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Assembly Source File | 1984-04-29 | 16.7 KB | 534 lines

; LINK - SUPPORT COMMUNICATIONS LINK WITH CYBER ; ; L.E. HUGHES EDCAM JULY, 1977 ; BDOS ENTRY POINT AND FUNCTION CODES BDOS EQU 0005H OFFC EQU 15 ;OPEN FILE CFFC EQU 16 ;CLOSE FILE DFFC EQU 19 ;DELETE FILE RRFC EQU 20 ;READ RECORD WRFC EQU 21 ;WRITE RECORD MFFC EQU 22 ;MAKE FILE ; DEFAULT FCB AND FIELD DEFINITIONS FCB EQU 5CH FN EQU 1 ;FILE NAME FIELD (REL) FT EQU 9 ;FILE TYPE FIELD (REL) NR EQU 32 ;NEXT RECORD FIELD (REL) DBUF EQU 80H ;DEFAULT DISK BUFFER ADDRESS ; ASCII CONTROL CHARACTERS LF EQU 012Q ;LINE FEED CR EQU 015Q ;CARRIAGE RETURN DEL EQU 177Q ;DELETE ; I/O PORT ADDRESSES COND EQU 012H ;CONSOLE DATA PORT CONS EQU 013H ;CONSOLE STATUS PORT MODD EQU 014H ;MODEM DATA PORT MODS EQU 015H ;MODEM STATUS PORT CONT EQU 018H ;SIO CONTROL PORT FOR MODEM ; STATUS PORT BIT DEFINITIONS TBE EQU 001Q ;TRANSMIT BUFFER READY FOR ANOTHER BYTE RDA EQU 002Q ;READ DATA AVAILABLE ; MAIN PROGRAM ORG 100H LINK: LXI H,0 ;SAVE OLD STACK POINTER DAD SP SHLD OLDSP LXI SP,STACK+64 ;CREATE LOCAL STACK LINKM: IN CONT ;CHECK CTS TO SEE IF NEED INTERNAL RESET ANI 080H ;CTS INVERTED AT THIS PORT JZ LINKC ;DONOT NEED RESET LXI H,APPS ;INITIALIZE PORTS MVI B,5 LINK1: MOV A,M INX H OUT MODS DCR B JNZ LINK1 IN MODD IN MODD MVI A,047Q ;SEND MODEM RTS AND DTR OUT MODS ; AND ENABLE RECEIVER AND TRANSMITTER LINKC: LXI H,APPS ;INITIALIZE PORTS MVI B,5 LINKD: MOV A,M INX H OUT CONS DCR B JNZ LINKD IN COND ;CLEAR USART READ BUFFERS IN COND MVI A,047Q ;SEND CONSOLE CTS AND DSR, OUT CONS ; AND ENABLE RECEIVER AND TRANSMITTER LINK2: XRA A ;CLEAR CHAR BUFFERS STA INCH STA OUTCH STA FLAG ;CLEAR TEXT SAVE FLAG LXI H,TBUF ;SET PTR TO TBUF SHLD PTR LXI H,0 ;SIZE = 0 SHLD SIZE CALL WCCR ;WRITE CR/LF TO CONSOLE MVI A,7 ;RING BELL ON CONSOLE, TO LET CALL WCC ; CLONE KNOW WE'RE READY ; MAIN LOOP LINK3: IN CONS ;JUMP IF NO DATA FROM CONSOLE ANI RDA JZ LINK4 IN COND ;ELSE READ CONSOLE DATA ANI 177Q ;CALL PCC IF CONTROL CHAR CPI 40Q CC PCC JC LINK4 ;JUMP IF PCC HANDLED CHAR ORI 200Q ;ELSE SET VALID DATA BIT STA INCH ;AND STORE IN INPUT CHAR BUFFER LINK4: IN CONS ;JUMP IF CONSOLE XMIT BUFFER BUSY ANI TBE JZ LINK5 LDA OUTCH ;JUMP IF NO DATA FOR CONSOLE ORA A JP LINK5 ANI 177Q ;ELSE DISCARD VALID DATA BIT OUT COND ; AND OUTPUT CHAR TO CONSOLE XRA A ; THEN CLEAR OUTPUT CHAR BUFFER STA OUTCH LINK5: IN MODS ;JUMP IF NO DATA FROM MODEM ANI RDA JZ LINK6 IN MODD ;ELSE READ MODEM DATA ANI 177Q ;DISCARD PARITY BIT CALL SAVE ;SAVE CHAR IN TEXT BUFFER IF FLAG ON ORI 200Q ;SET DATA VALID BIT STA OUTCH ;STORE IN OUTPUT CHAR BUFFER LINK6: IN MODS ;JUMP IF MODEM XMIT BUFFER BUSY ANI TBE JZ LINK7 LDA INCH ;JUMP IF NO DATA FOR MODEM ORA A JP LINK7 ANI 177Q ;ELSE DISCARD VALID DATA BIT OUT MODD ; AND OUTPUT CHAR TO MODEM XRA A ; THEN CLEAR INPUT CHAR BUFFER STA INCH LINK7: JMP LINK3 ;END OF MAIN LOOP ; PCC - PROCESS CONTROL CHARACTER PCC: CPI 'X'-100Q ;JUMP IF NOT CONTROL-X JNZ PCC1 LHLD OLDSP ;ELSE CLEAN UP ACT AND GO HOME SPHL RET PCC1: CPI 'S'-100Q ;JUMP IF NOT CONTROL-S JNZ PCC2 CALL STF ;SEND TEXT FILE TO MODEM STC ;TELL LINK TO IGNORE THIS CHARACTER RET PCC2: CPI 'R'-100Q ;JUMP IF NOT CONTROL-R JNZ PCC3 MVI A,1 ;TURN ON TEXT SAVE FLAG STA FLAG STC RET PCC3: CPI 'Q'-100Q ;JUMP IF NOT CONTROL-Q JNZ PCC4 XRA A ;TURN OFF TEXT SAVE FLAG STA FLAG CALL WTB ;WRITE TEXT BUFFER TO DISK LXI H,TBUF ;CLEAR TEXT BUFFER SHLD PTR LXI H,0 SHLD SIZE STC RET PCC4: STC ;LET LINK HANDLE ALL OTHER CONTROL CODES CMC RET ; STF - SEND TEXT FILE (TO MODEM) STF: CALL GFN ;GET NAME OF DISK FILE TO SEND JC STF6 ;JUMP IF FILE NAME ERROR CALL OPEN ;TRY TO OPEN SPECIFIED FILE CPI 255 ;JUMP IF FILE NOT FOUND JZ STF7 XRA A ;ELSE REWIND FILE AND GET ON WITH IT STA FCB+NR STF1: CALL READ ;READ NEXT RECORD INTO DBUF CPI 1 ;JUMP IF END-OF-FILE JZ STF5 LXI H,DBUF ;POINT TO DISK BUFFER MVI C,128 STF2: MOV A,M ;FETCH NEXT CHAR FROM DBUF INX H CPI 'Z'-100Q ;JUMP IF END-OF-FILE CHARACTER JZ STF5 CPI LF ;IGNORE LINE FEEDS JZ STF4 CALL WMC ;WRITE CHARACTER TO MODEM CALL WCC ;WRITE CHARACTER TO CONSOLE CPI CR ;JUMP IF NOT CARRIAGE RETURN JNZ STF4 STF3: CALL RMC ;AWAIT LINE FEED FROM MODEM CPI LF JNZ STF3 CALL WCC ;ECHO LINE FEED TO CONSOLE STF4: DCR C ;LOOP THRU REST OF DBUF JNZ STF2 JMP STF1 ;GO GET NEXT RECORD FROM DISK STF5: CALL CLOSE ;CLEAN UP ACT AND GO HOME RET STF6: LXI H,STFS1 ;PRINT 'FILE NAME ERROR' CALL WCS RET STF7: LXI H,STFS2 ;PRINT 'FILE NOT FOUND' CALL WCS RET STFS1: DB 'FILE NAME ERROR',CR,LF,0 STFS2: DB 'FILE NOT FOUND',CR,LF,0 ; SAVE - SAVE CHAR IN TEXT BUFFER IF FLAG ON ; ; ENTRY CONDITIONS ; A - CHARACTER TO SAVE SAVE: PUSH PSW LDA FLAG ORA A JNZ SAVE1 POP PSW RET SAVE1: POP PSW PUSH H LHLD PTR MOV M,A INX H SHLD PTR LHLD SIZE ;SIZE = SIZE + 1 INX H SHLD SIZE POP H RET ; WTB - WRITE TEXT BUFFER TO DISK WTB: LHLD SIZE ;JUMP IF TEXT BUFFER EMPTY MOV A,L ORA H JZ WTB5 CALL GFN ;GET FILE NAME JC WTB6 ;JUMP IF FILE NAME ERROR CALL DELT ;DELETE OLD FILE, IF ANY CALL MAKE ;MAKE NEW FILE XRA A ;REWIND FILE STA FCB+NR LHLD SIZE ;DE = TBUF SIZE XCHG LXI H,DBUF ;TOP OF STACK POINTS TO DBUF PUSH H LXI H,TBUF ;HL POINTS TO TBUF WTB1: MVI C,128 ;DISK BUFFER SIZE WTB2: MOV A,M ;FETCH NEXT BYTE OF TBUF INX H XTHL MOV M,A ;STORE IN DBUF INX H XTHL DCX D ;SIZE = SIZE - 1 MOV A,D ;EXIT LOOP IF SIZE = 0 ORA E JZ WTB3 DCR C ;LOOP UNTIL DBUF FULL JNZ WTB2 CALL WRITE ;WRITE FULL DBUF TO DISK XTHL ;TOP OF STACK POINTS TO DBUF LXI H,DBUF XTHL JMP WTB1 ;LOOP UNTIL END OF TBUF WTB3: POP H ;HL POINTS TO CURRENT PLACE IN DBUF WTB4: MVI M,'Z'-100Q ;STORE EOF CODE INX H DCR C ;LOOP THRU REST OF DBUF JNZ WTB4 CALL WRITE ;WRITE LAST SECTOR TO DISK CALL CLOSE ;CLEAN UP ACT AND GO HOME RET WTB5: LXI H,WTBS1 ;PRINT 'TEXT BUFFER EMPTY' CALL WCS RET WTB6: LXI H,WTBS2 ;PRINT 'FILE NAME ERROR' CALL WCS RET WTBS1: DB 'TEXT BUFFER EMPTY',CR,LF,0 WTBS2: DB 'FILE NAME ERROR',CR,LF,0 ; WCS - WRITE CONSOLE STRING ; ; ENTRY CONDITIONS ; HL - POINTS TO STRING (TERM BY ZERO BYTE) WCS: MOV A,M INX H ORA A RZ CALL WCC JMP WCS ; WCCR - WRITE CONSOLE CARRIAGE RETURN (AND LINE FEED) WCCR: MVI A,CR CALL WCC MVI A,LF ; WCC - WRITE CONSOLE CHARACTER ; ; ENTRY CONDITIONS: ; A - CHARACTER TO WRITE WCC: PUSH PSW IN CONS ANI TBE JZ $-4 POP PSW OUT COND RET ; RCS - READ CONSOLE STRING (WITH ECHO) ; ; EXIT CONDITIONS ; B - NUMBER OF CHARACTERS READ (<255) ; HL - POINTS TO LAST CHAR STORED (CR) RCS: LXI H,IBUF MVI B,0 RCS1: CALL RCC ;READ NEXT CHAR FROM CONSOLE CPI DEL ;JUMP IF NOT DEL JNZ RCS2 INR B ;IGNORE DEL IF IBUF ALREADY EMPTY DCR B JZ RCS1 DCX H ;ELSE DISCARD LAST CHAR MOV A,M ;ECHO DISCARDED CHAR TO CONSOLE CALL WCC DCR B ;DECREMENT COUNT JMP RCS1 ; AND LOOP RCS2: CPI 'U'-100Q ;JUMP IF NOT CONTROL-U JNZ RCS3 CALL WCCR ;ELSE ABORT CURRENT LINE JMP RCS ; AND START OVER RCS3: CALL WCC ;ECHO CHAR TO CONSOLE MOV M,A ;STORE CHAR IN IBUF INR B ;INCREMENT COUNT CPI CR ;JUMP IF CARRIAGE RETURN JZ RCS4 INX H ;ELSE ADVANCE POINTER JMP RCS1 ; AND LOOP RCS4: MVI A,LF ;ISSUE LINE FEED AND RETURN CALL WCC RET ; RCC - READ CONSOLE CHARACTER ; ; EXIT CONDITIONS ; A - CHARACTER READ RCC: IN CONS ANI RDA JZ $-4 IN COND ANI 177Q RET ; WMC - WRITE MODEM CHARACTER ; ; ENTRY CONDITIONS ; A - CHARACTER TO WRITE WMC: PUSH PSW IN MODS ANI TBE JZ $-4 POP PSW OUT MODD RET ; RMC - READ MODEM CHARACTER ; ; EXIT CONDITIONS: ; A - CHARACTER READ RMC: IN MODS ANI RDA JZ $-4 IN MODD ANI 177Q RET ; GFN - GET FILE NAME GFN: CALL WCCR LXI H,GFNS1 ;PRINT 'FILENAME? ' CALL WCS CALL RCS ;READ RESPONSE INTO IBUF LXI H,FCB+FN ;BLANK FILL FN AND FT FIELDS MVI C,11 GFN1: MVI M,' ' INX H DCR C JNZ GFN1 LXI H,IBUF ;POINT TO INPUT BUFFER LXI D,FCB+FN ;SCAN OFF FN FIELD MVI C,9 GFN2: MOV A,M ;FETCH NEXT CHAR FROM IBUF INX H CPI 141Q ;IF LC, CONVERT TO UC JC $+5 SUI 40Q CPI CR ;JUMP IF END OF LINE JZ GFN5 CPI '.' ;JUMP IF END OF NAME JZ GFN3 STAX D ;ELSE STORE CHAR IN FN FIELD INX D DCR C ;LOOP IF 8 OR LESS CHARS SO FAR JNZ GFN2 JMP GFN6 ;ELSE TAKE ERROR EXIT GFN3: LXI D,FCB+FT ;SCAN OFF FT FIELD MVI C,4 GFN4: MOV A,M ;FETCH NEXT CHAR FROM IBUF INX H CPI 141Q ;IF LC, CONVERT TO UC JC $+5 SUI 40Q CPI CR ;JUMP IF END OF LINE JZ GFN5 STAX D ;ELSE STORE CHAR IN FT FIELD INX D DCR C ;LOOP IF 3 OR LESS CHARS SO FAR JNZ GFN4 JMP GFN6 ;ELSE TAKE ERROR EXIT GFN5: STC ;CLEAR ERROR FLAG AND RETURN CMC RET GFN6: STC ;SET ERROR FLAG AND RETURN RET GFNS1: DB 'FILENAME? ',0 ; OPEN - OPEN DISK FILE OPEN: PUSH H PUSH D PUSH B LXI D,FCB MVI C,OFFC CALL BDOS POP B POP D POP H RET ; READ - READ RECORD FROM DISK FILE READ: PUSH H PUSH D PUSH B LXI D,FCB MVI C,RRFC CALL BDOS POP B POP D POP H RET ; CLOSE - CLOSE DISK FILE CLOSE: PUSH H PUSH D PUSH B LXI D,FCB MVI C,CFFC CALL BDOS POP B POP D POP H RET ; DELT - DELETE DISK FILE DELT: PUSH H PUSH D PUSH B LXI D,FCB MVI C,DFFC CALL BDOS POP B POP D POP H RET ; WRITE - WRITE RECORD TO DISK WRITE: PUSH H PUSH D PUSH B LXI D,FCB MVI C,WRFC CALL BDOS POP B POP D POP H RET ; MAKE - MAKE NEW DISK FILE MAKE: PUSH H PUSH D PUSH B LXI D,FCB MVI C,MFFC CALL BDOS POP B POP D POP H RET ; DATA AREA APPS: DB 000Q,000Q,000Q,100Q,156Q INCH: DS 1 ;INPUT CHAR BUFFER (TO CYBER) OUTCH: DS 1 ;OUTPUT CHAR BUFFER (FROM CYBER) OLDSP: DS 2 ;OLD STACK POINTER STACK: DS 64 ;LOCAL STACK IBUF: DS 256 ;INPUT BUFFER ; TEXT BUFFER FLAG: DS 1 ;TEXT SAVE FLAG PTR: DS 2 ;TEXT BUFFER POINTER SIZE: DS 2 ;TEXT BUFFER SIZE TBUF EQU $ ;START OF TEXT BUFFER END LINK