
INT 41 CPU - MS Windows debugging kernel - ASYNCHRONOUS STOP (Ctrl-Alt-SysReq)
    AX = 0063h
--------G-410064-----------------------------
INT 41 CPU - MS Windows debugging kernel - DLL LOADED
    AX = 0064h
    CX:BX = DLL entry point CS:IP
    SI = module handle
SeeAlso: AX=0062h,AX=0065h
--------G-410065-----------------------------
INT 41 CPU - MS Windows debugging kernel - MODULE REMOVED
    AX = 0065h
    ES = module handle
SeeAlso: AX=0064h
--------G-410066-----------------------------
INT 41 CPU - MS Windows debugging kernel - ERROR
    AX = 0066h
Note:    called by LogError()
SeeAlso: AX=0067h
--------G-410067-----------------------------
INT 41 CPU - MS Windows debugging kernel - PARAMETER ERROR
    AX = 0067h
Note:    called by LogParamError()
SeeAlso: AX=0066h
--------V-42---------------------------------
INT 42 - VIDEO - RELOCATED DEFAULT INT 10 VIDEO SERVICES (EGA,VGA)
Desc:    contains the address of the original INT 10 handler which an EGA+
      video adapter replaces with its own on-board BIOS code
SeeAlso: INT 10/AH=00h,INT 10/AH=0Eh,INT 6D"VGA"
Note:    not used by PS/2 built-in VGA or XGA
--------h-42---------------------------------
INT 42 - Z100 - Master 8259 - Timer
SeeAlso: INT 41"Z100",INT 43"Z100"
--------h-42---------------------------------
INT 42 - TI Professional PC - IRQ2
Note:    on the TI Pro, IRQ0 is connected to the same pin on the expansion bus
      that IBM connects to IRQ4
SeeAlso: INT 0C"IRQ4",INT 41"TI Professional",INT 43"TI Professional"
--------b-42---------------------------------
INT 42 - Western Digital WD1002 SuperBIOS - INT 40 CASCADE
Note:    if the second WD1002 controller in the system finds INT 40 already in
      use, it uses this vector to cascade to the first controller's BIOS
SeeAlso: INT 40"DISKETTE",INT 47"SuperBIOS"
--------O-42---------------------------------
INT 42 - Acorn BBC Master 512 - "OSBPUT" - WRITE SINGLE BYTE TO FILE
    AL = byte to be written
    BH = file handle
Return: flags destroyed
SeeAlso: INT 40"Acorn",INT 41"Acorn",INT 43"Acorn",INT 47"Acorn",INT 49"Acorn"
--------V-425F33-----------------------------
INT 42 C - Chips & Technologies '65530' BIOS - MODE SET HOOK
    AX = 5F33h
    BL = current width in characters
    BH = curent video mode
    CH = active display page
Return:    nothing
Desc:    this function is called at the end of a video mode set
Note:    the OEM has the option of enabling or disabling this callout, as well
      as specifying whether the callout occurs on INT 15h or INT 42h
SeeAlso: INT 15/AX=5F31h,INT 15/AX=5F35h,INT 10/AX=5F50h,INT 15/AX=5F33h
--------V-427500-----------------------------
INT 42 U - Toshiba laptops - ???
    AX = 7500h
    BL = ??? (00h or 01h)
Return: ???
Note:    used by Toshiba utility VCHAD.EXE
SeeAlso: AX=7501h,AX=7503h
--------V-427501-----------------------------
INT 42 U - Toshiba laptop - GET ??? DATA
    AX = 7501h
    DS:DI -> data area to be filled ???
Return: area filled with data ???
Note:    used by Toshiba utility VCHAD.EXE
SeeAlso: AX=7500h,AX=7502h,AX=7503h
--------V-427502-----------------------------
INT 42 U - Toshiba laptops - SET ??? DATA
    AX = 7502h
    DS:DI -> data area ???
Return: ???
Note:    used by Toshiba utility VCHAD.EXE
SeeAlso: AX=7501h,AX=7503h
--------V-427503-----------------------------
INT 42 - Toshiba laptops - GET DISPLAY STATUS
    AX = 7503h
Return: AX = 7575h if supported
    CX = 0001h if supported
    BH = display type (00h color, 03h monochrome)
    BL = display state
        01h internal LCD display is active
        02h external VGA display is active
        03h both displays active / DeskStation display mode enabled
        (not possible on all machines)
Note:    used by VCHAD.EXE and supported by all Toshiba VGA laptops until about
      1994 (string "TOSHIBA " at F000:E010h should be checked before call)
    no longer supported by T21xx series, use INT 10/AX=5F50h instead
    INT 42 normally points to F000:F065h but may be redirected by QEMM386
SeeAlso: AX=7500h,AX=7504h,INT 10/AX=5F50h,INT 15/AH=C0h
--------V-427504-----------------------------
INT 42 U - Toshiba laptops - ???
    AX = 7504h
    BL = ???
Return: BH = ???
Note:    used by Toshiba utility VCHAD.EXE
SeeAlso: AX=7500h,AX=7503h
--------V-43---------------------------------
INT 43 - VIDEO DATA - CHARACTER TABLE (EGA,MCGA,VGA)
Desc:    points at graphics data for characters 00h-7Fh of the current font
      in 8x8 dot modes, graphics data for all characters in 8x14 and 8x16
      modes
Note:    this is not a callable vector!
SeeAlso: INT 06"no-name",INT 1F"SYSTEM DATA",INT 44"VIDEO"
--------h-43---------------------------------
INT 43 - Z100 - Master 8259 - Slave 8259 input
Note:    slave runs in special fully nested mode
SeeAlso: INT 42"Z100",INT 44"Z100"
--------h-43---------------------------------
INT 43 - TI Professional PC - IRQ3 - TIMER1 25ms INTERVAL INTERRUPT
SeeAlso: INT 0B"IRQ3",INT 42"TI Professional",INT 44"TI Professional"
SeeAlso: INT 58"TI Professional"
--------O-43---------------------------------
INT 43 - Acorn BBC Master 512 - "OSBGET" - READ SINGLE BYTE FROM FILE
    BH = file handle
Return: CF clear if successful
        AL = byte read from file
    CF set on error
SeeAlso: INT 40"Acorn",INT 41"Acorn",INT 42"Acorn",INT 46"Acorn"
--------V-44---------------------------------
INT 44 - VIDEO DATA - ROM BIOS CHARACTER FONT, CHARACTERS 00h-7Fh (PCjr)
Desc:    this vector points at graphics data for current character font
SeeAlso: INT 1F"SYSTEM DATA",INT 43"VIDEO"
--------N-44---------------------------------
INT 44 - Novell NetWare - HIGH-LEVEL LANGUAGE API
--------I-44---------------------------------
INT 44 - IBM 3270-PC High Level Language API
    DS:SI -> parameter control block
--------h-44---------------------------------
INT 44 - Z100 - Master 8259 - Serial A
SeeAlso: INT 43"Z100",INT 45"Z100"
--------h-44---------------------------------
INT 44 - TI Professional PC - IRQ4
Note:    on the TI Pro, IRQ4 is connected to the same pin on the expansion bus
      that IBM connects to IRQ5
SeeAlso: INT 0D"IRQ5",INT 43"TI Professional",INT 45"TI Professional"
--------v-44---------------------------------
INT 44 - VIRUS - "Lehigh" - ORIGINAL INT 21h VECTOR
SeeAlso: INT 32"VIRUS",INT 60"VIRUS",INT 70"VIRUS",INT 9E"VIRUS"
--------O-4400-------------------------------
INT 44 - Acorn BBC Master 512 - "OSARGS" - GET/SET FILE PARAMS FOR OPEN FILE
    AH = 00h
    AL = function
        00h get current filing system
        Return: AL = filing system (see #03200)
        01h get address of commandline tail
        Return: BX buffer filled with address of command tail in I/O
                  processor address space (use INT 4A/AL=05h to
                  retrieve)
        FFh flush all files onto secondary storage
    BX -> 4-byte data buffer
Note:    the commandline tail is terminated with a carriage return (0Dh)
SeeAlso: INT 40"Acorn",INT 45"Acorn"

(Table 03200)
Values for BBC Master filing system:
 00h    none
 01h    1200 bps cassette
 02h    300 bps cassette
 03h    ROM FS
 04h    DFS
 05h    ANFS/NFS
 06h    TFS
 08h    ADFS
--------O-44---------------------------------
INT 44 - Acorn BBC Master 512 - "OSARGS" - GET/SET FILE PARAMS FOR OPEN FILE
    AH = nonzero file handle
    AL = function
        00h get sequential pointer for file
        01h set sequential pointer for file
        02h get length of file
    BX -> 4-byte data buffer
Return: BX buffer updated if appropriate
SeeAlso: INT 40"Acorn",INT 41"Acorn",INT 44/AH=00h,INT 45"Acorn",INT 4A"Acorn"
--------h-45---------------------------------
INT 45 - Z100 - Master 8259 - Serial B
SeeAlso: INT 44"Z100",INT 46"Z100"
--------h-45---------------------------------
INT 45 - TI Professional PC - IRQ5
Note:    on the TI Pro, IRQ5 is connected to the same pin on the expansion bus
      that IBM connects to IRQ6
SeeAlso: INT 0E"IRQ6",INT 44"TI Professional",INT 46"TI Professional"
--------O-45---------------------------------
INT 45 - Acorn BBC Master 512 - "OSFILE" - READ/WRITE FILE OR DIRECTORY INFO
    AL = function
        00h save block of memory as file
        01h update directory entry for existing file
        02h set load address for existing file
        03h set execution address for existing file
        04h set attributes for existing file
        05h read directory
        06h delete file
        FFh load file
    DS:BX -> control block (see #03201)
Return: FLAGS destroyed
    AL = file type
        00h not found
        01h file found
        02h directory found
        FFh protected file
SeeAlso: INT 40"Acorn",INT 41"Acorn",INT 44"Acorn",INT 46"Acorn"

Format of BBC Master control block:
Offset    Size    Description    (Table 03201)
 00h    WORD    address of CR-terminated filename
 02h    DWORD    load address of file
 06h    DWORD    execution address of file
 0Ah    DWORD    start address of data to save
 0Eh    DWORD    end address of data to save, or file attributes
        file attributes in low byte (see #03202)
        other three bytes are filing-system specific file attributes

Bitfields for BBC Master file attributes:
Bit(s)    Description    (Table 03202)
 0    no owner read access
 1    no owner write access
 2    not executable by owner
 3    not deletable by owner
 4    no public read access
 5    no public write access
 6    not executable with public access
 7    not deletable with public access
--------B-46---------------------------------
INT 46 - SYSTEM DATA - HARD DISK 1 DRIVE PARAMETER TABLE ADDRESS [NOT A VECTOR!]
Note:    not used by some PS/2 models
SeeAlso: INT 13/AH=09h,INT 41"HARD DISK 0",INT 60"Adaptec",INT C0"AMI"
--------h-46---------------------------------
INT 46 - Z100 - Master 8259 - Keyboard, Retrace, and Light Pen
SeeAlso: INT 45"Z100",INT 47"Z100"
--------h-46---------------------------------
INT 46 - TI Professional PC - IRQ6 - FLOPPY DISK CONTROLLER
Note:    on the TI Pro, IRQ6 is connected to the same pin on the expansion bus
      that IBM connects to IRQ7
SeeAlso: INT 0F"IRQ7",INT 45"TI Professional",INT 47"TI Professional"
--------O-46---------------------------------
INT 46 - Acorn BBC Master 512 - "OSRDCH" - GET CHARACTER FROM CUR INPUT STREAM
Return: CF clear if successful
        AL = character read
    CF set on error
        AL = error code
SeeAlso: INT 40"Acorn",INT 43"Acorn",INT 47"Acorn",INT 49"Acorn"
--------h-47---------------------------------
INT 47 - Z100 - Master 8259 - Printer
SeeAlso: INT 46"Z100",INT 48"Z100"
--------h-47---------------------------------
INT 47 - TI Professional PC - IRQ7 - KEYBOARD USART
SeeAlso: INT 09"IRQ1",INT 46"TI Professional"
--------O-47---------------------------------
INT 47 - Acorn BBC Master 512 - "OSWRCH" - WRITE CHARACTER TO CUR OUTPUT STREAM
    AL = character to be written
Return: FLAGS destroyed
SeeAlso: INT 40"Acorn",INT 46"Acorn",INT 49"Acorn"
--------b-47---------------------------------
INT 47 - Western Digital WD1002-27X SuperBIOS - INT 40 CASCADE
Desc:    used by the second WD1002-27X controller to cascade to the first
      controller's INT 40
SeeAlso: INT 40"DISKETTE",INT 42"SuperBIOS",INT 48"SuperBIOS"
----------478000-----------------------------
INT 47 - SQL Base - DATABASE ENGINE API
    AX = 8000h
    DS:BX -> parameter block, first word is function number (see #03203)
Program: SQL Base is a network-oriented database engine by Gupta Technologies
SeeAlso: AX=8001h

(Table 03203)
Values for SQL Base function number:
 01h    "SQLFINI" initalialize application's use of the database
 02h    "SQLFDON" application is done using the database
 03h    "SQLFCON" connect to a cursor/database
 04h    "SQLFDIS" disconnect from a cursor/database
 05h    "SQLFCOM" compile a SQL command
 06h    "SQLFEXE" execute a SQL command
 07h    "SQLFCEX" compile and execute a SQL command
 08h    "SQLFCMT" commit a transaction to the database
 09h    "SQLFDES" describe the items of a SELECT statement
 0Ah    "SQLFGFI" get fetch information
 0Bh    "SQLFFBK" fetch previous result row from SELECT statement
 0Ch    "SQLFFET" fetch next result row from SELECT statement
 0Dh    "SQLFEFB" enable fetch backwards
 0Eh    "SQLFPRS" position in result set
 0Fh    "SQLFURS" undo result set
 10h    "SQLFNBV" get number of bind variables
 11h    "SQLFBND" bind data variables
 12h    "SQLFBNN" bind numerics
 13h    "SQLFBLN" bind long number
 14h    "SQLFBLD" bind long data variables
 15h    "SQLFSRS" start restriction set processing
 16h    "SQLFRRS" restart restriction set processing
 17h    "SQLFCRS" close restriction set
 18h    "SQLFDRS" drop restriction set
 19h    "SQLFARF" apply Roll Forward journal
 1Ah    "SQLFERF" end Roll Forward journal
 1Bh    "SQLFSRF" start Roll Forward journal
 1Ch    "SQLFSTO" store a compiled SQL command
 1Dh    "SQLFRET" retrieve a compiled SQL command
 1Eh    "SQLFDST" drop a stored command
 1Fh    "SQLFCTY" get command type
 20h    "SQLFEPO" get error position
 21h    "SQLFGNR" get number of rows
 22h    "SQLFNSI" get number of select items
 23h    "SQLFRBF" get Roll Back flag
 24h    "SQLFRCD" get return code
 25h    "SQLFROW" get number of ROWs
 26h    "SQLFSCN" set cursor name
 27h    "SQLFSIL" set isolation level
 28h    "SQLFSLP" set log parameters
 29h    "SQLFSSB" set select buffer
 2Ah    "SQLFSSS" set sort space
 2Bh    "SQLFRLO" read long
 2Ch    "SQLFWLO" write long
 2Dh    "SQLFLSK" long seek
 2Eh    "SQLFGLS" get long size
 2Fh    "SQLFELO" end long operation
 30h    "SQLFRBK" roll back a transaction from the database
 31h    "SQLFERR" error message
 32h    "SQLFCPY" copy
 33h    "SQLFR01" reserved
 34h    "SQLFSYS" system
 35h    "SQLFSTA" statistics
 36h    "SQLFR02" reserved
 37h    "SQLFXAD" extra add
 38h    "SQLFXCN" extra character to number
 39h    "SQLFXDA" extra date add
 3Ah    "SQLFXDP" extra date picture
 3Bh    "SQLFXDV" extra divide
 3Ch    "SQLFXML" extra multiply
 3Dh    "SQLFXNP" extra number picture
 3Eh    "SQLFXPD" extra picture date
 3Fh    "SQLFXSB" extra subtract
 40h    "SQLFINS" install database
 41h    "SQLFDIN" deinstall database
 42h    "SQLFDIR" directory of databases
 43h    "SQLFTIO" timeout
 44h    "SQLFFQN" get fully qualified column name
 45h    "SQLFEXP" explain execution plan
 46h    "SQLFFER" get full error
 47h    "SQLFBKP" begin online backup
 48h    "SQLFRDC" read backup data chunk
 49h    "SQLFEBK" end backup
 4Ah    "SQLFRES" begin restore from backup
 4Bh    "SQLFWDC" write backup data chunk for restore
 4Ch    "SQLFRRD" recover restored database to consistent state
 4Dh    "SQLFERS" end restore
 4Eh    "SQLFNRR" return number of result set rows
 4Fh    "SQLFSTR" start restriction mode
 50h    "SQLFSPR" stop restriction mode
 51h    "SQLFCNC" connect 2
 52h    "SQLFCNR" connect with no recovery
 53h    "SQLFOMS" set output message size
 54h    "SQLFIMS" set input message size
 55h    "SQLFSCP" set cache pages
 56h    "SQLFDSC" describe items of a SELECT statement (external)
 57h    "SQLFLAB" get label info for items in SELECT statement
 58h    "SQLFCBV" clear bind variables
 59h    "SQLFGET" get database information
 5Ah    "SQLFSET" set database information
 5Bh    "SQLFTEC" translate error code
----------478001-----------------------------
INT 47 - SQL Base - GET VERSION NUMBER
    AX = 8001h
Return: ???
Program: SQL Base is a network-oriented database engine by Gupta Technologies
SeeAlso: AX=8000h
--------B-48---------------------------------
INT 48 - KEYBOARD - CORDLESS KEYBOARD TRANSLATION (PCjr)
SeeAlso: INT 49"PCjr"
--------h-48---------------------------------
INT 48 - Z100 - Slave 8259 - S100 vectored line 0
SeeAlso: INT 47"Z100",INT 49"Z100"
--------N-48---------------------------------
INT 48 - Watstar PC Network data pointer 1
SeeAlso: INT 49"Watstar"
--------O-48---------------------------------
INT 48 - Acorn BBC Master 512 - "OSNEWL" - SEND NEWLINE TO OUTPUT STREAM
Return: FLAGS destroyed
Note:    writes a carriage return (0Dh) followed by a linefeed (0Ah)
SeeAlso: INT 40"Acorn",INT 47"Acorn",INT 49"Acorn"
--------b-48---------------------------------
INT 48 - Western Digital WD1002-27X SuperBIOS - DRIVE DATA (NOT A VECTOR!)
Note:    the second WD1002-27X controller in a system uses the low byte to
      store the number of drives controlled by the second controller,
      and the high word for temporary storage during track recalculation;
      the first controller uses offsets 74h-77h in the BIOS data area
      (refer to MEMORY.LST) to store data
SeeAlso: INT 47"SuperBIOS"
--------V-48---------------------------------
INT 48 U - Compaq UILIB.EXE - API
    AX = function (see #03204)
    BX = call type (0002h) (see #03207)
    ???
Return: ???
Note:    returns AX=FFFFh if 1000h<=AX<=2000h and AX is not one of the functions
      listed below
SeeAlso: AX=1A70h

(Table 03204)
Values for valid UILIB function number:
 1000h    1160h    12D0h    1430h    1570h    1680h    17F0h    1920h    1A90h
 1010h    1170h    12E0h    1440h    1578h    1690h    1800h    1930h    1AA0h
 1020h    1180h    12F0h    1450h    1580h    16A0h    1810h    1940h
 1030h    1190h    1300h    1460h    1590h    16B0h    1820h    1950h
 1040h    11A0h    1310h    1470h    1594h    16C0h    1830h    1960h
 1050h    11B0h    1320h    1480h    1598h    16D0h    1840h    1970h
 1060h    11C0h    1330h    1490h    15A0h    16E0h    1848h    1980h
 1070h    11D0h    1340h    14A0h    15B0h    16F0h    1850h    1990h
 1080h    11E0h    1350h    14B0h    15C0h    1700h    1860h    19A0h
 1090h    11F0h    1360h    14B8h    15D0h    1710h    1870h    19B0h
 1095h    1200h    1370h    14BBh    15D4h    1720h    1878h    19C0h
 1098h    1210h    1380h    14C0h    15D8h    1730h    1880h    19D0h
 10A0h    1220h    1390h    14D0h    15E0h    1735h    1890h    19E0h
 10C0h    1230h    13A0h    14E0h    15F0h    1740h    1898h    19F0h
 10D0h    1240h    13B0h    14F0h    1600h    1750h    18A0h    1A00h
 10E0h    1250h    13B8h    1500h    1610h    1770h    18B0h    1A10h
 10F0h    1260h    13C0h    1508h    1620h    1780h    18C0h    1A20h
 1100h    1270h    13D0h    1510h    1630h    1790h    18D0h    1A30h
 1110h    1280h    13E0h    1520h    1640h    17A0h    18E0h    1A40h
 1120h    1290h    13F0h    1530h    1650h    17B0h    18F0h    1A50h
 1130h    12A0h    1400h    1540h    1660h    17C0h    1900h    1A60h
 1140h    12B0h    1410h    1550h    1664h    17D0h    1909h    1A70h
 1150h    12C0h    1420h    1560h    1670h    17E0h    1910h    1A80h
--------b-4800-------------------------------
INT 48 - TI Professional PC - SPEAKER DEVICE - SOUND SPEAKER
    AH = 00h
    AL = number of 25ms ticks sound should last
Return: nothing
Desc:    sound the speaker at the current frequency setting (see AH=02h) for
      the indicated duration
Notes:    this function returns immediately; the sound is terminated by the
      timer interrupt handler
    if a new sound is requested while one is already in progress, the
      previous sound is terminated immediately and the new sound takes
      its place
SeeAlso: AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
SeeAlso: INT 40"TI Professional",INT 49/AH=01h"TI"
SeeAlso: INT 4A/AH=00h"TI",INT 4C"TI Professional",INT 4D/AH=00h
--------b-4801-------------------------------
INT 48 - TI Professional PC - SPEAKER DEVICE - CHECK SPEAKER STATUS
    AH = 01h
Return: ZF clear if speaker is currently on
    ZF set if speaker is currently off
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-4802-------------------------------
INT 48 - TI Professional PC - SPEAKER DEVICE - SET SPEAKER FREQUENCY
    AH = 02h
    CX = frequency divisor (freq = 1250000 / CX)
Return: nothing
SeeAlso: AH=00h,AH=01h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-4803-------------------------------
INT 48 - TI Professional PC - SPEAKER DEVICE - TURN ON SPEAKER
    AH = 03h
Return: nothing
Desc:    turn on the speaker at the current frequency, leaving it on until
      explicitly turned off with AH=04h or the end of a subsequent
      AH=00h
SeeAlso: AH=00h,AH=01h,AH=02h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-4804-------------------------------
INT 48 - TI Professional PC - SPEAKER DEVICE - TURN OFF SPEAKER
    AH = 04h
Return: nothing
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-4805-------------------------------
INT 48 - TI Professional PC - SPEAKER DEVICE - DELAY
    AH = 05h
    CX = desired delay in milliseconds
Return: after delay expires
Note:    the delay is only approximate, and may be longer than requested
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-4806-------------------------------
INT 48 - TI Professional PC - CALCULATE CRC
    AH = 06h
    ES:BX -> memory block for which to calculate CRC
    BP = size of block in bytes
Return: DX = CRC for block
    ZF set if DX = 0000h
Note:    if the CRC of a memory block is appended to the block, then the CRC
      of the block plus CRC should equal 0000h
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-4807-------------------------------
INT 48 - TI Professional PC - PRINT ROM MESSAGE
    AH = 07h
    SI = offset of ASCIZ message string within segment F400h
Return: nothing
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-4808-------------------------------
INT 48 - TI Professional PC - DISPLAY SYSTEM ERROR MESSAGE
    AH = 08h
    BX = error number
Return: nothing
Desc:    displays the error message " ** System Error ** - xxxx" where xxxx is
      the hexadecimal value in BX
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-4809-------------------------------
INT 48 - TI Professional PC - GET SYSTEM CONFIGURATION DATA
    AH = 09h
Return: ES:BX -> system configuration word (see #03227)
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
--------b-480A-------------------------------
INT 48 - TI Professional PC - GET EXTRA SYSTEM CONFIGURATION INFO ADDRESS
    AH = 0Ah
Return: ES:BX -> configuration information (see #03205)
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Bh

Format of TI Professional PC extra system configuration information:
Offset    Size    Description    (Table 03205)
 -3    WORD    memory size in paragraphs
 00h    BYTE    drive type byte (see #03206)
 01h    WORD    extra system configuration word 1
        bit 0: 8087 is present
        bits 15-1: reserved (0)
 03h    WORD    extra system configuration word 2
        bits 15-0: reserved (0)

Bitfields for TI Professional PC drive type byte:
Bit(s)    Description    (Table 03206)
 0    drive A is double-sided
 1    drive A has 80 tracks instead of 40
 2    drive B is double-sided
 3    drive B has 80 tracks instead of 40
 4    drive C is double-sided
 5    drive C has 80 tracks instead of 40
 6    drive D is double-sided
 7    drive D has 80 tracks instead of 40
Note:    the type for drive A is determined by motherboard switches; the
      remaining drives' types are set from a table in IO.SYS
SeeAlso: #03205
--------b-480B-------------------------------
INT 48 - TI Professional PC - GET EXTRA SYSTEM CONFIGURATION INFORMATION
    AH = 0Bh
Return: AL = drive type byte (see #03206)
    BX = extra system configuration word 1 (see #03205)
    CX = extra system configuration word 2 (see #03205)
    AH destroyed
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah
--------V-481A70-----------------------------
INT 48 U - Compaq UILIB.EXE - INSTALLATION CHECK
    AX = 1A70h
    BX = call type (see #03207)
Return: CX = 5649h ('VI') if installed
    DX = 4557h ('EW') if installed
        AX = version??? (0106h)

(Table 03207)
Values for UILIB call type:
 0000h    near
 0001h    far
 0002h    INT (only valid call type when using INT 48)
 0003h    near
--------B-49---------------------------------
INT 49 - SYSTEM DATA - NON-KEYBOARD SCAN-CODE TRANSLATION TABLE (PCjr)
SeeAlso: #03208,INT 48"PCjr"

Format of PCjr scan-code translation table:
Offset    Size    Description    (Table 03208)
 00h    BYTE    number of non-keyboard scancodes in the table
 01h  N WORDs    high byte 00h (NUL) byte scancode with low order byte
          representing the scancode mapped values relative to their
          input values within the range of 56h through 7Eh
--------h-49---------------------------------
INT 49 - Z100 - Slave 8259 - S100 vectored line 1
SeeAlso: INT 48"Z100",INT 4A"Z100"
--------N-49---------------------------------
INT 49 - Watstar PC Network data pointer 2
SeeAlso: INT 48"Watstar"
--------O-49---------------------------------
INT 49 - Acorn BBC Master 512 - "OSASCI" - WRITE CHARACTER TO CUR OUTPUT STREAM
    AL = character to be written
Return: FLAGS destroyed
Note:    converts carriage return (0Dh) into CRLF sequence (0Dh 0Ah)
SeeAlso: INT 40"Acorn",INT 46"Acorn",INT 47"Acorn",INT 48"Acorn"
--------b-49---------------------------------
INT 49 - Tandy 2000 - BOOTSTRAP LOADER
Note:    this interrupt is identical to INT 19
SeeAlso: INT 19,INT 4A"Tandy 2000",INT 4C"Tandy 2000",INT 51"Tandy 2000"
--------a-490001-----------------------------
INT 49 - MAGic v1.16+ - TURN ON MAGNIFICATION
    AX = 0001h
Return: AX = status (see #03209)
    BX,CX,DX destroyed
Program: MAGic (MAGnification In Color) is a TSR by Microsystems Software, Inc.
      providing 2x2 text and graphics magnification on VGA, XGA, and SVGA
Note:    INT 49 is the default, but may be overridden on the commandline.  The
      actual interrupt in use may be found by searching for the signature
      "MAGic" or "xMAGic" (for the deluxe version) immediately preceding
      the interrupt handler (this is also the installation check).    MAGic
      uses CodeRunneR, which places the signature "RT" at offset 0000h in
      the interrupt handler's segment, followed by MAGic's TSR ID of
      "VMAG".
SeeAlso: AX=0002h,AX=0003h,AX=0004h,AX=0008h
Index:    installation check;MAGic

(Table 03209)
Values for MAGic status:
 0000h    cannot magnify current video mode
 0002h    magnified (text mode)
 0003h    magnified (graphics mode)
 FFFDh    function works only in magnified mode
 FFFFh    MAGic busy, retry later
--------a-490002-----------------------------
INT 49 - MAGic v1.16+ - TURN OFF MAGNIFICATION
    AX = 0002h
Return: AX = status (see #03209)
    BX,CX,DX destroyed
SeeAlso: AX=0001h
--------a-490003-----------------------------
INT 49 - MAGic v1.16+ - SHIFT MAGNIFIED WINDOW TO INCLUDE SPECIFIED LOCATION
    AX = 0003h
    BX = vertical position (character row [text] or pixel row [graphics])
    DX = horizontal position (char column [text] or 8-pixel units [gr])
Return: AX = status
        0000h successful
        FFFFh MAGic busy, retry later
    BX,CX,DX destroyed
Note:    window is not moved if the position is inside the current window
SeeAlso: AX=0001h,AX=0004h,AX=0005h
--------a-490004-----------------------------
INT 49 - MAGic v1.16+ - REPOSITION MAGNIFIED WINDOW
    AX = 0004h
    BX = vertical position of upper left corner
    DX = horizontal position
Return: AX = status (see AX=0003h)
    BX,CX,DX destroyed
SeeAlso: AX=0001h,AX=0003h,AX=0005h
--------a-490005-----------------------------
INT 49 - MAGic v1.16+ - GET POSITION OF MAGNIFIED WINDOW
    AX = 0005h
Return: AX = status
        0000h successful
        BX = vertical position (char row or pixel row)
        DX = horizontal position (char column or 8-pixel units)
        FFFFh MAGic busy, retry later
        BX,DX destroyed
    CX destroyed
SeeAlso: AX=0001h,AX=0003h,AX=0004h,AX=0006h,AX=0007h
--------a-490006-----------------------------
INT 49 - MAGic v1.16+ - GET SIZE OF FULL SCREEN
    AX = 0006h
Return: AX = status
        0000h successful
        BX = vertical size (char rows or pixel rows)
        DX = horizontal size (char cols or 8-pixel units)
        FFFFh MAGic busy, retry later
        BX,DX destroyed
    CX destroyed
SeeAlso: AX=0001h,AX=0005h,AX=0007h
--------a-490007-----------------------------
INT 49 - MAGic v1.16+ - GET SIZE OF MAGNIFICATION WINDOW
    AX = 0007h
Return: AX = status
        0000h successful
        BX = vertical size (char rows or pixel rows)
        DX = horizontal size (char cols or 8-pixel units)
        FFFEh invalid function
        FFFFh MAGic busy, retry later
        BX,DX destroyed
    CX destroyed
BUG:    in v1.16 and v1.17, this function is not recognized as valid, but
      AX=0000h is accepted and will branch into hyperspace
SeeAlso: AX=0001h,AX=0006h
--------a-490008-----------------------------
INT 49 - MAGic v1.23+ - SET TEXT MODE MAGNIFICATION SIZE
    AX = 0008h
    BX = scaling factor (01h=1.4 times, 02h, 04h, 06h, 08h, 09h=12 times)
Return: AX = status
        0000h successful
        FFFBh scaling factor only available in MAGic Deluxe
        FFFCh already in magnified state, can't set size
Notes:    this call specifies the amount a subsequent call to AX=0001h should
      magnify the display
    scaling factors greater than 2 are only available in MAGic Deluxe
SeeAlso: AX=0001h
--------V-4901-------------------------------
INT 49 - TI Professional PC - CRT - SET CURSOR SIZE AND TYPE
    AH = 01h
    CH = cursor start line (bits 3-0) and status (bits 6-5)
        status bits:
        00 non-blinking cursor
        01 no cursor
        10 fast-blinking cursor
        11 slow-blinking cursor
    CL = cursor end line
Return: nothing
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=02h,AH=03h,INT 40"TI Professional",INT 48/AH=00h"TI Professional"
SeeAlso: INT 4A/AH=00h"TI",INT 4B"TI Professional",INT 4D/AH=00h
SeeAlso: INT 57"TI Professional"
--------V-4902-------------------------------
INT 49 - TI Professional PC - CRT - SET CURSOR POSITION
    AH = 02h
    DH = column
    DL = row
Return: DX destroyed
Notes:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
    the TI swaps the row and column compared to the equivalent IBM call
SeeAlso: AH=01h,AH=03h
--------V-4903-------------------------------
INT 49 - TI Professional PC - CRT - GET CURSOR POSTION AND TYPE
    AH = 03h
Return: CH = cursor start and status (see AH=01h)
    CL = cursor end line
    DH = cursor column
    DL = cursor row
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h
--------V-4906-------------------------------
INT 49 - TI Professional PC - CRT - SCROLL UP/COPY WINDOW
    AH = 06h
    AL = source blanking
        00h blank source region (move/scroll)
        nonzero do not blank source region (copy)
    DH,DL = source start column,row
    BH,BL = destination start column,row
    CH = width of region to move/copy
    CL = height of region to move/copy
Return: nothing
Notes:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
    the specified region may be wider than the screen, but reliable
      operation then requires that the height be exactly one row
SeeAlso: AH=01h,AH=02h,AH=07h,AH=13h,AH=14h
--------V-4907-------------------------------
INT 49 - TI Professional PC - CRT - SCROLL DOWN/COPY WINDOW
    AH = 07h
    AL = source blanking
        00h blank source region (move/scroll)
        nonzero do not blank source region (copy)
    DH,DL = source start column,row
    BH,BL = destination start column,row
    CH = width of region to move/copy
    CL = height of region to move/copy
Return: nothing
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=06h,AH=13h,AH=14h
--------V-4908-------------------------------
INT 49 - TI Professional PC - CRT - GET CHARACTER AND ATTRIBUTE AT POSITION
    AH = 08h
Return: AL = character at current cursor position
    AH = attribute
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=09h,AH=0Ah,AH=0Eh,INT 10/AH=08h
--------V-4909-------------------------------
INT 49 - TI Professional PC - CRT - WRITE CHARACTER(S) WITH ATTRIBUTE
    AH = 09h
    AL = character to write
    BL = attribute to use (becomes new current attribute)
    CX = number of times to write character
Return: nothing
Desc:    write CX copies of the character in AL beginning at the current cursor
      position
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=08h,AH=0Ah,AH=0Eh,INT 10/AH=09h
--------V-490A-------------------------------
INT 49 - TI Professional PC - CRT - WRITE CHARACTER(S) WITH CURRENT ATTRIBUTE
    AH = 0Ah
    AL = character to write
    CX = number of times to write character
Return: nothing
Desc:    write CX copies of the character in AL beginning at the current cursor
      position
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=08h,AH=09h,AH=0Eh,INT 10/AH=0Ah
--------V-490E-------------------------------
INT 49 - TI Professional PC - CRT - TTY OUTPUT
    AH = 0Eh
    AL = character to write
Return: nothing
Desc:    write the character in AL at the current cursor position, advancing
      the cursor, and interpreting CR, LF, TAB, and BEL characters
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=08h,AH=09h,AH=0Ah,INT 10/AH=0Eh
--------V-4910-------------------------------
INT 49 - TI Professional PC - CRT - WRITE BLOCK OF CHARACTERS WITH ATTRIBUTE
    AH = 10h
    AL = attribute (becomes new current attribute)
    DX:BX -> string of characters to write
    CX = length of string
Return: nothing
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
BUG:    CX must not be 0000h on entry, or the system will crash
SeeAlso: AH=01h,AH=02h,AH=09h,AH=0Eh,AH=11h
--------V-4911-------------------------------
INT 49 - TI Professional PC - CRT - WRITE BLOCK OF CHARACTERS WITH CURR ATTRIB
    AH = 11h
    DX:BX -> string of characters to write
    CX = length of string
Return: nothing
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
BUG:    CX must not be 0000h on entry, or the system will crash
SeeAlso: AH=01h,AH=02h,AH=09h,AH=0Eh,AH=10h
--------V-4912-------------------------------
INT 49 - TI Professional PC - CRT - FILL ENTIRE SCREEN WITH ATTRIBUTE
    AH = 12h
    AL = attribute (see #03210)
Return: nothing
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h

Bitfields for TI Professional PC screen attribute:
Bit(s)    Description    (Table 03210)
 7    alternate character set (requires user-supplied ROM)
 6    blink
 5    underline
 4    reverse video
 3    character enable
 2    green (color) or 58% intensity (gray-scale)
 1    red (color)  or 27.5% intensity
 0    blue (color) or 14.5% intensity
--------V-4913-------------------------------
INT 49 - TI Professional PC - CRT - CLEAR ENTIRE TEXT SCREEN AND HOME CURSOR
    AH = 13h
Return: nothing
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=06h,AH=14h
--------V-4914-------------------------------
INT 49 - TI Professional PC - CRT - CLEAR ENTIRE GRAPHICS SCREEN
    AH = 14h
Return: nothing
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=06h,AH=13h
--------V-4915-------------------------------
INT 49 - TI Professional PC - CRT - SET PROTECTED STATUS AREA
    AH = 15h
    CL = row at which to start status area, or 00h to cancel
    CH = 00h
Return: nothing
Desc:    set a protected area of the screen which will not be affected by TTY
      writes or the scrolls they may generate
Notes:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
    the current cursor position must be above the status area in order to
      set the protected area
SeeAlso: AH=01h,AH=02h
--------V-4916-------------------------------
INT 49 - TI Professional PC - CRT - SET ATTRIBUTE LATCH
    AH = 16h
    BL = new attribute (see #03210)
Return: nothing
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h
--------V-4917-------------------------------
INT 49 - TI Professional PC - CRT - GET START-OF-DISPLAY POINTER
    AH = 17h
Return: DX = current offset at which display starts
Note:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,INT 10/AH=FEh
--------V-4918-------------------------------
INT 49 - TI Professional PC - CRT - PRINT TTY STRING
    AH = 18h
    CS:BX -> counted string (count byte with length followed by string)
Return: nothing
Notes:    AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
    the string must be located in the caller's code segment; any TSRs
      which want to hook INT 49 must check for this function and emulate
      it, because the BIOS retrieves the caller's CS from the stack
SeeAlso: AH=01h,AH=02h,AH=0Eh
--------B-4A---------------------------------
INT 4A C - SYSTEM - USER ALARM HANDLER
Desc:    This interrupt is invoked by the BIOS when a real-time clock alarm
      occurs; an application may use it to perform an action at a
      predetermined time.
Note:    this interrupt is called from within a hardware interrupt handler,
      so all usual precautions against reentering DOS must be taken
SeeAlso: INT 1A/AH=06h
--------h-4A---------------------------------
INT 4A - Z100 - Slave 8259 - S100 vectored line 2
SeeAlso: INT 49"Z100",INT 4B"Z100"
--------b-4A---------------------------------
INT 4A - Tandy 2000 - PRINT SCREEN
Note:    this interrupt is identical to INT 05
SeeAlso: INT 05"PRINT SCREEN"
--------O-4A---------------------------------
INT 4A - Acorn BBC Master 512 - "OSWORD" - MISC FUNCTIONS USING CONTROL BLOCK
    AL = function code
        FAh transfer data between 80186 and 65C12 I/O processor
    DS:BX -> control block (see #03211)
Return: FLAGS destroyed
    control block updated
Note:    there are more functions than are listed here, but details are not
      available
SeeAlso: INT 40"Acorn",INT 4B"Acorn",INT 4C"Acorn"

Format of BBC Master control block for function FAh:
Offset    Size    Description    (Table 03211)
 00h    BYTE    number of parameters sent to I/O processor (0Dh,0Eh)
 01h    BYTE    number of parameters read from I/O processor (01h)
 02h    DWORD    I/O processor address
 06h    DWORD    80186 segment:offset address
 0Ah    WORD    number of bytes to transfer
 0Ch    BYTE    operation type
        00h write to 65C12 at 24 us/byte
        01h read from 65C12 at 24 us/byte
        02h write to 65C12 at 26 us/word
        03h read from 65C12 at 26 us/word
        04h write to 65C12 at 10 us/byte using 256-byte blocks
        05h read from 65C12 at 10 us/byte using 256-byte blocks
 0Dh    BYTE    65C12 memory access control (only used if offset 00h = 0Eh)
        (see #03212)

Bitfields for 65C12 memory access control:
Bit(s)    Description    (Table 03212)
 7    unused
 6    always use main screen memory if I/O addr 3000h-7FFFh (overrides bit 5)
 5    use shadow screen memory if screen address specified
 4    use current ROM rather than ROM selected by bits 3-0 (only if I/O
      address between 8000h and BFFFh)
 3-0    paged ROM number
--------b-4A00-------------------------------
INT 4A - TI Professional PC - KEYBOARD - GET KEYPRESS
    AH = 00h
Return: AX = keystroke (AH=00h for ASCII keys -- no scan code)
SeeAlso: AH=01h,AH=02h,AH=03h,AH=04h,AH=05h,INT 16/AH=00h
SeeAlso: INT 47"TI Professional",INT 48/AH=00h"TI Professional"
SeeAlso: INT 49/AH=01h"TI",INT 4C"TI Professional",INT 4D/AH=00h
SeeAlso: INT 5B"TI Professional"
--------b-4A01-------------------------------
INT 4A - TI Professional PC - KEYBOARD - GET KEYBOARD STATUS
    AH = 01h
Return: ZF set if no keystroke available
    ZF clear if keystrokes in buffer
        AX = next keystroke (AH=00h for ASCII keys -- no scan code)
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 16/AH=01h
--------b-4A02-------------------------------
INT 4A - TI Professional PC - KEYBOARD - GET KEYBOARD MODE
    AH = 02h
Return: AL = shift states (see #03213)
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 16/AH=02h

Bitfields for TI Professional PC keyboard shift states:
Bit(s)    Description    (Table 03213)
 0    Ctrl key pressed
 1    Alt key pressed
 2    either Shift key pressed
 3-6    0
 7    CapsLock is ON
--------b-4A03-------------------------------
INT 4A - TI Professional PC - KEYBOARD - FLUSH KEYBOARD BUFFER
    AH = 03h
Return: nothing
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h
--------b-4A04-------------------------------
INT 4A - TI Professional PC - KEYBOARD - SEND COMMAND TO KEYBOARD
    AH = 04h
    AL = command
        00h reset to default states
        01h enable auto-repeat (default)
        02h disable auto-repeat
        03h lock keyboard
        04h unlock keyboard (default)
        05h enable keyclick (requires hardware modification to work)
        06h disable keyclick (default)
Return: nothing
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h
--------b-4A05-------------------------------
INT 4A - TI Professional PC - KEYBOARD - INSERT CHARACTER INTO KEYBOARD BUFFER
    AH = 05h
    BX = character code (BH=00h if ASCII character, BL=00h/BH nonzero for
          extended codes) (see #03214)
Return: ZF set if keyboard buffer was already full
    ZF clear if keystroke inserted into buffer
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 5B"TI"

(Table 03214)
Values for TI Professional PC scan/character codes:
 Scan    Key    Normal    Shift    Ctrl    Alt    Notes
 00h      -- unused
 01h    F5    3F00h    5800h    6200h    6C00h
 02h    F6    4000h    5900h    6300h    6D00h
 03h    F7    4100h    5A00h    6400h    6E00h
 04h    F8    4200h    5B00h    6500h    6F00h
 05h    F9    4300h    5C00h    6600h    7000h
 06h    F10    4400h    5D00h    6700h    7100h
 07h    F11    4500h    0800h    0A00h    0C00h
 08h    F12    4600h    0900h    0B00h    0D00h
 09h    1 !    0031h    0021h    ----    7800h
 0Ah    2 @    0032h    0040h    0300h    7900h
 0Bh    3 #    0033h    0023h    ----    7A00h
 0Ch    4 $    0034h    0024h    ----    7B00h
 0Dh    5 %    0035h    0025h    ----    7C00h
 0Eh    6 ^    0036h    005Eh    001Eh    7D00h
 0Fh    7 &    0037h    0026h    ----    7E00h
 10h    8 *    0038h    002Ah    ----    7F00h
 11h    9 (    0039h    0028h    ----    8000h
 12h    0 )    0030h    0029h    ----    8100h
 13h    - _    002Dh    005Fh    001Fh    8200h
 14h    = +    003Dh    002Bh    ----    8300h
 15h BACK SPACE 0008h    0008h    007Fh    ----
 16h    ` ~    0060h    007Eh    ----    ----
 17h    NUM =    003Dh    003Dh    003Dh    8C00h
 18h    NUM +    002Bh    002Bh    002Bh    8D00h
 19h   NUM SPAC    0020h    0020h    0020h    8E00h
 1Ah   NUM TAB    0009h    0F00h    0009h    8F00h
 1Bh    NUM 1    0031h    0031h    0031h    (alt-###)    [Note 5]
 1Ch    (unused)
 1Dh    NUM 0    0030h    0030h    0030h    (alt-###)    [Note 5]
 1Eh  NUM ENTER    000Dh    000Dh    000Dh    ----
 1Fh    NUM 4    0034h    0034h    0034h    (alt-###)    [Note 5]
 20h    NUM 5    0035h    0035h    0035h    (alt-###)    [Note 5]
 21h    NUM 9    0039h    0039h    0039h    (alt-###)    [Note 5]
 22h    NUM -    002Dh    002Dh    002Dh    ----
 23h    NUM 2    0032h    0032h    0032h    (alt-###)    [Note 5]
 24h-26h  -- unused
 27h    NUM 7    0037h    0037h    0037h    (alt-###)    [Note 5]
 28h    NUM 8    0038h    0038h    0038h    (alt-###)    [Note 5]
 29h    NUM 6    0036h    0036h    0036h    (alt-###)    [Note 5]
 2Ah    NUM ,    002Ch    002Ch    002Ch    ----
 2Bh    NUM 3    0033h    0033h    0033h    (alt-###)    [Note 5]
 2Ch    NUM .    002Eh    002Eh    002Eh    ----
 2Dh    PRINT    7200h    [Note2]    ----    ----    [Notes 1,2]
 2Eh   RtArrow    4D00h    8A00h    7400h    4E00h
 2Fh    INS    5200h    2800h    2900h    2A00h    [Note 1]
 30h    DEL    5300h    3800h    3900h    3A00h    [Note 1]
 31h    TAB    0009h    0F00h    0009h    ----
 32h    Q    0071h    0051h    0011h    1000h
 33h    W    0077h    0057h    0017h    1100h
 34h    E    0065h    0045h    0005h    1200h
 35h    R    0072h    0052h    0012h    1300h
 36h    T    0074h    0054h    0014h    1400h
 37h    Y    0079h    0059h    0019h    1500h
 38h    U    0075h    0055h    0015h    1600h
 39h    I    0069h    0049h    0009h    1700h
 3Ah    O    006Fh    004Fh    000Fh    1800h
 3Bh    P    0070h    0050h    0010h    1900h
 3Ch    [ {    005Bh    007Bh    001Bh    ----
 3Dh    ] }    005Dh    007Dh    001Dh    ----
 3Eh  LINE FEED    000Ah    000Ah    7500h    4F00h
 3Fh  BRK/PAUS    [Note3]    [Note4]    ----    ----    [Notes 1,3,4]
 40h  UpArrow    4800h    8800h    8400h    4900h
 41h    ESC    001Bh    001Bh    001Bh    ----
 42h    A    0061h    0041h    0001h    1E00h
 43h    S    0073h    0053h    0013h    1F00h
 44h    D    0064h    0044h    0004h    2000h
 45h    F    0066h    0046h    0006h    2100h
 46h    G    0067h    0047h    0007h    2200h
 47h    H    0068h    0048h    0008h    2300h
 48h    J    006Ah    004Ah    000Ah    2400h
 49h    K    006Bh    004Bh    000Bh    2500h
 4Ah    L    006Ch    004Ch    000Ch    2600h
 4Bh    ; :    003Bh    003Ah    ----    ----
 4Ch    ' "    0027h    0022h    ----    ----
 4Dh    RETURN    000Dh    000Dh    000Dh    ----
 4Eh    \ |    005Ch    007Ch    001Ch    ----
 4Fh  LeftArrow    4B00h    8B00h    7300h    4C00h
 50h    HOME    4700h    8600h    7700h    8500h
 51h  Space Bar    0020h    0020h    0020h    0020h
 52h    Z    007Ah    005Ah    001Ah    2C00h
 53h    X    0078h    0058h    0018h    2D00h
 54h    C    0063h    0043h    0003h    2E00h
 55h    V    0076h    0056h    0016h    2F00h
 56h    B    0062h    0042h    0002h    3000h
 57h    N    006Eh    004Eh    000Eh    3100h
 58h    M    006Dh    004Dh    000Dh    3200h
 59h    , <    002Ch    003Ch    ----    ----
 5Ah  PRINT    7200h    [Note2]    ----    ----    [Notes 1,2]
 5Bh    . >    002Eh    003Eh    ----    ----
 5Ch    / ?    002Fh    003Fh    ----    ----
 5Dh    (unused)
 5Eh    DEL    5300h    3800h    3900h    3A00h    [Note 1]
 5Fh    INS    5200h    2800h    2900h    2A00h    [Note 1]
 60h  DownArrow    5000h    8900h    7600h    5100h
 61h-63h  -- unused
 64h  BRK/PAUS    [Note3]    [Note4]    ----    ----    [Notes 1,3,4]
 65h    F1    3B00h    5400h    5E00h    6800h
 66h    F2    3C00h    5500h    5F00h    6900h
 67h    F3    3D00h    5600h    6000h    6A00h
 68h    F4    3E00h    5700h    6100h    6B00h
 69h-6Fh  -- unused
Notes:    [1] four of the keys can have differing scan codes, depending on the
      actual keyboard; the BIOS accepts either scan code ("normal": 2Fh,
      30h, 5Ah, 64h; "alternate": 2Dh,3Fh,5Eh,5Fh) for any of these keys
    [2] Shift-Print invokes INT 5E for a screen dump; the PRTSCRN.DEV
      device driver also supports Alt-Print, Ctrl-Print, Shift-Alt-Print,
      and Shift-Ctrl-Print for dumping graphics in various permutations
    [3] BRK/PAUS invokes INT 5C for a pause, then stuffs 0100h into the
      keyboard buffer
    [4] Shift-BRK/PAUS invokes INT 5D for the Break, then stuffs 0000h
      into the keyboard buffer; MS-DOS hooks INT 5D to keep the 0000h from
      appearing in the keyboard buffer
    [5] on the TI Pro, one enters an arbitrary character slightly
      differently than on a standard PC: exactly three numberpad digits
      must be pressed (using leading zeros for codes less than 100), and
      the key for the requested code is inserted into the keyboard buffer
      immediately on pressing the third key.  The Alt key may be released
      and re-pressed arbitrarily often between digits without affecting
      the Alt-digit-digit-digit sequence.
    scan codes with bit 7 set are not key releases, but rather
      auto-repeated keystrokes, which the BIOS only places into the
      keyboard buffer if the buffer is empty at the time (thus avoiding
      typeahead of repeated keystrokes faster than they can be processed)
SeeAlso: #00006 at INT 09
--------h-4B---------------------------------
INT 4B - Z100 - Slave 8259 - S100 vectored line 3
SeeAlso: INT 4A"Z100",INT 4C"Z100"
--------d-4B---------------------------------
INT 4B - Common Access Method SCSI interface (draft revision 1.9)
    ES:DI -> CAM Control Block (see #03229 at INT 4F/AX=8100h)
InstallCheck:    test for the string "SCSI_CAM" eight bytes past the INT 4Bh
      handler
Notes:    the CAM committee moved the interface to INT 4F after revision 1.9
      to avoid conflicting with the IBM SCSI interface and the Virtual
      DMA specification
    the only driver to date reported to use the CAM interface on INT 4B
      instead of INT 4F is from Future Domain (which has drivers for CAM
      on either interrupt)
SeeAlso: INT 4F/AX=8100h
Index:    installation check;Common Access Method SCSI interface
--------b-4B---------------------------------
INT 4B - Tandy 2000 - EQUIPMENT DETERMINATION
Return: AX = BIOS equipment list word (see #03215)
Note:    this interrupt is identical to INT 11 on the Tandy 2000
SeeAlso: INT 11"EQUIPMENT",INT 4A"Tandy 2000",INT 4C"Tandy 2000"

Bitfields for Tandy 2000 BIOS equipment list:
Bit(s)    Description    (Table 03215)
 0    reserved
 1    monochrome graphics installed
 2    graphics with color option installed
 3    floppy disk drive 1 installed
 4    floppy disk drive 2 installed
 5    hard disk drive 1 installed
 6    hard disk drive 2 installed
 7    unused
 8    black and white monitor
 9    color monitor
 12-10    reserved
 13    printer installed
 14    reserved
 15    unused
SeeAlso: #00226 at INT 11
--------O-4B---------------------------------
INT 4B - Acorn BBC Master 512 - "OSBYTE" - MISC FUNCTIONS USING REGISTER PARAMS
    AL = function code
    BL = first parameter
    BH = second parameter (if needed)
Return: BL = first return parameter
    BH = second return parameter
    CF depends on function
SeeAlso: INT 40"Acorn",INT 4A"Acorn",INT 4C"Acorn"
--------b-4B00-------------------------------
INT 4B - TI Professional PC - PARALLEL PORT - OUTPUT CHARACTER
    AH = 00h
    DL = printer number (00h)
    AL = character to print
Return: AH = printer status (see #03216)
Note:    on the TI Pro, the BIOS only supports DL=00h; MS-DOS versions for the
      TI hook INT 4B and handle requests for DL<>00h
SeeAlso: AH=01h,AH=02h,INT 17/AH=00h
SeeAlso: INT 40"TI Professional",INT 48/AH=00h"TI Professional"
SeeAlso: INT 49/AH=01h"TI",INT 4C"TI Professional",INT 4D/AH=00h

Bitfields for TI Professional PC printer status:
Bit(s)    Description    (Table 03216)
 0    timeout (function 00h only)
 3-1    unused
 4    busy
 5    paper out
 6    on-line (selected)
 7    fault
--------b-4B01-------------------------------
INT 4B - TI Professional PC - PARALLEL PORT - INITIALIZE PRINTER
    AH = 01h
    DL = printer number (00h)
Return: AH = printer status (see #03216)
Note:    on the TI Pro, the BIOS only supports DL=00h; MS-DOS versions for the
      TI hook INT 4B and handle requests for DL<>00h
SeeAlso: AH=00h,AH=02h,INT 17/AH=01h
--------b-4B02-------------------------------
INT 4B - TI Professional PC - PARALLEL PORT - GET PRINTER STATUS
    AH = 02h
    DL = printer number (00h)
Return: AH = printer status (see #03216)
Note:    on the TI Pro, the BIOS only supports DL=00h; MS-DOS versions for the
      TI hook INT 4B and handle requests for DL<>00h
SeeAlso: AH=00h,AH=01h,INT 17/AH=02h
--------d-4B80-------------------------------
INT 4B - IBM SCSI interface
    AH = 80h
    AL = 00h-10h (Corel PowerSCSI INT4BCAM.SYS)
    further details not yet available
--------d-4B8102DX0000-----------------------
INT 4B - Virtual DMA Specification (VDS) - GET VERSION
    AX = 8102h
    DX = 0000h
Return: CF clear if successful
        AH = major version number
        AL = minor version number
        BX = product number (see #03217)
        CX = product revision number
        always 0000h for QMAPS and HPMM.SYS
        always 0001h for Microsoft's EMM386.EXE v4.20-4.41
        DX = flags (see #03219)
        SI:DI = maximum DMA buffer size
    CF set on error
        AL = error code (see #03218)
Note:    bit 5 of 0040h:007Bh is supposed to be set if VDS is supported; this is
      apparently not always the case
SeeAlso: INT 2C/AX=002Bh,INT 31/AX=0400h,MEM 0040h:007Bh"4Bh"
Index:    installation check;Virtual DMA Specification

(Table 03217)
Values for VDS product number:
 0000h    for Quadtel's QMAPS and Hewlett-Packard's HPMM.SYS
 0001h    for Microsoft's EMM386.EXE
 0003h    for Windows 3.x WIN386.EXE
 0300h    OS/2 (all versions to date)
 0EDCh    for DR DOS 6.0 EMM386.SYS
 4560h    ("E`") for Qualitas' 386MAX
 4D43h    ("MC") for V Communications' Memory Commander
 5145h    ("QE") for Quarterdeck's QEMM-386
 524Dh    ("RM") for Helix's Netroom RM386

(Table 03218)
Values for VDS error code:
 01h    region not in contiguous memory
 02h    region crossed a physical alignment boundary
 03h    unable to lock pages
 04h    no buffer available
 05h    region too large for buffer
 06h    buffer currently in use
 07h    invalid memory region
 08h    region was not locked
 09h    number of physical pages greater than table length
 0Ah    invalid buffer ID
 0Bh    copy out of buffer range
 0Ch    invalid DMA channel number
 0Dh    disable count overflow
 0Eh    disable count underflow
 0Fh    function not supported
 10h    reserved flag bits set in DX

Bitfields for VDS flags:
Bit(s)    Description    (Table 03219)
 0    PC/XT bus (DMA in first megabyte only)
 1    physical buffer/remap region in first megabyte
 2    automatic remap enabled
 3    all memory is physically contiguous
 4-15    reserved (zero)
--------d-4B8103-----------------------------
INT 4B - Virtual DMA Specification - LOCK DMA REGION
    AX = 8103h
    DX = flags (see #03220)
    ES:DI -> DMA descriptor structure (see #03221,#03222,#03223)
Return: CF clear if successful
        DDS physical address field filled in
        DDS buffer ID field filled (0000h if no buffer allocated)
    CF set on error
        AL = error code (see #03218)
        DDS region size field filled wth maximum contiguous length in bytes
BUGS:    Windows 3.0 does not correctly support automatic remapping or copying
      in enhanced mode
    Windows 3.0 in enhanced mode does not return a correct code on error
SeeAlso: AX=8104h,AX=8105h

Bitfields for VDS flags:
Bit(s)    Description    (Table 03220)
 0    reserved (zero)
 1    data should be copied into buffer (ignored if 2 set)
 2    buffer should not be allocated if region noncontiguous or crosses
      physical alignment boundary specified by 4-5
 3    don't attempt automatic remap
 4    region must not cross 64K physical alignment boundary
 5    region must not cross 128K physical alignment boundary
 6-15    reserved (zero)

Format of DMA descriptor structure (DDS):
Offset    Size    Description    (Table 03221)
 00h    DWORD    region size
 04h    DWORD    offset
 08h    WORD    segment/selector
 0Ah    WORD    buffer ID
 0Ch    DWORD    physical address

Format of Extended DMA descriptor structure (EDDS):
Offset    Size    Description    (Table 03222)
 00h    DWORD    region size
 04h    DWORD    offset
 08h    WORD    segment/selector
 0Ah    WORD    reserved
 0Ch    WORD    number available
 0Eh    WORD    number used
 10h    DWORD    region 0 physical address
 14h    DWORD    region 0 size in bytes
 18h    DWORD    region 1 physical address
 1Ch    DWORD    region 1 size in bytes
    ...

Format of Extended DMA descriptor structure (EDDS) with page table entries:
Offset    Size    Description    (Table 03223)
 00h    DWORD    region size
 04h    DWORD    offset
 08h    WORD    segment/selector
 0Ah    WORD    reserved
 0Ch    WORD    number available
 0Eh    WORD    number used
 10h    DWORD    page table entry 0 (same as 80386 page table entry)
 14h    DWORD    page table entry 1
    ...
Note:    bits 1-11 of the page table entries should be zero; bit 0 set if page
      is present and locked
--------d-4B8104-----------------------------
INT 4B - Virtual DMA Specification - UNLOCK DMA REGION
    AX = 8104h
    DX = flags
        bit 0: reserved (zero)
        bit 1: data should be copied out of buffer
        bits 2-15 reserved (zero)
    ES:DI -> DMA descriptor structure (see #03221,#03222) with region size,
          physical address, and buffer ID fields set
Return: CF clear if successful
        DDS physical address field set
        DDS buffer ID field set (0000h if no buffer allocated)
    CF set on error
        AL = error code (see #03218)
        DDS region size field filled wth maximum contiguous length in bytes
Note:    Windows 3.0 does not check whether the region extends beyond the end of
      a segment
BUG:    Windows 3.0 in enhanced mode does not return a correct code on error
SeeAlso: AX=8103h,AX=8106h
--------d-4B8105-----------------------------
INT 4B - Virtual DMA Specification - SCATTER/GATHER LOCK REGION
    AX = 8105h
    DX = flags (see #03224)
    ES:DI -> Extended DMA descriptor structure (see #03222,#03223)
          region size, linear segment, linear offset, and number avail
          fields set
Return: CF clear if successful
        EDDS number used field set
        if DX bit 6 set, lower 12 bits of BX = offset in first page
    CF set on error
        AL = error code (see #03218)
        EDDS region size field filled with max length in bytes that can be
          locked and described in the EDDS table
BUG:    Windows 3.0 in enhanced mode may return zero instead of the physical
      page address for pages which were originally not present
SeeAlso: AX=8103h,AX=8106h

Bitfields for VDS flags:
Bit(s)    Description    (Table 03224)
 0-5    reserved (zero)
 6    EDDS should be returned with page table entries
 7    only present pages should be locked (not-present pages receive entry
      of 0000h)
 8-15    reserved (zero)
--------d-4B8106-----------------------------
INT 4B - Virtual DMA Specification - SCATTER/GATHER UNLOCK REGION
    AX = 8106h
    DX = flags (see #03225)
    ES:DI -> Extended DMA descriptor structure (see #03222,#03223) returned
          by AX=8105h
Return: CF clear if successful
    CF set on error
        AL = error code (see #03218)
Note:    according to the Microsoft version of the VDS specification, the
      actual scatter/gather list is ignored, while according to the IBM
      version of the specification, "the result of a LOCK operation"
      must be provided to this function
SeeAlso: AX=8104h,AX=8105h

Bitfields for VDS flags:
Bit(s)    Description    (Table 03225)
 0-5    reserved (zero)
 6    EDDS contains page table entries
 7    EDDS may contain not-present pages (entry = 0000h)
 8-15    reserved (zero)
--------d-4B8107-----------------------------
INT 4B - Virtual DMA Specification - REQUEST DMA BUFFER
    AX = 8107h
    DX = flags
        bit 0: reserved (zero)
        bit 1: data should be copied into buffer
        bits  2-15 reserved (zero)
    ES:DI -> DMA descriptor structure (see #03221) with region size set
          (also region offset and region segment if DX bit 1 set)
Return: CF clear if successful
        DDS physical address and buffer ID set
        DDS region size filled with length of buffer
    CF set on error
        AL = error code (see #03218)
SeeAlso: AX=8108h
--------d-4B8108-----------------------------
INT 4B - Virtual DMA Specification - RELEASE DMA BUFFFER
    AX = 8108h
    DX = flags
        bit 0: reserved (zero)
        bit 1: data should be copied out of buffer
        bits 2-15 reserved (zero)
    ES:DI -> DMA descriptor structure (see #03221,#03222) with buffer ID set
          (also region size/region offset/segment if DX bit 1 set)
Return: CF clear if successful
    CF set on error
        AL = error code (see #03218)
BUG:    under Windows 3.0 Enhanced mode, you must specify that data be copied
      for this function to work correctly
SeeAlso: AX=8107h
--------d-4B8109DX0000-----------------------
INT 4B - Virtual DMA Specification - COPY INTO DMA BUFFER
    AX = 8109h
    DX = 0000h
    ES:DI -> DMA descriptor structure (see #03221,#03222) with buffer ID,
          region segment/offset, and region size fields set
    BX:CX = starting offset into DMA buffer
Return: CF clear if successful
    CF set on error
        AL = error code (see #03218)
BUG:    Windows 3.0 Enhanced mode does not correctly interpret the copy count
SeeAlso: AX=810Ah
--------d-4B810ADX0000-----------------------
INT 4B - Virtual DMA Specification - COPY OUT OF DMA BUFFER
    AX = 810Ah
    DX = 0000h
    ES:DI -> DMA descriptor structure (see #03221,#03223) with buffer ID,
          region segment/offset, and region size fields set
    BX:CX = starting offset into DMA buffer
Return: CF clear if successful
    CF set on error
        AL = error code (see #03218)
BUG:    Windows 3.0 Enhanced mode does not correctly interpret the copy count
SeeAlso: AX=8109h
--------d-4B810B-----------------------------
INT 4B - Virtual DMA Specification - DISABLE DMA TRANSLATION
    AX = 810Bh
    BX = DMA channel number
    DX = 0000h
Return: CF clear if successful
    CF set on error
        AL = error code (see #03218)
SeeAlso: AX=810Ch
--------d-4B810C-----------------------------
INT 4B - Virtual DMA Specification - ENABLE DMA TRANSLATION
    AX = 810Ch
    BX = DMA channel number
    DX = 0000h
Return: CF clear if successful
        ZF set if disable count decremented to zero
    CF set on error
        AL = error code (see #03218)
SeeAlso: AX=810Bh
--------Q-4B810D-----------------------------
INT 4B - QEMM-386 - BUG
    AX = 810Dh
Note:    the code in QEMM v5.11 and 6.00 jumps to an invalid location on this
      call
--------h-4C---------------------------------
INT 4C - Z100 - Slave 8259 - S100 vectored line 4
SeeAlso: INT 4B"Z100",INT 4D"Z100"
--------b-4C---------------------------------
INT 4C - TI Professional PC - CLOCK/ANALOG INTERFACE
    no details available
SeeAlso: INT 40"TI Professional",INT 49/AH=01h"TI"
SeeAlso: INT 4A/AH=00h"TI",INT 4B"TI Professional",INT 4D/AH=00h
SeeAlso: INT 58"TI Professional"
--------b-4C---------------------------------
INT 4C - Tandy 2000 - GET MEMORY SIZE
Return: AX = kilobytes of contiguous memory starting at 0
Note:    this interrupt is identical to INT 12 on the Tandy 2000
SeeAlso: INT 12"BIOS",INT 4A"Tandy 2000",INT 4B"Tandy 2000",INT 51"Tandy 2000"
--------O-4C---------------------------------
INT 4C - Acorn BBC Master 512 - "OSCLI" - INTERPRET COMMAND LINE
    DS:BX -> CR-terminated command string
Return: FLAGS destroyed
SeeAlso: INT 40"Acorn",INT 4A"Acorn",INT 4B"Acorn"
--------h-4D---------------------------------
INT 4D - Z100 - Slave 8259 - S100 vectored line 5
SeeAlso: INT 4C"Z100",INT 4E"Z100"
--------s-4D---------------------------------
INT 4D - IBM - M-Audio Adapter SUPPORT
    no details available; supposedly documented in IBM form G571-0203-01
--------B-4D00-------------------------------
INT 4D - TI Professional PC - DISK - RESET DISK SYSTEM
    AH = 00h
    DL = drive (if bit 7 is set both hard disks and floppy disks reset)
Return: AH = status (see #00234 at INT 13/AH=01h)
    CF clear if successful (returned AH=00h)
    CF set on error
Note:    this function is the same as INT 13/AH=00h on a standard PC BIOS
SeeAlso: AH=01h,AH=02h,AH=08h,AH=0Bh,INT 13/AH=00h,INT 46"TI Professional"
SeeAlso: INT 48/AH=00h"TI Professional",INT 4A/AH=00h"TI"
--------B-4D01-------------------------------
INT 4D - TI Professional PC - DISK - GET STATUS OF LAST OPERATION
    AH = 01h
    DL = drive (bit 7 set for hard disk)
Return: CF clear if status unchanged
    CF set if status changed since last call
    AH = 00h
    AL = status of previous operation (see #00234 at INT 13/AH=01h)
Notes:    this function is nearly the same as INT 13/AH=01h on a standard PC BIOS
    the TI's BIOS tranparently performs a number of retries, and an error
      status is only reported if all of the retries fail.  To get the error
      status if the operation succeeded on a retry, use AH=07h instead
SeeAlso: AH=00h,AH=07h,INT 13/AH=01h
--------B-4D02-------------------------------
INT 4D - TI Professional PC - DISK - READ SECTOR(S) INTO MEMORY
    AH = 02h
    AL = number of sectors to read (must be nonzero)
    CH = low eight bits of cylinder number
    CL = sector number 1-63 (bits 0-5)
         high two bits of cylinder (bits 6-7, hard disk only)
    DH = head number
    DL = drive number (bit 7 set for hard disk)
    ES:BX -> data buffer
Return: CF set on error
        if AH = 11h (corrected ECC error), AL = burst length
    CF clear if successful
    AH = status (see #00234 at INT 13/AH=01h)
    AL = number of sectors transferred
    ES:BX -> buffer for last sector processed (including one with errors)
SeeAlso: AH=00h,AH=01h,AH=03h,AH=04h,INT 13/AH=02h
--------B-4D03-------------------------------
INT 4D - TI Professional PC - DISK - WRITE SECTOR(S) FROM MEMORY
    AH = 03h
    AL = number of sectors to write (must be nonzero)
    CH = low eight bits of cylinder number
    CL = sector number 1-63 (bits 0-5)
         high two bits of cylinder (bits 6-7, hard disk only)
    DH = head number
    DL = drive number (bit 7 set for hard disk)
    ES:BX -> buffer containing data
Return: CF set on error
        if AH = 11h (corrected ECC error), AL = burst length
    CF clear if successful
    AH = status (see #00234 at INT 13/AH=01h)
    AL = number of sectors transferred
    ES:BX -> buffer for last sector processed (including one with errors)
SeeAlso: AH=00h,AH=01h,AH=02h,AH=04h,INT 13/AH=03h
--------B-4D04-------------------------------
INT 4D - TI Professional PC - DISK - VERIFY DISK SECTOR CRC(S)
    AH = 04h
    AL = number of sectors to verify (must be nonzero)
    CH = low eight bits of cylinder number
    CL = sector number 1-63 (bits 0-5)
         high two bits of cylinder (bits 6-7, hard disk only)
    DH = head number
    DL = drive number (bit 7 set for hard disk)
    ES:BX -> data buffer
Return: CF set on error
        if AH = 11h (corrected ECC error), AL = burst length
    CF clear if successful
    AH = status (see #00234 at INT 13/AH=01h)
    AL = number of sectors transferred
    ES:BX -> buffer for last sector processed (including one with errors)
Note:    even though no data is transferred, ES:BX must still be valid
SeeAlso: AH=00h,AH=01h,AH=02h,AH=06h,INT 13/AH=04h
--------B-4D05-------------------------------
INT 4D - TI Professional PC - DISK - NOP
    AH = 05h
Note:    on the TI Pro, FORMAT.COM contains direct port I/O commands to perform
      disk formatting, rather than using the BIOS
--------B-4D06-------------------------------
INT 4D - TI Professional PC - DISK - VERIFY DISK SECTOR(S)
    AH = 06h
    AL = number of sectors to verify (must be nonzero)
    CH = low eight bits of cylinder number
    CL = sector number 1-63 (bits 0-5)
         high two bits of cylinder (bits 6-7, hard disk only)
    DH = head number
    DL = drive number (bit 7 set for hard disk)
    ES:BX -> data buffer
Return: CF set on error
        if AH = 11h (corrected ECC error), AL = burst length
    CF clear if successful
    AH = status (see #00234 at INT 13/AH=01h)
    AL = number of sectors transferred
    ES:BX -> buffer for last sector processed (including one with errors)
Note:    even though no data is transferred, ES:BX must still be valid because
      an actual comparison with disk data is performed, not just the CRC
      check of the standard PC BIOS or INT 4D/AH=04h
SeeAlso: AH=00h,AH=01h,AH=02h,AH=04h,INT 13/AH=04h
--------B-4D07-------------------------------
INT 4D - TI Professional PC - DISK - GET RETRY STATUS OF LAST OPERATION
    AH = 07h
    DL = drive (bit 7 set for hard disk)
Return: CF clear if status unchanged
    CF set if status changed since last call
    AH = 00h
    AL = status of previous operation (see #00234 at INT 13/AH=01h)
Notes:    this function is nearly the same as INT 13/AH=01h on a standard PC BIOS
    the TI's BIOS tranparently performs a number of retries; this function
      returns the error status of a failed operation even if the operation
      succeeded on a retry
SeeAlso: AH=00h,AH=01h,INT 13/AH=01h
--------B-4D08-------------------------------
INT 4D - TI Professional PC - DISK - SET STANDARD DEVICE INTERFACE TABLE
    AH = 08h
    DL = drive number (00h-03h)
    AL = drive type
        00h single-sided 48 tpi (40-track, 8 sectors, 512 bytes/sector)
        01h double-sided 48 tpi (40-track, 8 sectors, 512 bytes/sector)
        02h single-sided 96 tpi (80-track, 8 sectors, 512 bytes/sector)
        03h double-sided 96 tpi (80-track, 8 sectors, 512 bytes/sector)
Return: nothing???
SeeAlso: AH=00h,AH=09h
--------B-4D09-------------------------------
INT 4D - TI Professional PC - DISK - SET DEVICE INTERFACE TABLE ADDRESS
    AH = 09h
    DL = drive number (00h-07h)
    ES:BX -> Device Interface Table (see #03226)
Return: nothing???
SeeAlso: AH=00h,AH=08h,AH=0Ah,INT 1E

Format of TI Professional PC Device Interface Table:
Offset    Size    Description    (Table 03226)
 00h    DWORD    -> entry point for disk routine
 04h    WORD    bytes per sector
 06h    BYTE    sectors per track
 07h    BYTE    number of heads
 08h    BYTE    number of cylinders
 09h    BYTE    retry count
 0Ah    BYTE    precompensation start
SeeAlso: #01264 at INT 1E
--------B-4D0A-------------------------------
INT 4D - TI Professional PC - DISK - GET DEVICE INTERFACE TABLE ADDRESS
    AH = 0Ah
    DL = drive number (00h-07h)
Return: AH = status
    ES:BX -> Device Interface Table (see #03226)
SeeAlso: AH=00h,AH=08h,AH=09h,INT 1E
--------B-4D0B-------------------------------
INT 4D - TI Professional PC - DISK - TURN OFF ALL DRIVES
    AH = 0Bh
Return: AH = 00h
Note:    used for diagnostics or to conserve power
SeeAlso: AH=00h
--------h-4E---------------------------------
INT 4E - Z100 - Slave 8259 - S100 vectored line 6
SeeAlso: INT 4D"Z100",INT 4F"Z100"
--------b-4E00-------------------------------
INT 4E - TI Professional PC - TIME-OF-DAY CLOCK - SET BIOS DATE
    AH = 00h
    BX = number of days since January 1, 1980
Return: nothing
SeeAlso: AH=01h,AH=02h
SeeAlso: INT 40"TI Professional",INT 48/AH=00h"TI Professional"
SeeAlso: INT 4A/AH=00h"TI",INT 4F"TI Professional"
--------b-4E01-------------------------------
INT 4E - TI Professional PC - TIME-OF-DAY CLOCK - SET BIOS TIME
    AH = 01h
    CH = hours
    CL = minutes
    DH = seconds
    DL = hundredths
Return: nothing
Note:    the BIOS does not validate the data passed to this function
SeeAlso: AH=00h,AH=02h
--------b-4E02-------------------------------
INT 4E - TI Professional PC - TIME-OF-DAY CLOCK - GET BIOS DATA AND TIME
    AH = 02h
Return: AX = number of days since January 1, 1980
    CH = hours
    CL = minutes
    DH = seconds
    DL = hundredths
SeeAlso: AH=00h,AH=01h
--------h-4F---------------------------------
INT 4F - Z100 - Slave 8259 - S100 vectored line 7
SeeAlso: INT 4E"Z100"
--------b-4F---------------------------------
INT 4F - TI Professional PC - SYSTEM CONFIGURATION CALL
Return: AX = system configuration word (see #03227)
    BX = size of contiguous DOS memory in paragraphs
SeeAlso: INT 11"BIOS",INT 12"BIOS",INT 40"TI Professional",INT 48/AH=09h
SeeAlso: INT 49/AH=01h"TI",INT 4B"TI Professional",INT 4D/AH=00h
SeeAlso: INT 4E"TI Professional"

Bitfields for TI Professional PC system configuration:
Bit(s)    Description    (Table 03227)
 0    floppy drive 0 (A:, internal) installed
 1    floppy drive 1 (B:, internal) installed
 2    floppy drive 2 (C:, external) installed
 3    floppy drive 3 (D:, external) installed
 4    drive A: is 96tpi (80 tracks)
 5    drive A: is double-sided
 6    60 Hz power instead of 50 Hz
 7    hard disk (E: or E:/F:) installed
 8    serial port 1 installed
 9    serial port 2 installed
 10    serial port 3 installed
 11    serial port 4 installed
 14-12    installed graphics RAM
    000 none (text-only system)
    001 bank A only (graphics limited to 2 of 8 colors)
    111 banks A/B/C (graphics supports 8 of 8 colors)
 15    clock/analog board installed
--------d-4F8100-----------------------------
INT 4F - Common Access Method SCSI interface rev 2.3 - SEND CCB TO XPT/SIM
    AX = 8100h
    ES:BX -> CAM Control Block (CCB) (see #03229)
Return: AH = status
        00h successful
        01h invalid CCB address (0000h:0000h)
Note:    the SCSI Interface Module (SIM) may complete the requested function
      and invoke the completion callback function before this call returns
SeeAlso: AX=8200h,INT 2F/AX=7F01h,INT 4B"Common Access Method"

(Table 03228)
Values for CAM function code:
 00h    NOP
 01h    execute SCSI I/O
 02h    get device type
 03h    path inquiry
 04h    release SIM queue
 05h    set async callback
 06h    set device type
 07h-0Fh reserved
 10h    abort SCSI command
 11h    reset SCSI bus
 12h    reset SCSI device
 13h    terminate I/O process
 14h-1Fh reserved
 20h    engine inquiry
 21h    execute engine request
 22h-2Fh reserved
 30h    enable logical unit number
 31h    execute target I/O
 32h-7Fh reserved
 80h-FFh vendor-specific functions

Format of CAM Control Block:
Offset    Size    Description    (Table 03229)
 00h    DWORD    physical address of this CCB
 04h    WORD    CAM control block length
 06h    BYTE    function code (see #03228)
 07h    BYTE    CAM status (see #03232)
 08h    BYTE    SCSI status
 09h    BYTE    path ID (FFh = XPT)
 0Ah    BYTE    target ID
 0Bh    BYTE    logical unit number
 0Ch    WORD    CAM flags (see #03230)
 0Eh    BYTE    CAM address flags (see #03231)
 0Fh    BYTE    target-mode flags (see #03233)
---function 02h---
 10h    DWORD    pointer to 36-byte buffer for inquiry data or 0000h:0000h
 14h    BYTE    peripheral device type of target logical unit number
---function 03h---
 10h    BYTE    version number (00h-07h prior to rev 1.7, 08h = rev 1.7,
        09h-FFh = rev no, i.e. 23h = rev 2.3)
 11h    BYTE    SCSI capabilities (see #03234)
 12h    BYTE    target mode support
        bit 7: processor mode
        bit 6: phase-cognizant mode
        bit 5-0: reserved
 13h    BYTE    miscellaneous flags
        bit 7: scanned high to low instead of low to high
        bit 6: removables not included in scan
        bit 5: inquiry data not kept by XPT
        bits 4-0: reserved
 14h    WORD    engine count
 16h 14 BYTEs    vendor-specific data
 24h    DWORD    size of private data area
 28h    DWORD    asynchronous event capabilities (see #03235)
 2Ch    BYTE    highest path ID assigned
 2Dh    BYTE    SCSI device ID of initiator
 2Eh  2 BYTEs    reserved
 30h 16 BYTEs    SIM vendor ID
 40h 16 BYTEs    HBA (host bus adaptor) vendor ID
 50h  4 BYTEs    operating-system dependant usage
---functions 00h,04h,11h,12h---
 no additional fields
---function 05h---
 10h    DWORD    asynchronous event enables (refer to function 03h above)
 14h    DWORD    pointer to asynchronous callback routine (see #03241)
 18h    DWORD    pointer to peripheral driver buffer
 1Ch    BYTE    size of peripheral buffer
---function 06h---
 10h    BYTE    peripheral device type of target
---functions 10h,13h---
 10h    DWORD    pointer to CCB to be aborted
---function 20h---
 10h    WORD    engine number
 12h    BYTE    engine type
        00h buffer memory
        01h lossless compression
        02h lossy compression
        03h encryption
 13h    BYTE    engine algorithm ID
        00h vendor-unique
        01h LZ1 variation 1 (STAC)
        02h LZ2 variation 1 (HP DCZL)
        03h LZ2 variation 2 (Infochip)
 14h    DWORD    engine memory size
---function 21h---
 10h    DWORD    pointer to peripheral driver
 14h  4 BYTEs    reserved
 18h    DWORD    OS-dependent request-mapping info
 1Ch    DWORD    address of completion callback routine
 20h    DWORD    pointer to scatter/gather list or data buffer
 24h    DWORD    length of data transfer
 28h    DWORD    pointer to engine buffer data
 2Ch  2 BYTEs    reserved
 2Eh    WORD    number of scatter/gather entries
 30h    DWORD    maximum destination data length
 34h    DWORD    length of destination data
 38h    DWORD    source residual length
 3Ch 12 BYTEs    reserved
 48h    DWORD    OS-dependent timeout value
 4Ch  4 BYTEs    reserved
 50h    WORD    engine number
 52h    WORD    vendor-unique flags
 54h  4 BYTEs    reserved
 58h  N BYTEs    private data area for SIM
---function 30h---
 10h    WORD    group 6 vendor-unique CDB length
 12h    WORD    group 7 vendor-unique CDB length
 14h    DWORD    pointer to target CCB list
 18h    WORD    number of target CCBs
---other functions---
 10h    DWORD    pointer to peripheral driver
 14h    DWORD    pointer to next CCB
 18h    DWORD    OS-dependent request mapping information
 1Ch    DWORD    address of completion callback routine (see #03240)
 20h    DWORD    pointer to scatter/gather list or data buffer
 24h    DWORD    length of data transfer
 28h    DWORD    pointer to sense info buffer
 2Ch    BYTE    length of sense info buffer
 2Dh    BYTE    CDB length
 2Eh    WORD    number of scatter/gather entries
        scatter/gather list is array of 2N DWORDs, each pair specifying
          the address and length of a data block
 30h  4 BYTEs    vendor-specific data
 34h    BYTE    (ret) SCSI status
 35h    BYTE    (ret) auto-sense residual length
 36h  2 BYTEs    reserved
 38h    DWORD    (ret) residual length
 40h 12 BYTEs    Command Descriptor Block (CDB) (see #03236,#03237,#03238)
 44h    DWORD    OS-dependent timeout value
 48h    DWORD    pointer to message buffer
 4Ch    WORD    length of message buffer
 4Eh    WORD    vendor-unique flags
 50h    BYTE    tag queue action
 51h  3 BYTEs    reserved
 54h  N BYTEs    private data area for SIM

Bitfields for CAM flags:
Bit(s)    Description    (Table 03230)
 0    CDB is a pointer
 1    tagged queue action enable
 2    linked CDB
 3    disable callback on completion
 4    scatter/gather
 5    disable autosense
 7-6    direction (00 reserved, 01 in, 10 out, 11 no data transfer)
 9-8    reserved
 10    engine synchronize
 11    SIM queue freeze
 12    SIM queue priority
    1 head insertion
    0 tail insertion (normal)
 13    disable synchronous transfers    \ mutually
 14    initiate synchronous transfers    / exclusive
 15    disable disconnect

Bitfields for CAM address flags:
Bit(s)    Description    (Table 03231)
 7    SG list/data (0 = host, 1 = engine)
 6    CDB pointer    (6-1: 0=virtual addr, 1=phys addr)
 5    SG list/data
 4    sense buffer
 3    message buffer
 2    next CCB
 1    callback on completion
 0    reserved

(Table 03232)
Values for CAM status:
 00h    request in progress
 01h    request successful
 02h    host aborted request
 03h    unable to abort request
 04h    request completed with error
 05h    CAM is busy
 06h    invalid request
 07h    invalid path ID
 08h    no such SCSI device
 09h    unable to terminate I/O process
 0Ah    timeout on target selection
 0Bh    timeout on command
 0Dh    receive message rejection
 0Eh    sent/received SCSI bus reset
 0Fh    detected uncorrectable parity error
 10h    Autosense request failed
 11h    no HBA detected
 12h    data over/underrun
 13h    bus freed unexpectedly
 14h    target bus phase sequence failure
 15h    CCB too small
 16h    requested capability not available
 17h    sent bus device reset
 18h    terminate I/O process
 38h    invalid LUN
 39h    invalid target ID
 3Ah    unimplemented function
 3Bh    nexus not established
 3Ch    invalid initiator ID
 3Dh    received SCSI Command Descriptor Block
 3Eh    LUN already enabled
 3Fh    SCSI bus busy
Note:    bit 6 set to indicate frozen SIM queue
    bit 7 set to indicate valid autosense

Bitfields for CAM target-mode flags:
Bit(s)    Description    (Table 03233)
 7    data buffer valid
 6    status valid
 5    message buffer valid
 4    reserved
 3    phase-cognizant mode
 2    target CCB available
 1    disable autodisconnect
 0    disable autosave/restore

Bitfields for SCSI capabilities:
Bit(s)    Description    (Table 03234)
 7    modify data pointers
 6    wide bus (32 bits)
 5    wide bus (16 bits)
 4    synchronous transfers
 3    linked commands
 2    reserved
 1    tagged queueing
 0    soft reset

Bitfields for CAM asynchronous event capabilities:
Bit(s)    Description    (Table 03235)
 31-24    vendor-specific
 23-8    reserved
 7    new devices found during rescan
 6    SIM module deregistered
 5    SIM module registered
 4    sent bus device reset to target
 3    SCSI AEN
 2    reserved
 1    unsolicited reselection
 0    unsolicited SCSI bus reset

Format of Six-Byte SCSI Command Descriptor Block (CDB):
Offset    Size    Description    (Table 03236)
 00h    BYTE    operation code (see #03239)
 01h    BYTE    logical unit number (bits 7-5), SCSI-1/SCSI-2
        MSB of logical block address (bits 4-0)
 02h    WORD    logical block address (low word)
 04h    BYTE    transfer length
 05h    BYTE    control byte
SeeAlso: #03237,#03238

Format of Ten-Byte SCSI Command Descriptor Block (CDB):
Offset    Size    Description    (Table 03237)
 00h    BYTE    operation code (see #03239)
 01h    BYTE    logical unit number (bits 7-5), SCSI-1/SCSI-2
        reserved in SCSI-3
 02h    DWORD    logical block address (low word)
 06h    BYTE    reserved
 07h    WORD    transfer length
 09h    BYTE    control byte
SeeAlso: #03236,#03238

Format of Twelve-Byte SCSI Command Descriptor Block (CDB):
Offset    Size    Description    (Table 03238)
 00h    BYTE    operation code (see #03239)
 01h    BYTE    logical unit number (bits 7-5), SCSI-1/SCSI-2
        reserved in SCSI-3
 02h    DWORD    logical block address (low word)
 06h    DWORD    transfer length
 0Ah    BYTE    reserved
 0Bh    BYTE    control byte
SeeAlso: #03236,#03237

(Table 03239)
Values for SCSI CDB operation code for direct-access devices:
 00h    Test Unit Ready
 01h    Rezero Unit
 03h    Request Sense
 04h    Format Unit
 07h    Reassign Blocks
 08h    Read (6-byte CDB)
 0Ah    Write (6-byte CDB)
 0Bh    Seek (6-byte CDB)
 12h    Inquiry
 15h    Mode Select (6-byte CDB)
 16h    Reserve
 17h    Release
 18h    Copy
 1Ah    Mode Sense (6-byte CDB)
 1Bh    Start/Stop Unit
 1Ch    Receive Diagnostic Results
 1Dh    Send Diagnostic
 1Eh    Prevent/Allow Medium Removal
 25h    Read Capacity
 28h    Read (10-byte CDB)
 2Ah    Write (10-byte CDB)
 2Bh    Seek (10-byte CDB)
 2Eh    Write and Verify
 2Fh    Verify
 30h    Search Data High
 31h    Search Data Equal
 32h    Search Data Low
 33h    Set Limits
 34h    Prefetch
 35h    Synchronize Cache
 36h    Lock/Unlock Cache
 37h    Read Defect Data
 39h    Compare
 3Ah    Copy and Verify
 3Bh    Write Buffer
 3Ch    Read Buffer
 3Eh    Read Long
 3Fh    Write Long
 40h    Change Definition
 41h    Write Same
 4Ch    Log Select
 4Dh    Log Sense
 55h    Mode Select (10-byte CDB)
 5Ah    Mode Sense (10-byte CDB)
SeeAlso: #03236,#03237,#03238

(Table 03240)
Values completion callback function is called with:
    interrupts disabled
    ES:BX -> completed CCB

(Table 03241)
Values asynchronous callback function is called with:
    AH = opcode
    AL = path ID generating callback
    DH = target ID causing event
    DL = LUN causing event
    CX = data byte count (if applicable)
    ES:BX -> data buffer (if applicable)
Return: all registers preserved
--------d-4F8200CX8765-----------------------
INT 4F - Common Access Method SCSI interface rev 2.3 - INSTALLATION CHECK
    AX = 8200h
    CX = 8765h
    DX = CBA9h
Return: AH = 00h if installed
        CX = 9ABCh
        DX = 5678h
        ES:DI -> "SCSI_CAM"
SeeAlso: AX=8100h,INT 4B"Common Access Method"
--------N-50---------------------------------
INT 50 - TIL Xpert AIM (X.25)
    AH = function
--------H-50---------------------------------
INT 50 - IRQ0 relocated by DESQview
Range:    INT 50 to INT F8, selected automatically
Notes:    this is the default location for older versions; DESQview v2.26+
      searches for unused ranges of interrupts and uses the lowest
      available range in its list for relocating these IRQs and the next
      lowest for relocating IRQ8-IRQ15
    a range of eight interrupts starting at a multiple of 8 is considered
      available if all vectors are identical and it has not been excluded
      with an /XB:nn commandline switch
    the list of ranges for v2.26 is 50h,58h,68h,78h,F8h (if < two of these
      are available, F8h and then 50h are used anyway)
    the list of ranges for v2.31+ is 68h,78h,88h-B8h,F8h (if < two of these
      are available, F8h and then F0h are used anyway)
SeeAlso: INT 08"IRQ0",INT 51"DESQview",INT 54"DESQview",INT 58"DESQview"
SeeAlso: INT D8"Screen Thief"
--------H-50---------------------------------
INT 50 - IRQ0 relocated by IBM 3278 emulation control program
SeeAlso: INT 51"IBM 3278"
--------H-50---------------------------------
INT 50 - IRQ0 relocated by OS/2 v1.x
SeeAlso: INT 51"OS/2"
----------50---------------------------------
INT 50 - TI Professional PC - FATAL SOFTWARE ERROR TRAP
Desc:    the default handler generates a System Error message and halts the
      computer such that only Ctrl-Alt-Del can restart operation
Note:    documented as "for system use only"; intended for multi-tasking
      software
SeeAlso: INT 40"TI Professional",INT 4F"TI Professional"
SeeAlso: INT 51"TI Professional",INT 53"TI Professional"
--------V-500000-----------------------------
INT 50 - Vanderaart TEXT WINDOWS, PC Thuis Shell - OPEN TEXT WINDOW
    AX = 0000h
    ES:BX -> name string or ES:0000h if none
    CH,CL = row,column of upper left corner
    DH,DL = row,column of lower right corner
Return: AX = window handle or
        0000h if not installed
        FFFFh on error
SeeAlso: AX=0001h,AX=0002h"TEXT WINDOWS"
--------V-500001-----------------------------
INT 50 - Vanderaart TEXT WINDOWS, PC Thuis Shell - CLOSE TEXT WINDOW
    AX = 0001h
    DI = window handle
SeeAlso: AX=0000h
--------V-500002-----------------------------
INT 50 - Vanderaart TEXT WINDOWS - PUT CHARACTER IN WINDOW
    AX = 0002h
    BL = character
    BH = attribute
    DL = column
    DH = row
    DI = window handle
Return: AX = status
        0000h if successful
        FFFFh if outside window
SeeAlso: AX=0000h
--------l-500002-----------------------------
INT 50 - PC Thuis Organizer Shell - PLOT TEXT
    AX = 0002h
    ES:BX -> text string
    DH,DL = row,column of upper left corner
    DI = window handle
Return: AX = status
        0000h successful (text fits in window)
        FFFFh error
Program: The PC Thuis Organizer Shell was written by John Vanderaart and
      published in the June/July 1990 issue of PC Thuis Power magazine
--------V-500003-----------------------------
INT 50 - Vanderaart TEXT WINDOWS - OUTPUT LINE TO WINDOW
    AX = 0003h
    ES:BX -> text string
    CX = string length (0000h if ASCIZ string)
    DL = position (FFh centered, else flush left)
    DH = starting row
    DI = window handle
Return: AX = status
        0000h successful
        FFFFh did not fit in window
--------l-500003-----------------------------
INT 50 - PC Thuis Organizer Shell - WRITE FILE
    AX = 0003h
    ES:BX -> data to be written
    CX = number of bytes to write
    DS:SI -> filename
Return: AX = status
        0000h successful
        FFFFh error
SeeAlso: AX=0004h"Shell"
--------V-500004-----------------------------
INT 50 - Vanderaart TEXT WINDOWS - GET KEY
    AX = 0004h
    CH = type
        00h any key
        01h 'J' or 'N' (Dutch for yes/no)
Return: AX = key
SeeAlso: INT 16/AH=00h
--------l-500004-----------------------------
INT 50 - PC Thuis Organizer Shell - READ FILE
    AX = 0004h
    ES:BX -> buffer for data
    CX = number of bytes to read or 0000h for entire file
    DL = file type
        01h setting shell
        02h setting sterm
        03h INT21 file
    DS:SI -> filename
Return: AX = status
        0000h successful
        FFFFh error
Note:    file type numbers are maintained by John Vanderaart; if a new file type
      is needed, a type number should be requested from him through the
      magazine:
        PC Thuis BV
        Spaarne 55
        2011 CE HAARLEM
        The Netherlands
SeeAlso: AX=0003h"Shell"
--------V-500005-----------------------------
INT 50 - Vanderaart TEXT WINDOWS - CHANGE ATTRIBUTE
    AX = 0005h
    BL = new attribute
    CH,CL = row,column of upper left corner
    DH,DL = row,column of lower right corner
    DI = window handle
--------l-500005-----------------------------
INT 50 - PC Thuis Organizer Shell - PROMPT YES/NO
    AX = 0005h
    ES:BX -> prompt string (ES:0000h if no prompt)
Return: AX = key pressed
        0000h "J" (Dutch "Ja" = "Yes")
        FFFFh "N" (Dutch "Nee" = "No")
Program: The PC Thuis Organizer Shell was written by John Vanderaart and
      published in the June/July 1990 issue of PC Thuis Power magazine
SeeAlso: AX=0008h"PC Thuis"
--------V-500006-----------------------------
INT 50 - Vanderaart TEXT WINDOWS - EDIT LINE IN WINDOW
    AX = 0006h
    ES:BX -> text string
    CH = type of input (see #03242)
    DH,DL = row,column of upper left corner
    DI = window handle
Return: AX = key which terminated entry
        0000h Enter
        0001h Esc
        0002h Down arrow
        0003h Up arrow
        0004h F10

(Table 03242)
Values for type of input to Vanderaart Text Windows:
 00h    everything
 01h    uppercase only
 02h    positive numbers
 03h    Dutch postal code ("9999 AA")
 04h    'J' or 'N' (Dutch yes/no)
 05h    telephone or FAX number
 06h    positive or negative number
 07h    date (dd/mm/yy)
 08h    money
 09h    '1' through '8'
 0Ah    '1' through '4'
 0Bh    uppercase filenames
--------l-500006-----------------------------
INT 50 - PC Thuis Organizer Shell - ALERT USER
    AX = 0006h
    ES:BX -> string
--------l-500007-----------------------------
INT 50 - PC Thuis Organizer Shell - DO LINE
    AX = 0007h
    ES:BX -> text string
    CX = string length in bytes (0000h if NUL-terminated)
    DL = FFh to center string, else flush left
    DH = upper left row
    DI = window handle
Return: AX = status
        0000h successful
        FFFFh error
Program: The PC Thuis Organizer Shell was written by John Vanderaart and
      published in the June/July 1990 issue of PC Thuis Power magazine
SeeAlso: AX=0008h
--------l-500008-----------------------------
INT 50 - PC Thuis Organizer Shell - DO MENU
    AX = 0008h
    ES:BX -> menu structure
Return: AL = index 1 or FFh if not selected
    AH = index 2 or FFh if not selected
    BL = index 3 or FFh if not selected
    BH = index 4 or FFh if not selected
SeeAlso: AX=0005h"PC Thuis",AX=0007h,AX=000Ch
--------l-500009-----------------------------
INT 50 - PC Thuis Organizer Shell - MESSAGE ON
    AX = 0009h
    ES:BX -> message string
SeeAlso: AX=000Ah
--------l-50000A-----------------------------
INT 50 - PC Thuis Organizer Shell - MESSAGE OFF
    AX = 000Ah
SeeAlso: AX=0009h
--------l-50000B-----------------------------
INT 50 - PC Thuis Organizer Shell - CHANGE ATTRIBUTE
    AX = 000Bh
    BL = new attribute
    CH,CL = row,column of upper left corner
    DH,DL = row,column of lower right corner
    DI = window handle
--------l-50000C-----------------------------
INT 50 - PC Thuis Organizer Shell - DO REQUEST
    AX = 000Ch
    ES:BX -> request structure
Return: AX = status
        0000h confirmed
        FFFFh denied
SeeAlso: AX=0008h
--------l-50000D-----------------------------
INT 50 - PC Thuis Organizer Shell - EDIT LINE
    AX = 000Dh
    ES:BX -> text string
    CL = length
    CH = input type (see #03243)
    DH,DL = row,column of upper left corner
    DI = window handle
Return: AX = result code
Program: The PC Thuis Organizer Shell was written by John Vanderaart and
      published in the June/July 1990 issue of PC Thuis Power magazine

Bitfields for input type:
Bit(s)    Description    (Table 03243)
 0    force uppercase
 1    integer
 2    no spaces allowed
 3    no cursor keys
--------l-50000E-----------------------------
INT 50 - PC Thuis Organizer Shell - PLOT CHARACTER
    AX = 000Eh
    BL = character
    BH = attribute
    DH,DL = row,column at which to plot
    DI = window handle
Return: AX = status
        0000h successful
        FFFFh errror
--------l-50000F-----------------------------
INT 50 - PC Thuis Organizer Shell - EMPTY WINDOW
    AX = 000Fh
    BL = character
    BH = attribute
    DI = window handle
--------l-500010-----------------------------
INT 50 - PC Thuis Organizer Shell - TRACE MENU
    AX = 0010h
    ES:BX -> first menu structure
    CL = hotkey to look up
Return: AL = index 1 or FFh if not selected
    AH = index 2 or FFh if not selected
    BL = index 3 or FFh if not selected
    BH = index 4 or FFh if not selected
Index:    hotkeys;PC Thuis Organizer Shell
--------l-500011-----------------------------
INT 50 - PC Thuis Organizer Shell - MOVE MEMORY
    AX = 0011h
    DS:SI -> source
    ES:DI -> destination
    CX = number of bytes to move (0000h = until NUL string terminator???)
SeeAlso: AX=0012h
--------l-500012-----------------------------
INT 50 - PC Thuis Organizer Shell - COMPARE MEMORY
    AX = 0012h
    DS:SI -> source
    ES:DI -> destination
    CX = number of bytes to compare (0000h=until NUL string terminator???)
Return: AX = status
        0000h same
        FFFFh different
SeeAlso: AX=0011h
--------l-500013-----------------------------
INT 50 - PC Thuis Organizer Shell - GET KEY
    AX = 0013h
    CH = type flags
        bit 0: force uppercase
        bit 1: integer
        bit 2: no spaces
Return: AX = keystroke
--------l-500014-----------------------------
INT 50 - PC Thuis Organizer Shell - SCROLL WINDOW
    AX = 0014h
    BL = direction
        06h up
        07h down
    BH = attribute
    DI = window handle
SeeAlso: INT 10/AH=06h,INT 10/AH=07h
--------l-500015-----------------------------
INT 50 - PC Thuis Organizer Shell - GET MEMORY HANDLE
    AX = 0015h
    BL = handle size
        00h 65536 bytes (64K)
        01h 65535 bytes (64K-1)
        02h 32768 bytes (32K)
        03h 32767 bytes (32K-1)
Return: AX = segment
Program: The PC Thuis Organizer Shell was written by John Vanderaart and
      published in the June/July 1990 issue of PC Thuis Power magazine
SeeAlso: INT 21/AH=48h
--------H-51---------------------------------
INT 51 - IRQ1 relocated by DESQview
Range:    INT 51 to INT F9, selected automatically
Note:    this is the default location for older versions; see INT 50"DESQview"
      for details of interrupt relocation
SeeAlso: INT 50"DESQview",INT 54"DESQview",INT 58"DESQview"
--------H-51---------------------------------
INT 51 - IRQ1 relocated by IBM 3278 emulation control program
SeeAlso: INT 50"IBM 3278",INT 54"IBM 3278"
--------H-51---------------------------------
INT 51 - IRQ1 relocated by OS/2 v1.x
SeeAlso: INT 50"OS/2",INT 54"OS/2"
----------51---------------------------------
INT 51 - TI Professional PC - RESTART TIMING EVENT
    AX = timer count in 25ms intervals
    DS:DI -> timing-event table (see #03244)
Note:    documented as "for system use only"; intended for multi-tasking
      software
SeeAlso: INT 50"TI Professional",INT 52"TI Professional"

Format of TI Professional PC timing event table:
Offset    Size    Description    (Table 03244)
 00h    WORD    offset of next event table entry
 02h    BYTE    normally unused (FFh)
 03h    BYTE    flags:
        bit 7 set if timing event active
        bits 6-0 not used by BIOS (0), but could be used by option ROMs
 04h    WORD    timeout count (decremented every 25ms when active)
 06h    WORD    offset of event handler (in segment F400h) to call on event
          timeout; the F400h segment allows addressing both system ROMs
          and the first 16K of memory (due to the 1M memory wraparound)
--------b-51---------------------------------
INT 51 - Tandy 2000 - KEYBOARD SERVICES
Note:    this interrupt is identical to INT 16 on Tandy 2000
SeeAlso: INT 16/AH=00h,INT 16/AH=01h,INT 16/AH=02h,INT 16/AH=04h"Tandy"
SeeAlso: INT 16/AH=04h,INT 4A"Tandy 2000",INT 4C"Tandy 2000",INT 52"Tandy 2000"
--------H-52---------------------------------
INT 52 - IRQ2 relocated by DESQview
Range:    INT 52 to INT FA, selected automatically
Note:    this is the default location for older versions; see INT 50"DESQview"
      for details of interrupt relocation
SeeAlso: INT 50"DESQview",INT 54"DESQview",INT 58"DESQview"
--------H-52---------------------------------
INT 52 - IRQ2 relocated by IBM 3278 emulation control program, OS/2 v1.x
SeeAlso: INT 50"IBM 3278",INT 51"OS/2"
----------52---------------------------------
INT 52 - TI Professional PC - CANCEL TIMING EVENT
    DS:DI -> timing-event table (see #03244)
Note:    documented as "for system use only"; intended for multi-tasking
      software
SeeAlso: INT 51"TI Professional",INT 53"TI Professional"
--------b-52---------------------------------
INT 52 - Tandy 2000 - VIDEO SERVICES
Note:    this interrupt is identical to INT 10
SeeAlso: INT 10/AH=00h,INT 10/AH=01h,INT 10/AH=08h,INT 10/AH=0Eh
SeeAlso: INT 4A"Tandy 2000",INT 51"Tandy 2000",INT 53"Tandy 2000"
--------H-53---------------------------------
INT 53 - IRQ3 relocated by DESQview
Range:    INT 53 to INT FB, selected automatically
Note:    this is the default location for older versions; see INT 50"DESQview"
      for details of interrupt relocation
SeeAlso: INT 50"DESQview",INT 54"DESQview",INT 58"DESQview"
--------H-53---------------------------------
INT 53 - IRQ3 relocated by IBM 3278 emulation control program, OS/2 v1.x
SeeAlso: INT 50"IBM 3278",INT 51"OS/2"
----------53---------------------------------
INT 53 - TI Professional PC - SVC INTERFACE
Notes:    documented as "for system use only"; intended for multi-tasking
      software
    this interrupt is not used by the BIOS; the default handler generates
      a system error trap (see INT 51"TI Professional")
SeeAlso: INT 50"TI Professional",INT 54"TI Professional"
--------b-53---------------------------------
INT 53 - Tandy 2000 - SERIAL COMMUNICATIONS
Note:    this interrupt is identical to INT 14 on Tandy 2000
SeeAlso: INT 14/AH=00h"SERIAL",INT 14/AH=01h,INT 14/AH=02h,INT 14/AH=03h
SeeAlso: INT 14/AH=04h"Tandy 2000",INT 52"Tandy 2000",INT 54"Tandy 2000"
--------N-53---------------------------------
INT 53 - WEB??? - API
    BX = function
        0000h ???
        AX = ???
        Return: AX = ???
        0004h ???
        0009h ???
        0015h
        AX = ???
        DX = ???
        0017h
Return: ???
InstallCheck:    check for the signature "WEBCO" immediately prior to the
      interrupt handler
Note:    the above calls are made by Show Partner F/X v3.6 (see INT 10/AH=53h)
Index:    installation check;unknown|installation check;WEBCO
--------H-54---------------------------------
INT 54 - IRQ4 relocated by DESQview
Range:    INT 54 to INT FC, selected automatically
Note:    this is the default location for older versions; see INT 50"DESQview"
      for details of interrupt relocation
SeeAlso: INT 50"DESQview",INT 58"DESQview"
--------H-54---------------------------------
INT 54 - IRQ4 relocated by IBM 3278 emulation control program, OS/2 v1.x
SeeAlso: INT 51"IBM 3278",INT 51"OS/2"
----------54---------------------------------
INT 54 - TI Professional PC - ACTIVATE TASK SUBROUTINE
Notes:    documented as "for system use only"; intended for multi-tasking
      software
    this interrupt is not used by the BIOS; the default handler generates
      a system error trap (see INT 51"TI Professional")
SeeAlso: INT 50"TI Professional",INT 53"TI Professional"
--------b-54---------------------------------
INT 54 - Tandy 2000 - LINE PRINTER
Note:    this interrupt is identical to INT 17 on Tandy 2000
SeeAlso: INT 17/AH=00h,INT 17/AH=01h,INT 17/AH=02h,INT 4A"Tandy 2000"
SeeAlso: INT 53"Tandy 2000",INT 55"Tandy 2000"
--------X-545400-----------------------------
INT 54 U - Toshiba PCMCIA2 - INSTALLATION CHECK
    AX = 5400h
Return: AX = 0054h if installed
        CX:DX -> INT function handler
--------H-55---------------------------------
INT 55 - IRQ5 relocated by DESQview
Range:    INT 55 to INT FD, selected automatically
Note:    this is the default location for older versions; see INT 50"DESQview"
      for details of interrupt relocation
SeeAlso: INT 50"DESQview",INT 58"DESQview"
--------H-55---------------------------------
INT 55 - IRQ5 relocated by IBM 3278 emulation control program, OS/2 v1.x
SeeAlso: INT 51"IBM 3278",INT 51"OS/2"
--------b-55---------------------------------
INT 55 - TI Professional PC - RESERVED FOR FUTURE USE
Notes:    documented as "for system use only"; intended for multi-tasking
      software
    this interrupt is not used by the BIOS; the default handler generates
      a system error trap (see INT 51"TI Professional")
SeeAlso: INT 50"TI Professional",INT 56"TI Professional"
--------b-55---------------------------------
INT 55 - Tandy 2000 - SYSTEM CLOCK
Note:    this interrupt is identical to INT 1A on Tandy 2000
SeeAlso: INT 1A/AH=00h,INT 1A/AH=01h,INT 1A/AH=02h"Tandy 2000"
SeeAlso: INT 1A/AH=03h"Tandy 2000",INT 54"Tandy 2000",INT 56"Tandy 2000"
--------H-56---------------------------------
INT 56 - IRQ6 relocated by DESQview
Range:    INT 56 to INT FE, selected automatically
Note:    this is the default location for older versions; see INT 50"DESQview"
      for details of interrupt relocation
SeeAlso: INT 50"DESQview",INT 58"DESQview"
--------H-56---------------------------------
INT 56 - IRQ6 relocated by IBM 3278 emulation control program, OS/2 v1.x
SeeAlso: INT 51"IBM 3278",INT 51"OS/2"
--------b-56---------------------------------
INT 56 - TI Professional PC - RESERVED FOR FUTURE USE
Notes:    documented as "for system use only"; intended for multi-tasking
      software
    this interrupt is not used by the BIOS; the default handler generates
      a system error trap (see INT 51"TI Professional")
SeeAlso: INT 50"TI Professional",INT 55"TI Professional"
--------b-56---------------------------------
INT 56 - Tandy 2000 - FLOPPY DISK SERVICES
Note:    this interrupt is identical to INT 13 on Tandy 2000
SeeAlso: INT 13/AH=00h,INT 13/AH=01h,INT 13/AH=02h,INT 13/AH=03h
SeeAlso: INT 4A"Tandy 2000",INT 51"Tandy 2000",INT 55"Tandy 2000"
--------H-57---------------------------------
INT 57 - IRQ7 relocated by DESQview
Range:    INT 57 to INT FF, selected automatically
Note:    this is the default location for older versions; see INT 50"DESQview"
      for details of interrupt relocation
SeeAlso: INT 50"DESQview",INT 58"DESQview"
--------H-57---------------------------------
INT 57 - IRQ7 relocated by IBM 3278 emulation control program, OS/2 v1.x
SeeAlso: INT 51"IBM 3278",INT 51"OS/2"
--------b-57---------------------------------
INT 57 C - TI Professional PC - CRT MAPPING HOOK
    AX/BX/CX/DX/BP/SI/DI same as on entry to CRT subroutine (e.g. INT 49)
    DS = BIOS system segment
    ES = DE00h
Return: DF/IF flags must be preserved
    ES,DS,BP preserved
    AX,BX,CX,DX,SI,DI may be changed as necessary to modify the original
      call
Desc:    hooking this vector permits programs to intercept or modify all
      screen output, including both application calls to INT 49 and
      calls generated internally by the BIOS which bypass INT 49
Note:    by default, this vector points at an IRET instruction
SeeAlso: INT 49/AH=01h"TI",INT 50"TI Professional"
--------H-58---------------------------------
INT 58 - IRQ8 relocated by DESQview 2.26+
Range:    INT 58 to INT F8, selected automatically
Note:    this is the default, but other INTs may be used (see INT 50"DESQview")
SeeAlso: INT 50"DESQview",INT 59"DESQview",INT 70
--------H-58---------------------------------
INT 58 - IRQ0 relocated by DoubleDOS
SeeAlso: INT 08
--------b-58---------------------------------
INT 58 C - TI Professional PC - SYSTEM TIMER 25ms HOOK
Desc:    called from the hardware timer tick interrupt, after executing the
      first four BIOS timing events, updating the system clock, invoking
      INT 5A if required, saving registers, and switching to a temporary
      stack (the one reserved for IRQ3)
Notes:    the handler for this interrupt may destroy AX,BX,DI,ES but must
      preserve all other registers; 8 WORDs of stack space are available,
      of which at most 4 may be used if the handler enables interrupts
    if the handler switches stacks (because more than 4/8 WORDs are
      required), the original stack must be restored before chaining to
      the previous handler
SeeAlso: INT 43"TI Professional",INT 4C"TI Professional"
SeeAlso: INT 5A"TI Professional"
--------H-59---------------------------------
INT 59 - IRQ9 relocated by DESQview 2.26+
Range:    INT 59 to INT F9, selected automatically
Note:    this is the default, but other INTs may be used (see INT 50"DESQview")
SeeAlso: INT 50"DESQview",INT 58"DESQview",INT 5A"DESQview",INT 71
--------H-59---------------------------------
INT 59 - IRQ1 relocated by DoubleDOS
SeeAlso: INT 09
--------b-59---------------------------------
INT 59 - TI Professional PC - COMMON ROM HARDWARE INTERRUPT EXIT VECTOR
Desc:    all hardware interrupts on the TI Pro jump indirectly to the handler
      pointed at by this interrupt vector to finish their handling of
      the hardware interrupt
Notes:    the default handler decrements the interrupt count, restores registers
      (including the stack pointer), sends an EOI to the interrupt
      controller, and finally does an IRET
    can be used by multitaskers which need to get control after every
      hardware interrupt
SeeAlso: INT 40"TI Professional",INT 47"TI Professional"
SeeAlso: INT 53"TI Professional"
--------V-59---------------------------------
INT 59 - GSS Computer Graphics Interface (GSS*CGI)
    DS:DX -> block of 5 array pointers
Return: CF set on error
        AX = error code
    CF clear if successful
        AX = return code
Note:    INT 59 is the means by which GSS*CGI language bindings communicate with
      GSS*CGI device drivers and the GSS*CGI device driver controller.
    also used by the IBM Graphic Development Toolkit
--------H-5A---------------------------------
INT 5A - IRQ10 relocated by DESQview 2.26+
Range:    INT 5A to INT FA, selected automatically
Note:    this is the default, but other INTs may be used (see INT 50"DESQview")
SeeAlso: INT 50"DESQview",INT 59"DESQview",INT 5B"DESQview",INT 72
--------H-5A---------------------------------
INT 5A - IRQ2 relocated by DoubleDOS
SeeAlso: INT 0A"IRQ2"
--------N-5A---------------------------------
INT 5A - PC Cluster adapter BIOS entry address
    ???
Return: ???
SeeAlso: INT 5B"PC Cluster"
--------b-5A---------------------------------
INT 5A - TI Professional PC - SYSTEM TIMER 100ms HOOK
Desc:    called from the hardware timer tick interrupt, after executing the
      first four BIOS timing events, updating the system clock, saving
      registers, and switching to a temporary stack (the one reserved
      for IRQ3), but before calling INT 58
    no details available
Notes:    this interrupt is invoked on every fourth timer interrupt
    the handler for this interrupt may destroy AX,BX,DI,ES but must
      preserve all other registers; 8 WORDs of stack space are available,
      of which at most 4 may be used if the handler enables interrupts
    if the handler switches stacks (because more than 4/8 WORDs are
      required), the original stack must be restored before chaining to
      the previous handler
SeeAlso: INT 43"TI Professional",INT 4C"TI Professional"
SeeAlso: INT 58"TI Professional"
--------H-5B---------------------------------
INT 5B - IRQ11 relocated by DESQview 2.26+
Range:    INT 5B to INT FB, selected automatically
Note:    this is the default, but other INTs may be used (see INT 50"DESQview")
SeeAlso: INT 50"DESQview",INT 5A"DESQview",INT 5C"DESQview",INT 73
--------H-5B---------------------------------
INT 5B - IRQ3 relocated by DoubleDOS
SeeAlso: INT 0B
--------N-5B---------------------------------
INT 5B - PC cluster adapter - RELOCATED INT 19
SeeAlso: INT 19,INT 5A"PC Cluster"
--------N-5B---------------------------------
INT 5B - AT&T Starlan Extended NetBIOS (variable length names)
    ES:BX -> Network Control Block (see #03245)
Return: AL = status (see #03248)
SeeAlso: INT 5C"NetBIOS"

Format of Starlan Network Control Block:
Offset    Size    Description    (Table 03245)
 00h    BYTE    ncb_command (see also #03250)
        70h send net Break
 01h    BYTE    ncb_retcode
 02h    BYTE    ncb_lsn
 03h    BYTE    ncb_num
 04h    DWORD    -> ncb_buffer
 08h    WORD    ncb_length
 0Ah 16 BYTEs    ncb_callname
 1Ah 16 BYTEs    ncb_name
 2Ah    BYTE    ncb_rto
 2Bh    BYTE    ncb_sto
 2Ch    DWORD    -> ncb_post    /* int (far *ncb_post)(); */
 30h    BYTE    ncb_lana_num
 31h    BYTE    ncb_cmd_cplt
 32h    DWORD    -> ncb_vname
 36h    BYTE    ncb_vnamelen
 37h  9 BYTEs    ncb_reserve
Note:    fields 00h-31h are the same as for a standard NetBIOS NCB (see #03249)
--------N-5B---------------------------------
INT 5B - Microsoft Network Transport Layer Interface
Note:    used by MS-NET for executing network commands
SeeAlso: INT 5C"NetBIOS"
--------N-5B---------------------------------
INT 5B - used by Alloy NTNX
--------N-5B---------------------------------
INT 5B - ISOLAN Multi Protocol Software
    ES:BX -> Transfer Control Block (see #03246)
Return: AL = status
Note:    this software interface allows multiple protocols/software packages
      to access a BICC 411x network card

Format of ISOLAN Transfer Control Block:
Offset    Type    Description    (Table 03246)
 00h    BYTE    command code
        B3h Status
        F2h Activate
        F3h Deactivate
        F4h Send Data
 01h    BYTE    command identity
 02h    BYTE    virtual circuit ID
 03h    WORD    buffer length
 05h    DWORD    buffer pointer
 09h    BYTE    expedited data flag
 0Ah    BYTE    cancelable flag
 0Bh 16 BYTEs    local network address
 1Bh 16 BYTEs    remote network address
 2Bh    DWORD    asynchronous notification routine
 30h    DWORD    local network number
 34h    DWORD    remote network number
 38h    BYTE    call timeout
 39h    BYTE    not used
 3Ah  8 BYTEs    reserved
 42h    BYTE    command code extension
 43h    WORD    Blue Book MAC type
--------b-5B---------------------------------
INT 5B C - TI Professional PC - KEYBOARD MAPPING HOOK
    CF set
    AH = shift state (see #03247)
    AL = scan code (see #03214)
Return:    BX, CX, DI, ES may be destroyed
    various return methods are supported:
        IRET, AX unchanged: process keystroke normally
        IRET, AL = FFh: discard keystroke
        IRET, AX changed: process modified keystroke
        chain to old INT 5B: allow other handlers to look at (possibly
          modified) keystroke in AX
        RETF 2, CF clear: place returned AX into keyboard buffer without
          any further processing
Notes:    invoked by the keyboard ISR, and used to remap the keyboard
    if CF is clear on entry, some other handler has processed the
      keystroke and the current handler should not modify it, instead
      performing a RETF 2 or IRET (after clearing CF on the stack)
    when requesting that a value be placed directly into the keyboard
      buffer, AL and AH may not *both* be nonzero (the TI does not
      return scan codes as part of the key code for non-extended keys)
SeeAlso: INT 15/AH=4Fh,INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5C"TI Professional",INT 5D"TI Professional"
SeeAlso: INT 5E"TI Professional",INT 5F"TI Professional"

Bitfields for TI Professional PC keyboard mapping hook shift states:
Bit(s)    Description    (Table 03247)
 7    CAPS LOCK is on
 6-4    reserved (0)
 3    repeated key
 2    Shift is pressed
 1    Alt is pressed
 0    Ctrl is pressed
--------U-5B5254DL04-------------------------
INT 5B U - SitBack v3.02R - GET ???
    AX = 5254h
    DL = 04h
Return: ES:BX -> ??? in resident portion
Program: SitBack is a background file backup utility by SitBack Technologies,
      Inc. which initiates backups whenever the system is idle
SeeAlso: AX=8485h/DL=71h,AX=8485h/DL=72h
--------U-5B8485DL70-------------------------
INT 5B U - SitBack v3.02R - INSTALLATION CHECK
    AX = 8485h
    DL = 70h
Return: CX = 8485h if installed
        DX:AX -> ??? (configuration data?)
Program: SitBack is a background file backup utility by SitBack Technologies,
      Inc. which initiates backups whenever the system is idle
SeeAlso: AX=5254h/DL=04h,AX=8485h/DL=78h
--------U-5B8485DL71-------------------------
INT 5B U - SitBack v3.02R - SET ??? FLAG AND GET ??? ADDRESS
    AX = 8485h
    DL = 71h
Return: ES:BX -> FAR entry point to ???
Note:    the flag which is modified is located at the address returned by
       AX=5254h/DL=04h
SeeAlso: AX=8485h/DL=72h
--------U-5B8485DL72-------------------------
INT 5B U - SitBack v3.02R - CLEAR ??? FLAG
    AX = 8485h
    DL = 72h
Note:    the flag which is modified is located at the address returned by
       AX=5254h/DL=04h
SeeAlso: AX=8485h/DL=71h
--------U-5B8485DL73-------------------------
INT 5B U - SitBack v3.02R - ???
    AX = 8485h
    DL = 73h
    ???
Return: ???
--------U-5B8485DL74-------------------------
INT 5B U - SitBack v3.02R - ???
    AX = 8485h
    DL = 74h
    ???
Return: ???
--------U-5B8485DL75-------------------------
INT 5B U - SitBack v3.02R - ???
    AX = 8485h
    DL = 75h
    CX = ???
Return: ???
SeeAlso: AX=8485h/DL=76h
--------U-5B8485DL76-------------------------
INT 5B U - SitBack v3.02R - ???
    AX = 8485h
    DL = 76h
    CX = ???
Return: ???
Note:    conditionally calls the code for AX=8485h/DL=75h
SeeAlso: AX=8485h/DL=75h
--------U-5B8485DL77-------------------------
INT 5B U - SitBack v3.02R - SET ??? FLAG
    AX = 8485h
    DL = 77h
--------U-5B8485DL78-------------------------
INT 5B U - SitBack v3.02R - GET RESIDENT DATA SEGMENT
    AX = 8485h
    DL = 78h
Return: CX = 5342h if supported
        ES = AX = segment of TSR data
SeeAlso: AX=8485h/DL=70h,AX=8485h/DL=79h
--------U-5B8485DL79-------------------------
INT 5B U - SitBack v3.02R - GET DTA
    AX = 8485h
    DL = 79h
Return: CX = 5342h if supported
        ES:BX -> DTA set by last INT 21/AH=1Ah
Note:    this function is provided by SBOS.EXE rather than SB.EXE
SeeAlso: INT 21/AH=1Ah
--------U-5B8485DL7A-------------------------
INT 5B U - SitBack v3.02R - TOGGLE ???
    AX = 8485h
    DL = 7Ah
Return: CX = 5342h if supported
        AL = new value of ??? (00h or 01h)
--------N-5C---------------------------------
INT 5C - NetBIOS INTERFACE
    ES:BX -> network control block (NCB) (see #03249)
Return: AL = status (see #03248)
Program: NetBIOS was developed by Sytek, Inc. in 1984 as a high-level
      programming interface to the IBM PC Network; the first implementation
      was a ROM BIOS extension on Sytek's PCnet LAN adapter card, but many
      current networks support NetBIOS as the session layer.
Note:    The Sytek PCnet card uses DMA 3.
SeeAlso: INT 2A/AH=01h,INT 2A/AH=04h,INT 5B"Extended NetBIOS"

(Table 03248)
Values for NetBIOS status:
 00h    successful
 01h    bad buffer size
 03h    invalid NETBIOS command
 05h    timeout
 06h    receive buffer too small
 07h    No-ACK command failed
 08h    bad session number
 09h    LAN card out of memory
 0Ah    session closed
 0Bh    command has been cancelled
 0Dh    name already exists
 0Eh    local name table full
 0Fh    name still in use, can't delete
 11h    local session table full
 12h    remote PC not listening
 13h    bad NCB_NUM field
 14h    no answer to CALL or no such remote
 15h    name not in local name table
 16h    duplicate name
 17h    bad delete
 18h    abnormal end
 19h    name error, multiple identical names in use
 1Ah    bad packet
 21h    network card busy
 22h    too many commands queued
 23h    bad LAN card number
 24h    command finished while cancelling
 26h    command can't be cancelled
 30h    name defined by another process (OS/2)
 34h    NetBIOS environment not defined, must issue reset (OS/2)
 35h    required operating system resources exhausted (OS/2)
 36h    maximum applications exceeded (OS/2)
 37h    no SAPs available for NetBIOS (OS/2)
 38h    requested resources not available (OS/2)
 40h    Lana System Error
 41h    Lana Remote Hot Carrier
 42h    Lana Local Hot Carrier
 43h    Lana No Carrier Detected
 44h    unusual network condition
 45h-4Dh hardware error
 4Eh    token ring is broken
 4Fh    token ring error
 50h    adapter malfunction
 F7h    error in explicit INITIALIZE
 F8h    error in implicit OPEN
 F9h    TOKREUI internal error
 FAh    hardware adapter testing
 FBh    NetBIOS emulator not found
 FCh    OPEN or OPEN_SAP failure
 FDh    unexpected adapter closure
 FFh    NetBIOS busy (command pending)

Format of NetBIOS Network Control Block:
Offset    Size    Description    (Table 03249)
 00h    BYTE    command code (see #03250)
 01h    BYTE    return code (see #03248)
 02h    BYTE    local session number (LSN)
 03h    BYTE    "ncb_num" datagram table entry from ADD NAME
 04h    DWORD    -> I/O buffer
 08h    WORD    length of data in buffer
 0Ah 16 BYTEs    remote system to call
 1Ah 16 BYTEs    network name of local machine
 2Ah    BYTE    receive timeout in 1/2 seconds
 2Bh    BYTE    send timeout in 1/2 seconds
 2Ch    DWORD    -> FAR post handler    /* int (far *ncb_post)(); */
 30h    BYTE    network adapter number on which to execute command
        00h-03h IBM NetBIOS specs
        F0h-FFh Eicon NABios interface (see also INT 7B"Eicon")
 31h    BYTE    command completion code (see #03248)
 32h 14 BYTEs    reserved for network card

(Table 03250)
Values for NetBIOS command code field in NCB:
 10h    start session with NCB_NAME name (call)
 11h    listen for call
 12h    end session with NCB_NAME name (hangup)
 14h    send data via NCB_LSN
 15h    receive data from a session
 16h    receive data from any session
 17h    send multiple data buffers
 20h    send unACKed message (datagram)
 21h    receive datagram
 22h    send broadcast datagram
 23h    receive broadcast datagram
 30h    add name to name table
 31h    delete name from name table
 32h    reset adapter card and tables
 33h    get adapter status (see #03251)
 34h    status of all sessions for name (see #03253)
 35h    cancel
 36h    add group name to name table
 48h    send data and receive data (LAN Manager NETBEUI.DOS)
 70h    unlink from IBM remote program (no F0h function)
 71h    send data without ACK
 72h    send multiple buffers without ACK
 72h    UngermannBass Register (conflicts with above function)
 73h    UngermannBass SendNmc
 74h    UngermannBass Callniu
 75h    UngermannBass Calladdr
 76h    UngermannBass Listenaddr
 77h    UngermannBass SendPkt
 78h    find name
 78h    UngermannBass RcvPkt (conflicts with above function)
 79h    token-ring protocol trace
 79h    UngermannBass SendAttn (conflicts with above function)
 7Ah    UngermannBass RcvAttn
 7Bh    UngermannBass Listenniu
 7Ch    UngermannBass RcvRaw
 7Dh    UngermannBass SendNmc2
 7Fh    Beame&Whiteside BWNB installation check (returns with return code and
      completion code both set to 03h, while invalid functions return only
      return code field set to 03h)
Note:    OR any of the above except 70h with 80h for non-waiting call

Format of NetBIOS structure "astatus":
Offset    Size    Description    (Table 03251)
 00h  6 BYTEs as_id
 06h    BYTE  as_jumpers
 07h    BYTE  as_post
 08h    BYTE  as_major
 09h    BYTE  as_minor
 0Ah    WORD  as_interval
 0Ch    WORD  as_crcerr
 0Eh    WORD  as_algerr
 10h    WORD  as_colerr
 12h    WORD  as_abterr
 14h    DWORD as_tcount
 18h    DWORD as_rcount
 1Ch    WORD  as_retran
 1Eh    WORD  as_xresrc
 20h  8 BYTEs as_res0
 28h    WORD  as_ncbfree
 2Ah    WORD  as_ncbmax
 2Ch    WORD  as_ncbx
 2Eh  4 BYTEs as_res1
 32h    WORD  as_sespend
 34h    WORD  as_msp
 36h    WORD  as_sesmax
 38h    WORD  as_bufsize
 3Ah    WORD  as_names
 3Ch 16 name structures     as_name (see #03252)
Note:    it has been reported that the first field should be 16 bytes instead
      of six (shifthing all remaining fields by ten bytes)

Format of NetBIOS structure "name":
Offset    Size    Description    (Table 03252)
 00h 16 BYTEs "nm_name" symbolic name
 10h    BYTE  "nm_num" number associated with name
 11h    BYTE  nm_status

Format of NetBIOS structure "sstatus":
Offset    Size    Description    (Table 03253)
 00h    BYTE    number of sessions being reported
 01h    BYTE    number of sessions with this name
 02h    BYTE    number of outstanding receive datagrams
 03h    BYTE    number of outstanding ReceiveAnys
 04h    var    session structures (see #03254)

Format of NetBIOS structure "session":
Offset    Size    Description    (Table 03254)
 00h    BYTE    local session number
 01h    BYTE    state
        01h listen pending
        02h call pending
        03h session established
        04h hangup pending
        05h hangup done
        06h session aborted
 02h 16 BYTEs    local name
 12h 16 BYTEs    remote name
 22h    BYTE    number of outstanding receives
 23h    BYTE    number of outstanding sends/chainsends
--------H-5C---------------------------------
INT 5C - IRQ12 relocated by DESQview 2.26+
Range:    INT 5C to INT FC, selected automatically
Note:    this is the default, but other INTs may be used (see INT 50"DESQview")
SeeAlso: INT 50"DESQview",INT 5B"DESQview",INT 5D"DESQview",INT 74
--------H-5C---------------------------------
INT 5C - IRQ4 relocated by DoubleDOS
SeeAlso: INT 0C
--------N-5C---------------------------------
INT 5C - TOPS INTERFACE
    ES:BX -> Network Control Block
Note:    TOPS card uses DMA 1, 3 or none.
--------N-5C---------------------------------
INT 5C - ATALK.SYS - AppleTalk INTERFACE
    DX:BX -> control block (see #03256)
Return: none
InstallCheck:    test for the signature "AppleTalk" 16 bytes prior to the
      interrupt handler
Range:    INT 5Ch to INT 70h
Index:    installation check;ATALK.SYS|installation check;AppleTalk interface

(Table 03255)
Values for ATALK.SYS command code:
 01h    "AT_INIT"        initialize the driver
 02h    "AT_KILL"
 03h    "AT_GETNETINFO" get current network info incl init status
 04h    "AT_GETCLOCKTICKS"
 05h    "AT_STARTTIMER"
 06h    "AT_RESETTIMER"
 07h    "AT_CANCELTIMER"
 10h    "LAP_INSTALL"
 11h    "LAP_REMOVE"
 12h    "LAP_WRITE"
 13h    "LAP_READ"
 14h    "LAP_CANCEL"
 20h    "DDP_OPENSOCKET"
 21h    "DDP_CLOSESOCKET"
 22h    "DDP_WRITE"
 23h    "DDP_READ"
 24h    "DDP_CANCEL"
 30h    "NBP_REGISTER"
 31h    "NBP_REMOVE"
 32h    "NBP_LOOKUP"
 33h    "NBP_CONFIRM"
 34h    "NBP_CANCEL"
 35h    "ZIP_GETZONELIST"
 36h    "ZIP_GETMYZONE"
 37h    "ZIP_TAKEDOWN"
 38h    "ZIP_BRINGUP"
 40h    "ATP_OPENSOCKET"
 41h    "ATP_CLOSESOCKET"
 42h    "ATP_SENDREQUEST"
 43h    "ATP_GETREQUEST"
 44h    "ATP_SENDRESPONSE"
 45h    "ATP_ADDRESPONSE"
 46h    "ATP_CANCELTRANS"
 47h    "ATP_CANCELRESPONSE"
 48h    "ATP_CANCELREQUEST"
 50h    "ASP_GETPARMS"
 51h    "ASP_CLOSESESSION"
 52h    "ASP_CANCEL"
 53h    "ASP_INIT"
 54h    "ASP_KILL"
 55h    "ASP_GETSESSION"
 56h    "ASP_GETREQUEST"
 57h    "ASP_CMDREPLY"
 58h    "ASP_WRTCONTINUE"
 59h    "ASP_WRTREPLY"
 5Ah    "ASP_CLOSEREPLY"
 5Bh    "ASP_NEWSTATUS"
 5Ch    "ASP_ATTENTION"
 5Dh    "ASP_GETSTATUS"
 5Eh    "ASP_OPENSESSION"
 5Fh    "ASP_COMMAND"
 60h    "ASP_WRITE"
 61h    "ASP_GETATTENTION"
 70h    "PAP_OPEN"
 71h    "PAP_CLOSE"
 72h    "PAP_READ"
 73h    "PAP_WRITE"
 74h    "PAP_STATUS"
 75h    "PAP_REGNAME"
 76h    "PAP_REMNAME"
 77h    "PAP_INIT"
 78h    "PAP_NEWSTATUS"
 79h    "PAP_GETNEXTJOB"
 7Ah    "PAP_KILL"
 7Bh    "PAP_CANCEL"

Format of AppleTalk control block:
Offset    Size    Description    (Table 03256)
 00h    WORD    command code (see #03255)
        OR with the following flags
        8000h start command then return
        4000h wait for interrupt service to complete
 02h    WORD    returned status
        0000h success (already initialized if func 01h)
 04h    DWORD    pointer to completion function
 08h    WORD    network number
 0Ah    BYTE    node ID
---if general func (01h,03h), control block continues:
 0Bh    BYTE    "inf_abridge"
 0Ch    WORD    "inf_config"
 0Eh    DWORD    pointer to buffer
 12h    WORD    buffer size
---if DDP function (20h-24h), control block continues:
 0Bh    BYTE    "ddp_addr_socket"
 0Ch    BYTE    "ddp_socket"
 0Dh    BYTE    "ddp_type"
 0Eh    DWORD    pointer to buffer
 12h    WORD    buffer size
 14h    BYTE    "ddp_chksum"
---if Name Binding Protocol (30h-34h), control block continues:
 0Bh    BYTE    "nbp_addr_socket"
 0Ch    WORD    "nbp_toget"
 0Eh    DWORD    pointer to buffer (see #03257)
 12h    WORD    buffer size
 14h    BYTE    "nbp_interval"
 15h    BYTE    "nbp_retry"
 16h    DWORD    "nbp_entptr"
---if AppleTalk Transaction Protocol (42h), control block continues:
 0Bh    BYTE    "atp_addr_socket"
 0Ch    WORD    "atp_socket"
 0Eh    DWORD    pointer to buffer
 12h    WORD    buffer size
 14h    BYTE    "atp_interval"
 15h    BYTE    "atp_retry"
 16h    BYTE    ATP flags
        bit 5: exactly one transaction
 17h    BYTE    "atp_seqbit"
 18h    BYTE    transaction ID
 19h  4 BYTEs    ATP user bytes
 1Dh    BYTE    number of BDS buffers
 1Eh    BYTE    number of BDS responses
 1Fh    DWORD    pointer to BDS buffers (see #03258)

Format of Name Binding Protocol Name-to-Address binding entries for NBP_LOOKUP:
Offset    Size    Description    (Table 03257)
 00h    WORD    "tup_address_network"
 02h    BYTE    "tup_address_notid"
 03h    BYTE    "tup_address_socket"
 04h    BYTE    "tup_enum"
 05h 99 BYTEs    name

Format of BDS entries:
Offset    Size    Description    (Table 03258)
 00h    DWORD    pointer to buffer
 04h    WORD    size of buffer
 06h    WORD    BDS data size
 08h  4 BYTEs    "bds_userbytes"
--------N-5C---------------------------------
INT 5C - IBM 802.2 INTERFACE (LLC)
    ES:BX -> CCB (see #03259)
Return: none

Format of IBM 802.2 CCB:
Offset    Size    Description    (Table 03259)
 00h    BYTE    adapter
 01h    BYTE    command code
 02h    BYTE    return code
 03h    BYTE    work
 04h    DWORD    pointer to ???
 08h    DWORD    pointer to completion function???
 0Ch    DWORD    pointer to parameters???
--------N-5C---------------------------------
INT 5C - $25 LAN - INSTALLATION CHECK
Notes:    current versions only check whether the vector is 0000h:0000h or not
    future versions are supposed to have the signature "NET" in the three
      bytes preceding the INT 5C handler
--------b-5C0100-----------------------------
INT 5C C - TI Professional PC - KEYBOARD PAUSE KEY VECTOR
    AX = 0100h
    CF clear
Return: CF clear
        AX = keystroke to be placed into keyboard buffer
    CF set
        AX ignored
Desc:    toggle a pause flag which is checked by the CRT Device Service Routine
      (see INT 49/AH=01h"TI") and causes it to temporarily halt the
      machine on the next video-related function (until a key is pressed)
SeeAlso: INT 09"IRQ1",INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5B"TI Professional",INT 5D"TI Professional"
SeeAlso: INT 5E"TI Professional",INT 5F"TI Professional"
--------N-5C04-------------------------------
INT 5C - $25 LAN - CHECK IF CONNECTION ALIVE
    AH = 04h
    AL = COM port (0 = default)
    CX = wait count in character times (should be at least 100)
Return: ZF set if link alive
--------H-5D---------------------------------
INT 5D - IRQ13 relocated by DESQview 2.26+
Range:    INT 5D to INT FD, selected automatically
Note:    this is the default, but other INTs may be used (see INT 50"DESQview")
SeeAlso: INT 50"DESQview",INT 5C"DESQview",INT 5E"DESQview",INT 75
--------H-5D---------------------------------
INT 5D - IRQ5 relocated by DoubleDOS
SeeAlso: INT 0D"IRQ5",INT 5C"DoubleDOS"
--------b-5D---------------------------------
INT 5D C - TI Professional PC - KEYBOARD BREAK KEY VECTOR
    CF clear
    AX = 0000h
Return: CF clear
        AX = keystroke to place into keyboard buffer
    CF set
        AX ignored
Desc:    invoked by the keyboard ISR when Shift-BrkPause is pressed
Note:    the default handler is a simple IRET instruction
SeeAlso: INT 09"IRQ1",INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5B"TI Professional",INT 5C"TI Professional"
SeeAlso: INT 5E"TI Professional",INT 5F"TI Professional"
--------H-5E---------------------------------
INT 5E - IRQ14 relocated by DESQview 2.26+
Range:    INT 5E to INT FE, selected automatically
Note:    this is the default, but other INTs may be used (see INT 50"DESQview")
SeeAlso: INT 50"DESQview",INT 5D"DESQview",INT 5F"DESQview",INT 76
--------H-5E---------------------------------
INT 5E - IRQ6 relocated by DoubleDOS
SeeAlso: INT 0E,INT 5D"DoubleDOS"
--------b-5E---------------------------------
INT 5E C - TI Professional PC - KEYBOARD PRINT-SCREEN VECTOR
    CF set
Return: CF clear
        AX = keystroke to be placed into keyboard buffer
    CF set
        AX ignored
Desc:    hook to dump the screen to the printer
Notes:    hooked by TI MS-DOS, which provides a PRTSCRN character device which
      can invoke screen prints when a decimal digit (indicating the type
      of screen dump) is written to it
    the TI MS-DOS print-screen routine allows selective dumps of text
      only, graphics only, or text and graphics superimposed, in either
      normal or reverse, by pressing the appropriate keystroke combination:
      Shift-Print, Ctrl-Print, Alt-Print, Shift-Alt-Print, Ctrl-Alt-Print,
      or Shift-Ctrl-Print.
    the BIOS default routine for this vector is an IRET
SeeAlso: INT 05"PRINT SCREEN",INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5B"TI Professional",INT 5C"TI Professional"
SeeAlso: INT 5D"TI Professional",INT 5F"TI Professional"
--------H-5F---------------------------------
INT 5F - IRQ15 relocated by DESQview 2.26+
Range:    INT 5F to INT FF, selected automatically
Note:    this is the default, but other INTs may be used (see INT 50"DESQview")
SeeAlso: INT 50"DESQview",INT 5E"DESQview",INT 77
--------H-5F---------------------------------
INT 5F - IRQ7 relocated by DoubleDOS
SeeAlso: INT 0F,INT 5E"DoubleDOS"
--------b-5F---------------------------------
INT 5F C - TI Professional PC - KEYBOARD QUEUEING VECTOR
Return: all registers preserved
Desc:    hook for multitaskers to be informed when a keypress is placed in the
      keyboard buffer
Note:    the default handler is a simple IRET instruction
SeeAlso: INT 09,INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5B"TI Professional",INT 5C"TI Professional"
SeeAlso: INT 5D"TI Professional",INT 5E"TI Professional"
--------b-5F00-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - SET VIDEO MODE
    AH = 00h
    AL = video mode
        03h text,CGA color (100LX/200LX)
        06h 640x200 CGA graphics (100LX/200LX)
        07h text, system manager compliant
        20h 240x128 mono graphics, system manager compliant
        87h text, not system manager compliant
        A0h 240x128 mono graphics, not system manager compliant
Notes:    the defaults after setting the mode to graphics are (0,0) logical
      origin, full-screen clip region, (0,0) pen location, pen color 1,
      pixel replacement FORCE, line type and fill mask all bits set
    modes 03h and 06h can also be set with the standard INT 10/AH=00h
SeeAlso: INT 0F"HP 95LX",INT 10/AH=00h,INT 15/AX=4DD4h
--------b-5F01-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - SET FILL MASK
    AH = 01h
    ES:DI -> 8-byte fill mask
Note:    the fill mask represents an 8x8 pixel box and is repeated as necessary
      when drawing filled rectangles; it is always aligned with the byte
      boundaries of video memory, regardless of the actual boundaries of
      the rectangle
SeeAlso: AH=02h
--------b-5F02-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - GET CURRENT GRAPHICS INFO
    AH = 02h
    ES:DI -> graphics info record (see #03260)
Return: DX:AX -> filled graphics info record (for return to high-level langs)

Format of HP 95LX graphics info record:
Offset    Size    Description    (Table 03260)
 00h    BYTE    current video mode
 01h    BYTE    default video mode
 02h    WORD    display width in pixels
 04h    WORD    display height in pixels
 06h    WORD    current pen column
 08h    WORD    current pen row
 0Ah    WORD    current line type
 0Ch    WORD    current replacement rule
 0Eh    WORD    current pen color
 10h    WORD    current leftmost column of clip region
 12h    WORD    current rightmost column of clip region
 14h    WORD    current topmost row of clip region
 16h    WORD    current bottommost row of clip region
 18h    WORD    current column of logical origin
 1Ah    WORD    current row of logical origin
 1Ch  8 BYTEs    current fill mask
--------b-5F03-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - SET LOGICAL ORIGIN
    AH = 03h
    CX = column
    DX = row
SeeAlso: AH=04h
--------b-5F04-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - SET CLIP REGION
    AH = 04h
    CX = left-most column
    DX = top-most row
    SI = right-most column
    DI = bottom-most row
SeeAlso: AH=03h
--------b-5F05-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - DRAW RECTANGLE
    AH = 05h
    AL = fill type
        00h outline, using current line type and color
        01h solid, using current color
        02h pattern, using current fill mask and color
    DX,CX = row,column of other corner of rectangle
Note:    the rectangle is drawn starting at the current pen position
SeeAlso: AH=01h,AH=06h,AH=07h
--------b-5F06-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - DRAW LINE
    AH = 06h
    DX,CX = row,column of end point
Note:    the line is drawn starting at the current pen position
SeeAlso: AH=05h,AH=07h
--------b-5F07-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - PLOT POINT
    AH = 07h
    DX,CX = row,column of point
Note:    also sets pen position to the specified point
SeeAlso: AH=06h,AH=08h,AH=0Ch
--------b-5F08-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - MOVE PEN
    AH = 08h
    DX,CX = row,column of new pen position
SeeAlso: AH=07h,AH=09h
--------b-5F09-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - SET PEN COLOR
    AH = 09h
    AL = new color (00h = white, 01h = black)
SeeAlso: AH=08h,AH=0Ah,AH=0Bh
--------b-5F0A-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - SET REPLACEMENT RULE
    AH = 0Ah
    AL = new replacement rule
        00h force
        01h AND
        02h OR
        03h XOR
        ---100LX/200LX---
        04h InvForce
        05h InvAND
        06h    InvOR
        07h InvXOR
        08h Txt
SeeAlso: AH=01h,AH=09h,AH=0Bh
--------b-5F0B-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - SET LINE TYPE
    AH = 0Bh
    CX = new line type
Note:    the line type specifies 16 bits which are repeated over and over while
      drawing the pixels of a line
SeeAlso: AH=09h,AH=0Ah
--------b-5F0C-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - GET PIXEL
    AH = 0Ch
    DX,CX = row,column of pixel to read
Return: AX = pixel color
SeeAlso: AH=07h
--------b-5F0D-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - GET IMAGE
    AH = 0Dh
    DX,CX = row,column of first corner
    BP,SI = row,column of second corner
    ES:DI -> image buffer (see #03261)
Note:    the specified corners are included in the saved image
SeeAlso: AH=0Eh

Format of HP 95LX image buffer:
Offset    Size    Description    (Table 03261)
 00h    WORD    number of planes (always 01h on HP 95LX)
 02h    WORD    number of bits/pixel (always 01h on HP 95LX)
 04h    WORD    image width in pixels
 06h    WORD    image height in pixels
 08h  N BYTEs    image data
        requires (WIDTH+7)/8 * HEIGHT bytes
--------b-5F0E-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - PUT IMAGE
    AH = 0Eh
    AL = replacement rule (see #03262)
    DX,CX = row,column of top left corner
    ES:DI -> image buffer (see #03261)
Note:    if the specified image does not fit completely on the screen, this call
      does nothing
SeeAlso: AH=0Dh

Bitfields for replacement rule:
Bit(s)    Description    (Table 03262)
 2    invert image before applying rule
 1-0    function (00 force, 01 AND, 10 OR, 11 XOR)
--------b-5F0F-------------------------------
INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - WRITE TEXT
    AH = 0Fh
    AL = rotate flag (if nonzero, rotate 90 degrees counter-clockwise)
    DX,CX = row,column of first character's top left corner
    ES:DI -> ASCIZ text
--------b-5F10-------------------------------
INT 5F - HP 100LX/200LX GRAPHICS PRIMITIVES - GET FONT POINTER
    AH = 10h
    CX = font size of desired font
        0808h  8x8    small  (80x25 text)
        0A0Bh 11x10 medium (64x18 text)
        100Ch 12x16 large  (40x16 text)
Return: DX:AX -> ptr to font or 0000h:fontID# if built-in font
SeeAlso: AH=11h
--------b-5F11-------------------------------
INT 5F - HP 100LX/200LX GRAPHICS PRIMITIVES - SET CURRENT FONT
    AH = 11h
    ES:DI -> ptr to font or 0000h:fontID# for built-in font
Note:    this function should be called immediately after AH=10h with the
      pointer supplied by that call
SeeAlso: AH=10h
--------!---Section--------------------------