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Assembly Source File | 1984-04-29 | 27.3 KB | 1,065 lines

***************************************************************** * * * SYSIO -- Standard Set of Redirectable I/O Drivers * * for ZCPR2 configured for Richard Conn's ARIES-1 System * * * * 4 February 1982 * * * * Note on Assembly: * * This device driver package is to be assembled by MAC * * (because of the macros) and configured into a file of type * * IO by loading it at 100H via DDT or SID/ZSID and saving the * * result as a COM file. Care should be taken to ensure that * * the package is not larger than the device driver area which * * is reserved for it in memory. * * * ***************************************************************** IOBASE equ 0E800H ;Base Address of I/O Drivers IOBYTE equ 3 ;I/O BYTE INTIOBY equ 000$1$1$001B ;Initial I/O Byte Value ; LST:=TTY ; RDR:, PUN:=Clock ; CON:=CRT ***************************************************************** * * * Disk Serial, MPU Serial, Quad I/O, and Modem Equates * * * ***************************************************************** ; Disk Serial -- Serial Channel on Disk Controller Board (DCE) ; Baud Rate is set at 19,200 Baud in Hardware (DIP Switches) ustat equ 0E3F9H ;USART Status Address ostat equ 8 ;Output Status Bit (TBE) istat equ 4 ;Input Status Bit (RDA) ; MPU Serial -- Serial Channel on CCS Z80 MPU Board (DCE) mpubase equ 20H ;Base address of 8250 on CCS Z80 MPU Board mpudata equ mpubase ;Data I/O Registers mpudll equ mpubase ;Divisor Latch Low mpudlh equ mpubase+1 ;Divisor Latch High mpuier equ mpubase+1 ;Interrupt Enable Register mpulcr equ mpubase+3 ;Line Control Register mpupcr equ mpubase+4 ;Peripheral Control Register mpustat equ mpubase+5 ;Line Status Register mpupsr equ mpubase+6 ;Peripheral Status Register ; MPU Serial RDA and TBE mpurda equ 1 ; Data Available Bit (RDA) mputbe equ 40h ; Transmit Buffer Empty Bit (TBE) ; MPU Serial Baud Rate Values bm00050 equ 2304 ; 50 Baud bm00075 equ 1536 ; 75 Baud bm00110 equ 1047 ; 110 Baud bm00134 equ 857 ; 134.5 Baud bm00150 equ 768 ; 150 Baud bm00300 equ 384 ; 300 Baud bm00600 equ 192 ; 600 Baud bm01200 equ 96 ; 1200 Baud bm01800 equ 64 ; 1800 Baud bm02000 equ 58 ; 2000 Baud bm02400 equ 48 ; 2400 Baud bm03600 equ 32 ; 3600 Baud bm04800 equ 24 ; 4800 Baud bm07200 equ 16 ; 7200 Baud bm09600 equ 12 ; 9600 Baud bm19200 equ 6 ; 19200 Baud bm38400 equ 3 ; 38400 Baud bm56000 equ 2 ; 56000 Baud ; MPU Serial Channel Baud Rate mpbrate equ bm19200 ; 19,200 Baud ; Quad I/O Ports qbase equ 80h ; Base address of Quad RS-232 I/O Board q0data equ qbase ; USART 0 Data Port (DTE) q0stat equ qbase+1 ; USART 0 Status Port q1data equ qbase+2 ; USART 1 Data Port (DTE) q1stat equ qbase+3 ; USART 1 Status Port q2data equ qbase+4 ; USART 2 Data Port (DTE) q2stat equ qbase+5 ; USART 2 Status Port q3data equ qbase+6 ; USART 3 Data Port (DCE) q3stat equ qbase+7 ; USART 3 Status Port q0baud equ qbase+8 ; USART 0 Baud Rate Port q1baud equ qbase+9 ; USART 1 Baud Rate Port q2baud equ qbase+10 ; USART 2 Baud Rate Port q3baud equ qbase+11 ; USART 3 Baud Rate Port ; Quad I/O RDA and TBE qrda equ 2 ; Read Data Available Bit (RDA) qtbe equ 1 ; Transmit Buffer Empty Bit (TBE) ************************************* * Equate Values for PMMI as Modem * ************************************* * Modem Ports (Special -- 300 or 600 Baud for PMMI) *mods equ 0E0H ; Modem Status Byte *modd equ 0E1H ; Modem Data Byte * * Modem RDA and TBE *mrda equ 2 ; Read Data Available Bit (RDA) *mtbe equ 1 ; Transmit Buffer Empty Bit (TBE) ************************************* ; Modem Ports set to QUAD I/O Port 2 mods equ q2stat ; Modem Status Port modd equ q2data ; Modem Data Port ; Modem RDA and TBE mrda equ qrda mtbe equ qtbe ; Baud Rate Values b00050 equ 0 ; 50 Baud b00075 equ 1 ; 75 Baud b00110 equ 2 ; 110 Baud b00134 equ 3 ; 134.5 Baud b00150 equ 4 ; 150 Baud b00300 equ 5 ; 300 Baud b00600 equ 6 ; 600 Baud b01200 equ 7 ; 1200 Baud b01800 equ 8 ; 1800 Baud b02000 equ 9 ; 2000 Baud b02400 equ 10 ; 2400 Baud b03600 equ 11 ; 3600 Baud b04800 equ 12 ; 4800 Baud b07200 equ 13 ; 7200 Baud b09600 equ 14 ; 9600 Baud b19200 equ 15 ; 19200 Baud ***************************************************************** * * * Baud Rates for Quad I/O Devices * * * ***************************************************************** q0brate equ b09600 ; 9600 Baud for Intersystem q1brate equ b01200 ; 1200 Baud for Clock q2brate equ b00300 ; 300 Baud for Smartmodem q3brate equ b00300 ; 300 Baud for Printer ***************************************************************** * * * Miscellaneous Constants * * * ***************************************************************** XON equ 11h ;X-ON XOFF equ 13h ;X-OFF djram equ 0e400h ;Base of DJ RAM djcin equ djram+3 ;DJ Console Input djcout equ djram+6 ;DJ Console Output ***************************************************************** * * * The following are the Z80 Macro Definitions which are used to * * define the Z80 Mnemonics used to implement the Z80 instruction* * set extensions employed in CBIOSZ. * * * ***************************************************************** ; ; MACROS TO PROVIDE Z80 EXTENSIONS ; MACROS INCLUDE: ; $-MACRO ;FIRST TURN OFF THE EXPANSIONS ; ; JR - JUMP RELATIVE ; JRC - JUMP RELATIVE IF CARRY ; JRNC - JUMP RELATIVE IF NO CARRY ; JRZ - JUMP RELATIVE IF ZERO ; JRNZ - JUMP RELATIVE IF NO ZERO ; DJNZ - DECREMENT B AND JUMP RELATIVE IF NO ZERO ; LDIR - MOV @HL TO @DE FOR COUNT IN BC ; LXXD - LOAD DOUBLE REG DIRECT ; SXXD - STORE DOUBLE REG DIRECT ; ; ; ; @GENDD MACRO USED FOR CHECKING AND GENERATING ; 8-BIT JUMP RELATIVE DISPLACEMENTS ; @GENDD MACRO ?DD ;;USED FOR CHECKING RANGE OF 8-BIT DISPLACEMENTS IF (?DD GT 7FH) AND (?DD LT 0FF80H) DB 100H ;Displacement Range Error on Jump Relative ELSE DB ?DD ENDIF ENDM ; ; Z80 MACRO EXTENSIONS ; JR MACRO ?N DB 18H @GENDD ?N-$-1 ENDM ; JRC MACRO ?N DB 38H @GENDD ?N-$-1 ENDM ; JRNC MACRO ?N DB 30H @GENDD ?N-$-1 ENDM ; JRZ MACRO ?N DB 28H @GENDD ?N-$-1 ENDM ; JRNZ MACRO ?N DB 20H @GENDD ?N-$-1 ENDM ; DJNZ MACRO ?N DB 10H @GENDD ?N-$-1 ENDM ; LDIR MACRO DB 0EDH,0B0H ENDM ; LDED MACRO ?N DB 0EDH,05BH DW ?N ENDM ; LBCD MACRO ?N DB 0EDH,4BH DW ?N ENDM ; SDED MACRO ?N DB 0EDH,53H DW ?N ENDM ; SBCD MACRO ?N DB 0EDH,43H DW ?N ENDM ; ; END OF Z80 MACRO EXTENSIONS ; ***************************************************************** * * * Terminal driver routines. Iobyte is initialized by the cold * * boot routine, to modify, change the "intioby" equate. The * * I/O routines that follow all work exactly the same way. Using * * iobyte, they obtain the address to jump to in order to execute* * the desired function. There is a table with four entries for * * each of the possible assignments for each device. To modify * * the I/O routines for a different I/O configuration, just * * change the entries in the tables. * * * ***************************************************************** org iobase ;Base Address of I/O Drivers offset equ 100h-iobase ;Offset for load via DDT or ZSID jmp status ;Internal Status Routine jmp select ;Device Select Routine jmp namer ;Device Name Routine jmp tinit ;Initialize Terminal jmp const ;Console Input Status jmp conin ;Console Input Char jmp conout ;Console Output Char jmp list ;List Output Char jmp punch ;Punch Output Char jmp reader ;Reader Input Char jmp listst ;List Output Status jmp newio ;New I/O Driver Installation Routine jmp copen ;Open CON: Disk File jmp cclose ;Close CON: Disk File jmp lopen ;Open LST: Disk File jmp lclose ;Close LST: Disk File ***************************************************************** * * * status: return information on devices supported by this * * I/O Package. On exit, HL points to a logical device * * table which is structured as follows: * * Device Count Byte Current Assignment Byte * * ------ ---------- ----------------------- * * CON: 0 1 * * RDR: 2 3 * * PUN: 4 5 * * LST: 6 7 * * * * If error or no I/O support, return with Zero Flag Set. * * Also, if no error, A=Driver Module Number * * * ***************************************************************** status: lxi h,cnttbl ;point to table mvi a,01H ;Module 1 (SYSIO) with no Disk Output ora a ;Set Flags ret ***************************************************************** * * * select: select devices indicated by B and C. B is the number * * of the logical device, where CON:=0, RDR:=1, PUN:=2, * * LST:=3, and C is the desired device (range 0 to dev-1). * * Return with Zero Flag Set if Error. * * * ***************************************************************** ranger: lxi h,cnttbl-2 ;check for error inr b ;range of 1 to 4 mov a,b ;Value in A cpi 5 ;B out of range? jnc rangerr push b ;save params rang: inx h ;pt to next inx h djnz rang mov b,m ;get count in b mov a,c ;get selected device number cmp b ;compare (C must be less than B) pop b ;get params jrnc rangerr ;range error if C >= B rangok: mvi a,0ffh ;OK ora a ;set flags ret rangerr: xra a ;not OK ret select: call ranger ;check for range error rz ;abort if error inx h ;pt to current entry number mov m,c ;save selected number there lxi h,cfgtbl-2 ;pt to configuration table sel2: inx h ;Pt to Entry in Configuration Table inx h djnz sel2 mov b,m ;Get Rotate Count inx h ;Pt to Select Mask mov d,m ;Get Select Mask mov a,b ;Any Rotation to do? ora a jz sel4 mov a,c ;Get Selected Number sel3: rlc ;Rotate Left 1 Bit djnz sel3 mov c,a ;Place Bit Pattern Back in C sel4: lda iobyte ;get I/O byte ana d ;mask out old selection ora c ;mask in new selection sta iobyte ;put I/O byte jr rangok ;range OK ***************************************************************** * * * namer: return text string of physical device. Logical device * * number is in B and physical selection is in C. * * HL is returned pointing to the first character of the * * string. The strings are structured to begin with a * * device name followed by a space and then a description * * string which is terminated by a binary 0. * * * * Return with Zero Flag Set if error. * * * ***************************************************************** namer: call ranger ;check for range error rz ;return if so lxi h,namptbl-2 ;pt to name ptr table call namsel ;select ptr table entry mov b,c ;physical selection number in B now inr b ;Add 1 for Initial Increment call namsel ;point to string jr rangok ;return with HL pointing and range OK ; ; Select entry B in table pted to by HL; this entry is itself a pointer, ; and return with it in HL ; namsel: inx h ;pt to next entry inx h djnz namsel mov a,m ;get low inx h mov h,m ;get high mov l,a ;HL now points to entry ret ***************************************************************** * * * const: get the status for the currently assigned console. * * The I/O Byte is used to select the device. * * * ***************************************************************** const: lxi h,cstble ;Beginning of jump table conmask: lxi d,cfgtbl ;Pt to First Entry in Config Table jr seldev ;Select correct jump ***************************************************************** * * * conin: input a character from the currently assigned console. * * The I/O Byte is used to select the device. * * * ***************************************************************** conin: lxi h,citble ;Beginning of character input table jr conmask ;Get Console Mask ***************************************************************** * * * conout: output the character in C to the currently assigned * * console. The I/O Byte is used to select the device. * * * ***************************************************************** conout: lxi h,cotble ;Beginning of the character out table jr conmask ;Get Console Mask ***************************************************************** * * * csreader: get the status of the currently assigned reader. * * The I/O Byte is used to select the device. * * * ***************************************************************** csreadr: lxi h,csrtble ;Beginning of reader status table rdrmask: lxi d,cfgtbl+2 ;Pt to 2nd Entry in Config Table jr seldev ***************************************************************** * * * reader: input a character from the currently assigned reader. * * The I/O Byte is used to select the device. * * * ***************************************************************** reader: lxi h,rtble ;Beginning of reader input table jr rdrmask ;Get the Mask and Go ***************************************************************** * * * Entry at seldev will form an offset into the table pointed * * to by H&L and then pick up the address and jump there. * * The configuration of the physical device assignments is * * pointed to by D&E (cfgtbl entry). * * * ***************************************************************** seldev: push b ;Save Possible Char in C ldax d ;Get Rotate Count mov b,a ;... in B inx d ;Pt to Mask ldax d ;Get Mask cma ;Flip Bits mov c,a ;... in C lda iobyte ;Get I/O Byte ana c ;Mask Out Selection inr b ;Increment Rotate Count seld1: dcr b ;Count down jrz seld2 rrc ;Rotate Right one Bit jr seld1 seld2: rlc ;Double Number for Table Offset mvi d,0 ;Form offset mov e,a dad d ;Add offset mov a,m ;Pick up low byte inx h mov h,m ;Pick up high byte mov l,a ;Form address pop b ;Get Possible Char in C pchl ;Go there ! ***************************************************************** * * * punch: output char in C to the currently assigned punch * * device. The I/O Byte is used to select the device. * * * ***************************************************************** punch: lxi h,ptble ;Beginning of punch table lxi d,cfgtbl+4 ;Get Mask jr seldev ;Select Device and Go ***************************************************************** * * * list: output char in C to the currently assigned list device. * * The I/O Byte is used to select the device. * * * ***************************************************************** list: lxi h,ltble ;Beginning of the list device routines lstmask: lxi d,cfgtbl+6 ;Get Mask jr seldev ;Select Device and Go ***************************************************************** * * * Listst: get the output status of the currently assigned list * * device. The I/O Byte is used to select the device. * * * ***************************************************************** listst: lxi h,lstble ;Beginning of the list device status jr lstmask ;Mask and Go ***************************************************************** * * * If customizing I/O routines is being performed, the tables * * below should be modified to reflect the changes. All I/O * * devices are decoded out of iobyte and the jump is taken from * * the following tables. * * * ***************************************************************** ***************************************************************** * * * I/O Driver Support Specification Tables * * * ***************************************************************** * * Device Counts * First Byte is Number of Devices, 2nd Byte is Selected Device * cnttbl: db 6,(intioby AND 7) ;CON: db 2,(intioby AND 08h) SHR 3 ;RDR: db 2,(intioby AND 10h) SHR 4 ;PUN: db 4,(intioby AND 0E0h) SHR 5 ;LST: * * Configuration Table * First Byte is Rotate Count, 2nd Byte is Mask * cfgtbl: db 0,111$1$1$000b ;No Rotate, Mask Out 3 LSB db 3,111$1$0$111b ;3 Rotates, Mask Out Bit 3 db 4,111$0$1$111b ;4 Rotates, Mask Out Bit 4 db 5,000$1$1$111b ;5 Rotates, Mask Out 3 MSB * * name text tables * namptbl: dw conname-2 ;CON: dw rdrname-2 ;RDR: dw punname-2 ;PUN: dw lstname-2 ;LST: conname: dw namtty ;TTY dw namcrt ;CRT dw namusr ;CRT and Modem in Parallel dw namusr1 ;CRT Input and CRT/Remote Computer Output dw namusr2 ;CRT Input and CRT/Modem Output dw namcrtp ;CRT Input and CRT/Printer Output lstname: dw namtty ;TTY dw namcrt ;CRT dw namrem ;Remote Computer dw nammod ;Modem rdrname: dw nammod ;Modem dw namclk ;Clock punname: dw nammod ;Modem dw namclk ;Clock namtty: db 'TTY Model 43 Printing Terminal',0 namcrt: db 'CRT Televideo 950 CRT',0 namcrtp: db 'CRTPRT CRT Input and CRT/Printer Output',0 namusr: db 'CRTMOD Televideo 950 CRT and Modem in Parallel',0 namusr1: db 'CRTREM Televideo 950 CRT Input and CRT/Remote Output',0 namusr2: db 'CRTMOD2 Televideo 950 CRT Input and CRT/Modem Output',0 namrem: db 'REMOTE Remote Computer',0 nammod: db 'MODEM DC Hayes Smartmodem',0 namclk: db 'CLOCK DC Hayes Chronograph',0 * * console input table * citble: dw citty ;Input from tty (000) dw cicrt ;Input from crt (001) dw ciusr ;Input from crt and modem (010) dw cicrt ;Input from crt (011) dw cicrt ;Input from crt (100) dw cicrt ;Input from crt (101) * * console output table * cotble: dw cotty ;Output to tty (000) dw cocrt ;Output to crt (001) dw cousr ;Output to crt and modem (010) dw cousr1 ;Output to crt and remote system (011) dw cousr ;Output to crt and modem (100) dw cocrtp ;Output to crt and printer (101) * * list device table * ltble: dw cotty ;Output to tty (000) dw cocrt ;Output to crt (001) dw corem ;Output to remote system (010) dw comod ;Output to modem (011) * * punch device table * ptble: dw comod ;Output to modem (0) dw coclk ;Output to clock (1) * * reader device table * rtble: dw cimod ;Input from modem (0) dw ciclk ;Input from clock (1) * * console status table * cstble: dw cstty ;Status of tty (000) dw cscrt ;Status from crt (001) dw csusr ;Status from crt and modem (010) dw cscrt ;Status from crt (011) dw cscrt ;Status from crt (100) dw cscrt ;Status from crt (101) * * status from reader device * csrtble: dw csmod ;Status from modem (0) dw csclk ;Status from clock (1) * * Status from list device * lstble: dw costty ;Status from tty (000) dw coscrt ;Status from crt (001) dw cosrem ;Status from remote system (010) dw cosmod ;Status from modem (011) ***************************************************************** * * * Tinit can be modified for different I/O setups. * * * ***************************************************************** tinit: ;Initialize the terminal routine ; Initialize I/O Byte mvi a,intioby ;Initialize IOBYTE sta iobyte ; Initialize MPU Serial I/O Channel Characteristics and Baud Rate mvi a,10$00$00$11b ;Access Divisor: ; 10 -- Set divisor latch, clear break ; 00 -- 0 parity bit, even parity (N/A) ; 00 -- disable parity, 1 stop bit ; 11 -- 8 Data Bits out mpulcr ;To Line Control Register lxi h,mpbrate ;HL = MPU Channel Baud Rate mov a,l ;Set Low-Byte of Baud Rate out mpudll ;To Divisor Latch Low mov a,h ;Set High-Byte of Baud Rate out mpudlh ;To Divisor Latch High mvi a,00$00$01$11b ;Reset Divisor Access and Set Characteristics: ; 00 -- Clear divisor latch, clear break ; 00 -- 0 parity bit, even parity (N/A) ; 01 -- disable parity, 2 stop bits ; 11 -- 8 Data Bits out mpulcr ;To Line Control Register xra a ;A=0 out mpuier ;Disable All Interrupts in Interrupt Register out mpustat ;Clear All Error Flags in Line Status Register mvi a,0000$1111b ;3 Zeroes, No Loop, 1, Set RLSD, CTS, DSR out mpupcr ;To Peripheral Control Register ; Initialize Quad I/O Channel Characteristics mvi a,10$11$01$11b ;General-Purpose Reset: ; 10 -- 1 1/2 Stop Bits ; 11 -- Even Parity, Enable Parity ; 01 -- 6 Bits/Char ; 11 -- 64x Baud Rate call setquad ;Set All 4 Quad I/O Ports mvi a,01$11$01$11b ;General-Purpose Reset: ; 01 -- Disable Hunt, Internal Reset ; 11 -- RTS High, Error Reset ; 01 -- No Break, Enable RxRDY ; 11 -- NOT DTR High, Enable TxEN call setquad ;Set All 4 Quad I/O Ports mvi a,11$00$11$10b ;Characteristics Set for All: ; 11 -- 2 Stop Bits ; 00 -- No Parity ; 11 -- 8 Bits/Char ; 10 -- 16x Baud Rate call setquad ;Set All 4 Quad I/O Ports mvi a,00$11$01$11b ;Characteristics Set for All: ; 00 -- Disable Hunt, No Internal Reset ; 11 -- RTS High, Error Reset ; 01 -- No Break, Enable RxRDY ; 11 -- NOT DTR High, Enable TxEN call setquad ;Set All 4 Quad I/O Ports ; Initialize Quad I/O Baud Rates mvi a,q0brate ;Set USART 0 Baud Rate out q0baud mvi a,q1brate ;Set USART 1 Baud Rate out q1baud mvi a,q2brate ;Set USART 2 Baud Rate out q2baud mvi a,q3brate ;Set USART 3 Baud Rate out q3baud ; Clear Garbage Char from CRT call cscrt ;Gobble up unwanted char ora a ;A=0 if none cnz cicrt ;Grab character ret ; Set All Quad I/O Control Ports setquad: out q0stat ;USART 0 out q1stat ;USART 1 out q2stat ;USART 2 out q3stat ;USART 3 xthl ;Long Delay xthl ret ***************************************************************** * * * NEWIO -- Set UC1: Device to the Device Drivers whose Jump * * Table is Pointed to by HL * * * * This Jump Table is structured as follows: * * JMP ISTAT <-- Input Status (0=No Char, 0FFH=Char) * * JMP INPUT <-- Input Character * * JMP OUTPUT <-- Output Character in C * * * * The Base Address of this Jump Table (JBASE) is passed to * * NEWIO in the HL Register Pair. * * * ***************************************************************** newio: shld cstble+6 ;Set UC1: Input Status lxi d,3 ;Prepare for offset to next jump dad d ;HL points to next jump shld citble+6 ;Set UC1: Input Character dad d ;HL points to next jump shld cotble+6 ;Set UC1: Output Character ret ***************************************************************** * * * Input Status, Input Character, and Output Character * * Subroutines for CP/M * * * ***************************************************************** * * * Input Status -- * * These routines return 0 in the A Register if no input * * data is available, 0FFH if input data is available. * * * * Input Character -- * * These routines return the character (byte) in the A * * Register. MSB is masked off. * * * * Output Character -- * * These routines output the character (byte) in the C * * Register. * * * ***************************************************************** ***************************************************************** * * * CRT Input Status, Input Character, and Output Character * * * ***************************************************************** cscrt equ $ ;CRT Input Status lda ustat ;Get Status cma ;Inverted Logic ani istat ;Mask for input status and fall thru to 'STAT' jr stat ;Set Flags coscrt equ $ ;CRT Output Status lda ustat ;Get USART status cma ;Inverted Logic ani ostat ;Mask for output status jr stat ;Return cicrt equ $ ;CRT Input jmp djcin ;Get char cocrt equ $ ;CRT Output jmp djcout ;Put char cocrtp equ $ ;CRT and Printer Output push b ;Save char call djcout ;CRT Output pop b ;Get char jmp cotty ;Printer Output ***************************************************************** * * * Modem Input Status, Input Character, and Output Character * * * ***************************************************************** csmod equ $ ;Modem Input Status in mods ani mrda ;Data available? jr stat cosmod equ $ ;Modem Output Status in mods ;Get status ani mtbe ;TBE? jr stat cimod equ $ ;Modem Input Character call csmod ;RDA? jrz cimod in modd ;Get data ani 7fh ;Mask ret comod equ $ ;Modem Output call cosmod ;TBE? jrz comod mov a,c ;Get char out modd ;Put data ret ***************************************************************** * * * Clock Input Status, Input Character, and Output Character * * * ***************************************************************** csclk equ $ ;TTY Input Status in q1stat ;Get Status ani qrda ;Data available? jr stat cosclk equ $ ;TTY Output Status in q1stat ;Get Status ani qtbe ;TBE? jr stat ciclk equ $ ;TTY Input Character call csclk ;RDA? jrz ciclk in q1data ;Get data ani 7fh ;Mask ret coclk equ $ ;TTY Output Character call cosclk ;TBE? jrz coclk mov a,c ;Get data out q1data ;Put data ret ***************************************************************** * * * This is a common return point to correctly set the return * * status flags; it is centrally located for the jump * * relative instructions * * * ***************************************************************** stat: rz ;Nothing found ready: mvi a,0ffh ;Set A for negative status ret ***************************************************************** * * * TTY Input Status, Input Character, and Output Character * * * ***************************************************************** cstty equ $ ;TTY Input Status in q3stat ;Get Status ani qrda ;Data available? jr stat costty equ $ ;TTY Output Status in q3stat ;Get Status ani qtbe ;TBE? jr stat citty equ $ ;TTY Input Character call cstty ;RDA? jrz citty in q3data ;Get data ani 7fh ;Mask ret cotty equ $ ;TTY Output Character call costty ;TBE? jrz cotty mov a,c ;Get data out q3data ;Put data ret ***************************************************************** * * * Remote System Input Status, Input Character, and Output * * Character * * * ***************************************************************** csrem equ $ ;TTY Input Status in q0stat ;Get Status ani qrda ;Data available? jr stat cosrem equ $ ;TTY Output Status in q0stat ;Get Status ani qtbe ;TBE? jr stat cirem equ $ ;TTY Input Character call csrem ;RDA? jrz cirem in q0data ;Get data ani 7fh ;Mask ret corem equ $ ;TTY Output Character call coxoff ;Check for XOFF and process call cosrem ;TBE? jrz corem mov a,c ;Get data out q0data ;Put data ret coxoff equ $ ;Remote XOFF Check and Processing call csrem ;Input Char from LST: Device? rz ;Zero if none call cirem ;Get Char cpi XOFF ;XOFF? rnz ;Return if not call cirem ;Wait for Any Other Char ret ***************************************************************** * * * User-Defined (CRT and Modem) Input Status, Input Character, * * and Output Character * * * ***************************************************************** csusr equ $ ;User (CRT and Modem) Input Status call cscrt ;Input from CRT? rnz ;Char found call csmod ;Input from Modem? ret cosusr equ cosmod ;Output status same as modem since modem is slower ciusr equ $ ;Modem/CRT Input Combination call cscrt ;Input from CRT? jnz cicrt ;Get char from CRT call csmod ;Input from Modem? jnz cimod ;Get char from Modem jr ciusr ;Continue cousr equ $ ;Modem/CRT Output Combination call comod ;Output to Modem jmp cocrt ;Output to CRT ciusr1 equ $ ;Modem/CRT Input w/CRT Output Combination call ciusr ;Get char push psw ;Save char in A mov c,a ;Char in C call cocrt ;Output to CRT pop psw ;Restore char in A ret cousr1 equ $ ;Remote System/CRT Output Combination call corem ;Output to Remote System jmp cocrt ;Output to CRT ; ; COPEN -- Open Console File for Output ; LOPEN -- Open Printer File for Output ; ; Do Nothing Since Not Supported ; copen: lopen: ret ; ; Close Disk Files ; CCLOSE -- CON file (DSK1) ; LCLOSE -- LST file (DSK2) ; ; Do Nothing Since Not Supported ; cclose: lclose: ret ; ; End Message ; db 'End of SYSIO',0 end