PC World Komputer 1996 February

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;Text for INT2GUID conversion program, topic 21. ;INT2GUID converts INTERRUP.LST files to input for GUIDE. ; ;NB! When updating, remember to update the release number in the next ;paragraph, and in the beginning the text. ; ;This file contains tables extracted from the INTERRUP.LST file release 37. ;Tabs in the extracted text were filtered to 1 - 8 spaces. ; ;This file includes 4 extra topics. Reserve additionally 6 topics, or a ;total of 10. ; ;Topic headings are included in the GUIDE main index unless the configuration ;file specifies mask 0x8000. ; PSP Format, Environment Block, Country Specific Information, Error List This entry gives access to tables extracted from the INTERRUP.LST file, release 37. 22PSP + Env. Program Segment Prefix Format + Environment 23Country Specific Information 24Errors Returned by DOS Funtion Calls 25EXE *.EXE File Header etc. ; !TOPIC 22 PSP Format !! 0x8000 !NOINDEX !! 0 ; --------D-2126------------------------------- INT 21 - DOS 1+ - CREATE NEW PROGRAM SEGMENT PREFIX AH = 26h DX = segment at which to create PSP (see below) Notes: new PSP is updated with memory size information; INTs 22h, 23h, 24h taken from interrupt vector table; the parent PSP field is set to 0 (DOS 2+) DOS assumes that the caller's CS is the segment of the PSP to copy SeeAlso: AH=4Bh,AH=50h,AH=51h,AH=55h,AH=62h,AH=67h Format of PSP: Offset Size Description 00h 2 BYTEs INT 20 instruction for CP/M CALL 0 program termination the CDh 20h here is often used as a signature for a valid PSP 02h WORD segment of first byte beyond memory allocated to program 04h BYTE unused filler 05h BYTE CP/M CALL 5 service request (FAR JMP to 000C0h) BUG: (DOS 2+) PSPs created by INT 21/AH=4Bh point at 000BEh 06h WORD CP/M compatibility--size of first segment for .COM files 08h 2 BYTEs remainder of FAR JMP at 05h 0Ah DWORD stored INT 22 termination address 0Eh DWORD stored INT 23 control-Break handler address 12h DWORD DOS 1.1+ stored INT 24 critical error handler address 16h WORD segment of parent PSP 18h 20 BYTEs DOS 2+ Job File Table, one byte per file handle, FFh = closed 2Ch WORD DOS 2+ segment of environment for process 2Eh DWORD DOS 2+ process's SS:SP on entry to last INT 21 call 32h WORD DOS 3+ number of entries in JFT (default 20) 34h DWORD DOS 3+ pointer to JFT (default PSP:0018h) 38h DWORD DOS 3+ pointer to previous PSP (default FFFFFFFFh in 3.x) used by SHARE in DOS 3.3 3Ch BYTE apparently unused by DOS versions <= 6.00 3Dh BYTE apparently used by some versions of APPEND 3Eh BYTE (Novell NetWare) flag: next byte initialized if CEh 3Fh BYTE (Novell Netware) Novell task number if previous byte is CEh 40h 2 BYTEs DOS 5+ version to return on INT 21/AH=30h 42h WORD (MSWin3) selector of next PSP (PDB) in linked list Windows keeps a linked list of Windows programs only 44h 4 BYTEs unused by DOS versions <= 6.00 48h BYTE (MSWindows3) bit 0 set if non-Windows application (WINOLDAP) 49h 7 BYTEs unused by DOS versions <= 6.00 50h 3 BYTEs DOS 2+ service request (INT 21/RETF instructions) 53h 2 BYTEs unused in DOS versions <= 6.00 55h 7 BYTEs unused in DOS versions <= 6.00; can be used to make first FCB into an extended FCB 5Ch 16 BYTEs first default FCB, filled in from first commandline argument overwrites second FCB if opened 6Ch 16 BYTEs second default FCB, filled in from second commandline argument overwrites beginning of commandline if opened 7Ch 4 BYTEs unused 80h 128 BYTEs commandline / default DTA command tail is BYTE for length of tail, N BYTEs for the tail, followed by a BYTE containing 0Dh Notes: in DOS v3+, the limit on simultaneously open files may be increased by allocating memory for a new open file table, filling it with FFh, copying the first 20 bytes from the default table, and adjusting the pointer and count at 34h and 32h. However, DOS will only copy the first 20 file handles into a child PSP (including the one created on EXEC). network redirectors based on the original MS-Net implementation use values of 80h-FEh in the open file table to indicate remote files; Novell NetWare reportedly also uses values of 80h-FEh MS-DOS 5.00 incorrectly fills the FCB fields when loading a program high; the first FCB is empty and the second contains the first parameter some DOS extenders place protected-mode values in various PSP fields such as the "parent" field, which can confuse PSP walkers. Always check either for the CDh 20h signature or that the suspected PSP is at the beginning of a memory block which owns itself (the preceding paragraph should be a valid MCB with "owner" the same as the suspected PSP). Novell NetWare updates the fields at offsets 3Eh and 3Fh without checking that a legal PSP segment is current; see AH=50h for further discussion Format of environment block: Offset Size Description 00h N BYTEs first environment variable, ASCIZ string of form "var=value" N BYTEs second environment variable, ASCIZ string ... N BYTEs last environment variable, ASCIZ string of form "var=value" BYTE 00h ---DOS 3+--- WORD number of strings following environment (normally 1) N BYTEs ASCIZ full pathname of program owning this environment other strings may follow ; !TOPIC 23 Country Info !! 0x8000 !NOINDEX !! 0 ; --------D-2138------------------------------- INT 21 - DOS 2+ - GET COUNTRY-SPECIFIC INFORMATION AH = 38h --DOS 2.x-- AL = 00h get current-country info DS:DX -> buffer for returned info (see below) Return: CF set on error AX = error code (02h) CF clear if successful AX = country code (MS-DOS 2.11 only) buffer at DS:DX filled --DOS 3+-- AL = 00h for current country AL = 01h thru 0FEh for specific country with code <255 AL = 0FFh for specific country with code >= 255 BX = 16-bit country code DS:DX -> buffer for returned info (see below) Return: CF set on error AX = error code (02h) CF clear if successful BX = country code DS:DX buffer filled Note: this function is not supported by the Borland DPMI host, but no error is returned; as a workaround, one should allocate a buffer in conventional memory with INT 31/AX=0100h and simulate an INT 21 with INT 31/AX=0300h SeeAlso: AH=65h,INT 10/AX=5001h,INT 2F/AX=110Ch,INT 2F/AX=1404h Format of PC-DOS 2.x country info: Offset Size Description 00h WORD date format 0 = USA mm dd yy 1 = Europe dd mm yy 2 = Japan yy mm dd 02h BYTE currency symbol 03h BYTE 00h 04h BYTE thousands separator char 05h BYTE 00h 06h BYTE decimal separator char 07h BYTE 00h 08h 24 BYTEs reserved Format of MS-DOS 2.x,DOS 3+ country info: Offset Size Description 00h WORD date format (see above) 02h 5 BYTEs ASCIZ currency symbol string 07h 2 BYTEs ASCIZ thousands separator 09h 2 BYTEs ASCIZ decimal separator 0Bh 2 BYTEs ASCIZ date separator 0Dh 2 BYTEs ASCIZ time separator 0Fh BYTE currency format bit 2 = set if currency symbol replaces decimal point bit 1 = number of spaces between value and currency symbol bit 0 = 0 if currency symbol precedes value 1 if currency symbol follows value 10h BYTE number of digits after decimal in currency 11h BYTE time format bit 0 = 0 if 12-hour clock 1 if 24-hour clock 12h DWORD address of case map routine (FAR CALL, AL = character to map to upper case [>= 80h]) 16h 2 BYTEs ASCIZ data-list separator 18h 10 BYTEs reserved Values for country code: 1 001h United States 2 002h Canadian-French 3 003h Latin America 31 01Fh Netherlands 32 020h Belgium 33 021h France 34 022h Spain 36 024h Hungary (not supported by DR-DOS 5.0) 38 026h Yugoslavia (not supported by DR-DOS 5.0) 39 027h Italy 41 029h Switzerland 42 02Ah Czechoslovakia/Tjekia (not supported by DR-DOS 5.0) 43 02Bh Austria (DR-DOS 5.0) 44 02Ch United Kingdom 45 02Dh Denmark 46 02Eh Sweden 47 02Fh Norway 48 030h Poland (not supported by DR-DOS 5.0) 49 031h Germany 55 037h Brazil (not supported by DR-DOS 5.0) 61 03Dh International English [Australia in DR-DOS 5.0] 81 051h Japan (DR-DOS 5.0, MS-DOS 5.0+) 82 052h Korea (DR-DOS 5.0) 86 056h China (MS-DOS 5.0+) 88 058h Taiwan (MS-DOS 5.0+) 90 05Ah Turkey (MS-DOS 5.0+) 351 15Fh Portugal 354 162h Iceland 358 166h Finland 785 311h Middle East/Saudi Arabia (DR-DOS 5.0,MS-DOS 5.0+) 972 3CCh Israel (DR-DOS 5.0,MS-DOS 5.0+) --------D-2138--DXFFFF----------------------- INT 21 - DOS 3+ - SET COUNTRY CODE AH = 38h DX = FFFFh AL = 01h thru FEh for specific country with code <255 AL = FFh for specific country with code >= 255 BX = 16-bit country code (see AH=38h) Return: CF set on error AX = error code (see AH=59h) CF clear if successful Note: not supported by OS/2 SeeAlso: INT 2F/AX=1403h --------D-2165------------------------------- INT 21 - DOS 3.3+ - GET EXTENDED COUNTRY INFORMATION AH = 65h AL = info ID 01h get general internationalization info 02h get pointer to uppercase table 04h get pointer to filename uppercase table 05h get pointer to filename terminator table 06h get pointer to collating sequence table 07h (DOS 4+) get pointer to Double-Byte Character Set table BX = code page (FFFFh=global code page) DX = country ID (FFFFh=current country) ES:DI -> country information buffer (see below) CX = size of buffer (>= 5) Return: CF set on error AX = error code (see AH=59h) CF clear if successful CX = size of country information returned ES:DI -> country information Notes: AL=05h appears to return same info for all countries and codepages; it has been documented for DOS 5+, but was undocumented in ealier versions NLSFUNC must be installed to get info for countries other than the default subfunctions 02h and 04h are identical under OS/2 SeeAlso: AH=38h,INT 2F/AX=1401h,INT 2F/AX=1402h,INT 2F/AX=14FEh Format of country information: Offset Size Description 00h BYTE info ID ---if info ID = 01h--- 01h WORD size 03h WORD country ID 05h WORD code page 07h 34 BYTEs country-dependent info (see AH=38h) ---if info ID = 02h--- 01h DWORD pointer to uppercase table (see below) ---if info ID = 04h--- 01h DWORD pointer to filename uppercase table (see below) ---if info ID = 05h--- 01h DWORD pointer to filename character table (see below) ---if info ID = 06h--- 01h DWORD pointer to collating table (see below) ---if info ID = 07h (DOS 4+)--- 01h DWORD pointer to DBCS lead byte table (see below) Format of uppercase table: Offset Size Description 00h WORD table size 02h 128 BYTEs uppercase equivalents (if any) of chars 80h to FFh Format of collating table: Offset Size Description 00h WORD table size 02h 256 BYTEs values used to sort characters 00h to FFh Format of filename terminator table: Offset Size Description 00h WORD table size (not counting this word) 02h BYTE ??? (01h for MS-DOS 3.30-6.00) 03h BYTE lowest permissible character value for filename 04h BYTE highest permissible character value for filename 05h BYTE ??? (00h for MS-DOS 3.30-6.00) 06h BYTE first excluded character in range \ all characters in this 07h BYTE last excluded character in range / range are illegal 08h BYTE ??? (02h for MS-DOS 3.30-6.00) 09h BYTE number of illegal (terminator) characters 0Ah N BYTEs characters which terminate a filename: ."/\[]:|<>+=;, Note: partially documented for DOS 5+, but undocumented for earlier versions Format of filename uppercase table: Offset Size Description 00h WORD table size 02h 128 BYTEs uppercase equivalents (if any) of chars 80h to FFh Format of DBCS lead byte table: Offset Size Description 00h WORD length 02h 2N BYTEs start/end for N lead byte ranges WORD 0000h (end of table) --------D-2165------------------------------- INT 21 - DOS 4+ - COUNTRY-DEPENDENT CHARACTER CAPITALIZATION AH = 65h AL = function 20h capitalize character DL = character to capitalize Return: DL = capitalized character 21h capitalize string DS:DX -> string to capitalize CX = length of string 22h capitalize ASCIZ string DS:DX -> ASCIZ string to capitalize Return: CF set on error AX = error code (see AH=59h) CF clear if successful Note: these calls have been documented for DOS 5+, but were undocumented in DOS 4.x. --------D-216523----------------------------- INT 21 U - DOS 4+ internal - DETERMINE IF CHARACTER REPRESENTS YES/NO RESPONSE AX = 6523h DL = character DH = second character of double-byte character (if applicable) Return: CF set on error CF clear if successful AX = type 00h no 01h yes 02h neither yes nor no --------D-2165------------------------------- INT 21 U - DOS 4+ internal - COUNTRY-DEPENDENT FILENAME CAPITALIZATION AH = 65h AL = function A0h capitalize filename character DL = character to capitalize Return: DL = capitalized character A1h capitalize counted filename string DS:DX -> filename string to capitalize CX = length of string A2h capitalize ASCIZ filename DS:DX -> ASCIZ filename to capitalize Return: CF set on error AX = error code (see AH=59h) CF clear if successful Note: nonfunctional in DOS 4.00 through 6.00 due to a bug (the code sets a pointer depending on the high bit of AL, but doesn't clear the bit before branching by function number). --------D-216601----------------------------- INT 21 - DOS 3.3+ - GET GLOBAL CODE PAGE TABLE AX = 6601h Return: CF set on error AX = error code (see AH=59h) CF clear if successful BX = active code page (see AX=6602h) DX = system code page SeeAlso: AX=6602h --------D-216602----------------------------- INT 21 - DOS 3.3+ - SET GLOBAL CODE PAGE TABLE AX = 6602h BX = active code page (see below) DX = system code page (active page at boot time) Return: CF set on error AX = error code (see AH=59h) CF clear if successful SeeAlso: AX=6601h,INT 2F/AX=14FFh Values for code page: 437 US 850 Multilingual 852 Slavic/Latin II (DOS 5+) 857 Turkish 860 Portugal 861 Iceland 863 Canada (French) 865 Norway/Denmark ; !TOPIC 24 Error Codes !! 0x8000 !NOINDEX !! 0 ; --------D-2159--BX0000----------------------- INT 21 - DOS 3+ - GET EXTENDED ERROR INFORMATION AH = 59h BX = 0000h Return: AX = extended error code (see below) BH = error class (see below) BL = recommended action (see below) CH = error locus (see below) ES:DI may be pointer (see error code list below) CL, DX, SI, BP, and DS destroyed Notes: functions available under DOS 2.x map the true DOS 3+ error code into one supported under DOS 2.x you should call this function to retrieve the true error code when an FCB or DOS 2.x call returns an error under DR-DOS 5.0, this function does not use any of the DOS-internal stacks and may thus be called at any time SeeAlso: AH=59h/BX=0001h,AX=5D0Ah,INT 2F/AX=122Dh Values for extended error code: 00h (0) no error 01h (1) function number invalid 02h (2) file not found 03h (3) path not found 04h (4) too many open files (no handles available) 05h (5) access denied 06h (6) invalid handle 07h (7) memory control block destroyed 08h (8) insufficient memory 09h (9) memory block address invalid 0Ah (10) environment invalid (usually >32K in length) 0Bh (11) format invalid 0Ch (12) access code invalid 0Dh (13) data invalid 0Eh (14) reserved 0Fh (15) invalid drive 10h (16) attempted to remove current directory 11h (17) not same device 12h (18) no more files ---DOS 3+--- 13h (19) disk write-protected 14h (20) unknown unit 15h (21) drive not ready 16h (22) unknown command 17h (23) data error (CRC) 18h (24) bad request structure length 19h (25) seek error 1Ah (26) unknown media type (non-DOS disk) 1Bh (27) sector not found 1Ch (28) printer out of paper 1Dh (29) write fault 1Eh (30) read fault 1Fh (31) general failure 20h (32) sharing violation 21h (33) lock violation 22h (34) disk change invalid ES:DI -> ASCIZ volume label of required disk 23h (35) FCB unavailable 24h (36) sharing buffer overflow 25h (37) (DOS 4+) code page mismatch 26h (38) (DOS 4+) cannot complete file operation (out of input) 27h (39) (DOS 4+) insufficient disk space 28h-31h reserved 32h (50) network request not supported 33h (51) remote computer not listening 34h (52) duplicate name on network 35h (53) network name not found 36h (54) network busy 37h (55) network device no longer exists 38h (56) network BIOS command limit exceeded 39h (57) network adapter hardware error 3Ah (58) incorrect response from network 3Bh (59) unexpected network error 3Ch (60) incompatible remote adapter 3Dh (61) print queue full 3Eh (62) queue not full 3Fh (63) not enough space to print file 40h (64) network name was deleted 41h (65) network: Access denied 42h (66) network device type incorrect 43h (67) network name not found 44h (68) network name limit exceeded 45h (69) network BIOS session limit exceeded 46h (70) temporarily paused 47h (71) network request not accepted 48h (72) network print/disk redirection paused 49h (73) network software not installed (LANtastic) invalid network version 4Ah (74) unexpected adapter close (LANtastic) account expired 4Bh (75) (LANtastic) password expired 4Ch (76) (LANtastic) login attempt invalid at this time 4Dh (77) (LANtastic v3+) disk limit exceeded on network node 4Eh (78) (LANtastic v3+) not logged in to network node 4Fh (79) reserved 50h (80) file exists 51h (81) reserved 52h (82) cannot make directory 53h (83) fail on INT 24h 54h (84) (DOS 3.3+) too many redirections 55h (85) (DOS 3.3+) duplicate redirection 56h (86) (DOS 3.3+) invalid password 57h (87) (DOS 3.3+) invalid parameter 58h (88) (DOS 3.3+) network write fault 59h (89) (DOS 4+) function not supported on network 5Ah (90) (DOS 4+) required system component not installed 64h (100) (MSCDEX) unknown error 65h (101) (MSCDEX) not ready 66h (102) (MSCDEX) EMS memory no longer valid 67h (103) (MSCDEX) not High Sierra or ISO-9660 format 68h (104) (MSCDEX) door open Values for Error Class: 1 01h out of resource (storage space or I/O channels) 2 02h temporary situation (file or record lock) 3 03h authorization (denied access) 4 04h internal (system software bug) 5 05h hardware failure 6 06h system failure (configuration file missing or incorrect) 7 07h application program error 8 08h not found 9 09h bad format 10 0Ah locked 11 0Bh media error 12 0Ch already exists 13 0Dh unknown Values for Suggested Action: 1 01h retry 2 02h delayed retry 3 03h prompt user to reenter input 4 04h abort after cleanup 5 05h immediate abort 6 06h ignore 7 07h retry after user intervention Values for Error Locus: 1 01h unknown or not appropriate 2 02h block device (disk error) 3 03h network related 4 04h serial device (timeout) 5 05h memory related ; !TOPIC 25 EXE Header etc !! 0x8000 !NOINDEX !! 0 ; --------D-214B------------------------------- INT 21 - DOS 2+ - "EXEC" - LOAD AND/OR EXECUTE PROGRAM AH = 4Bh AL = type of load 00h load and execute 01h load but do not execute 03h load overlay 04h load and execute in background (European MS-DOS 4.0 only) "Exec & Go" (see also AH=80h) DS:DX -> ASCIZ program name (must include extension) ES:BX -> parameter block (see below) CX = mode (subfunction 04h only) 0000h child placed in zombie mode after termination 0001h child's return code discarded on termination Return: CF clear if successful BX,DX destroyed if subfunction 01h, process ID set to new program's PSP; get with INT 21/AH=62h CF set on error AX = error code (01h,02h,05h,08h,0Ah,0Bh) (see AH=59h) Notes: DOS 2.x destroys all registers, including SS:SP under ROM-based DOS, if no disk path characters (colons or slashes) are included in the program name, the name is searched for in the ROM module headers (see below) before searching on disk for functions 00h and 01h, the calling process must ensure that there is enough unallocated memory available; if necessary, by releasing memory with AH=49h or AH=4Ah for function 01h, the AX value to be passed to the child program is put on top of the child's stack for function 03h, DOS assumes that the overlay is being loaded into memory allocated by the caller function 01h was undocumented prior to the release of DOS 5.0 some versions (such as DR-DOS 6.0) check the parameters and parameter block and return an error if an invalid value (such as an offset of FFFFh) is found background programs under European MS-DOS 4.0 must use the new executable format new executables begin running with the following register values AX = environment segment BX = offset of command tail in environment segment CX = size of automatic data segment (0000h = 64K) ES,BP = 0000h DS = automatic data segment SS:SP = initial stack the command tail corresponds to an old executable's PSP:0081h and following, except that the 0Dh is turned into a NUL (00h); new format executables have no PSP under the FlashTek X-32 DOS extender, only function 00h is supported and the pointers are passed in DS:EDX and ES:EBX DR-DOS 6 always loads .EXE-format programs with no fixups above the 64K mark to avoid the EXEPACK bug names for the various executable type understood by various environments: MZ old-style DOS executable NE Windows or OS/2 1.x segmented ("new") executable LE Windows virtual device driver (VxD) linear executable LX variant of LE used in OS/2 2.x W3 Windows WIN386.EXE file; a collection of LE files PE Win32 (Windows NT and Win32s) portable executable based on Unix COFF BUGS: DOS 2.00 assumes that DS points at the current program's PSP Load Overlay (subfunction 03h) loads up to 512 bytes too many if the file contains additional data after the actual overlay SeeAlso: AX=4B05h,AH=4Ch,AH=4Dh,AH=64h"OS/2",AH=8Ah,INT 2E Format of EXEC parameter block for AL=00h,01h,04h: Offset Size Description 00h WORD segment of environment to copy for child process (copy caller's environment if 0000h) 02h DWORD pointer to command tail to be copied into child's PSP 06h DWORD pointer to first FCB to be copied into child's PSP 0Ah DWORD pointer to second FCB to be copied into child's PSP 0Eh DWORD (AL=01h) will hold subprogram's initial SS:SP on return 12h DWORD (AL=01h) will hold entry point (CS:IP) on return Format of EXEC parameter block for AL=03h: Offset Size Description 00h WORD segment at which to load overlay 02h WORD relocation factor to apply to overlay if in .EXE format Format of EXEC parameter block for FlashTek X-32: Offset Size Description 00h PWORD 48-bit far pointer to environment string 06h PWORD 48-bit far pointer to command tail string Format of .EXE file header: Offset Size Description 00h 2 BYTEs .EXE signature, either "MZ" or "ZM" (5A4Dh or 4D5Ah) 02h WORD number of bytes in last 512-byte page of executable 04h WORD total number of 512-byte pages in executable (includes any partial last page) 06h WORD number of relocation entries 08h WORD header size in paragraphs 0Ah WORD minimum paragraphs of memory to allocation in addition to executable's size 0Ch WORD maximum paragraphs to allocate in addition to executable's size 0Eh WORD initial SS relative to start of executable 10h WORD initial SP 12h WORD checksum (one's complement of sum of all words in executable) 14h DWORD initial CS:IP relative to start of executable 18h WORD offset within header of relocation table 40h or greater for new-format (NE,LE,LX,W3,PE,etc.) executable 1Ah WORD overlay number (normally 0000h = main program) ---new executable--- 1Ch 4 BYTEs ??? 20h WORD behavior bits 22h 26 BYTEs reserved for additional behavior info 3Ch DWORD offset of new executable (NE,LE,etc) header within disk file, or 00000000h if plain MZ executable ---Borland TLINK--- 1Ch 2 BYTEs ??? (apparently always 01h 00h) 1Eh BYTE signature FBh 1Fh BYTE TLINK version (major in high nybble, minor in low nybble) 20h 2 BYTEs ??? (v2.0 apparently always 72h 6Ah, v3.0+ seems always 6Ah 72h) ---ARJ self-extracting archive--- 1Ch 4 BYTEs signature "RJSX" (older versions, new signature is "aRJsfX" in the first 1000 bytes of the file) ---LZEXE 0.90 compressed executable--- 1Ch 4 BYTEs signature "LZ09" ---LZEXE 0.91 compressed executable--- 1Ch 4 BYTEs signature "LZ91" ---PKLITE compressed executable--- 1Ch BYTE minor version number 1Dh BYTE bits 0-3: major version bit 4: extra compression bit 5: huge (multi-segment) file 1Eh 6 BYTEs signature "PKLITE" (followed by copyright message) ---LHarc 1.x self-extracting archive--- 1Ch 4 BYTEs unused??? 20h 3 BYTEs jump to start of extraction code 23h 2 BYTEs ??? 25h 12 BYTEs signature "LHarc's SFX " ---LHA 2.x self-extracting archive--- 1Ch 8 BYTEs ??? 24h 10 BYTEs signature "LHa's SFX " (v2.10) or "LHA's SFX " (v2.13) ---TopSpeed C 3.0 CRUNCH compressed file--- 1Ch DWORD 018A0001h 20h WORD 1565h ---PKARCK 3.5 self-extracting archive--- 1Ch DWORD 00020001h 20h WORD 0700h ---BSA (Soviet archiver) self-extracting archive--- 1Ch WORD 000Fh 1Eh BYTE A7h ---LARC self-extracting archive--- 1Ch 4 BYTEs ??? 20h 11 BYTEs "SFX by LARC " ---LH self-extracting archive--- 1Ch 8 BYTEs ??? 24h 8 BYTEs "LH's SFX " ---other linkers--- 1Ch var optional information --- N N DWORDs relocation items Notes: if word at offset 02h is 4, it should be treated as 00h, since pre-1.10 versions of the MS linker set it that way if both minimum and maximum allocation (offset 0Ah/0Ch) are zero, the program is loaded as high in memory as possible the maximum allocation is set to FFFFh by default Format of ROM Module Header: Offset Size Description 00h 2 BYTEs ROM signature 55h, AAh 02h BYTE size of ROM in 512-byte blocks 03h 3 BYTEs POST initialization entry point (near JMP instruction) 06h ROM Program Name List [array] Offset Size Description 00h BYTE length of ROM program's name (00h if end of name list) 01h N BYTEs program name N+1 3 BYTEs program entry point (near JMP instruction) Format of new executable header: Offset Size Description 00h 2 BYTEs "NE" (4Eh 45h) signature 02h 2 BYTEs linker version (major, then minor) 04h WORD offset from start of this header to entry table (see below) 06h WORD length of entry table in bytes 08h DWORD file load CRC (0 in Borland's TPW) 0Ch BYTE program flags bits 0-1 DGROUP type 0 = none 1 = single shared 2 = multiple (unshared) 3 = (null) bit 2: global initialization bit 3: protected mode only bit 4: 8086 instructions bit 5: 80286 instructions bit 6: 80386 instructions bit 7: 80x87 instructions 0Dh BYTE application flags bits 0-2: application type 001 full screen (not aware of Windows/P.M. API) 010 compatible with Windows/P.M. API 011 uses Windows/P.M. API bit 3: is a Family Application (OS/2) bit 5: 0=executable, 1=errors in image bit 6: non-conforming program (valid stack is not maintained) bit 7: DLL or driver rather than application (SS:SP info invalid, CS:IP points at FAR init routine called with AX=module handle which returns AX=0000h on failure, AX nonzero on successful initialization) 0Eh WORD auto data segment index 10h WORD initial local heap size 12h WORD initial stack size (added to data seg, 0000h if SS <> DS) 14h DWORD program entry point (CS:IP), "CS" is index into segment table 18h DWORD initial stack pointer (SS:SP), "SS" is segment index if SS=automatic data segment and SP=0000h, the stack pointer is set to the top of the automatic data segment, just below the local heap 1Ch WORD segment count 1Eh WORD module reference count 20h WORD length of nonresident names table in bytes 22h WORD offset from start of this header to segment table (see below) 24h WORD offset from start of this header to resource table 26h WORD offset from start of this header to resident names table 28h WORD offset from start of this header to module reference table 2Ah WORD offset from start of this header to imported names table (array of counted strings, terminated with a string of length 00h) 2Ch DWORD offset from start of file to nonresident names table 30h WORD count of moveable entry point listed in entry table 32h WORD file alignment size shift count 0 is equivalent to 9 (default 512-byte pages) 34h WORD number of resource table entries 36h BYTE target operating system 00h unknown 01h OS/2 02h Windows 03h European MS-DOS 4.x 04h Windows 386 05h BOSS (Borland Operating System Services) 37h BYTE other EXE flags bit 0: supports long filenames bit 1: 2.X protected mode bit 2: 2.X proportional font bit 3: gangload area 38h WORD offset to return thunks or start of gangload area 3Ah WORD offset to segment reference thunks or length of gangload area 3Ch WORD minimum code swap area size 3Eh 2 BYTEs expected Windows version (minor version first) Note: this header is documented in detail in the Windows 3.1 SDK Programmer's Reference, Vol 4. (The rest of the INT 21 AH = 4Bh was deleted from this table, see the entry in the List for info)