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Assembly Source File | 1984-04-29 | 20KB | 865 lines

; ;XMODEM.ASM V3.2, BY KEITH PETERSEN, W8SDZ ; (revised 9/13/80) ; ;CP/M - CP/M FILE TRANSFER PROGRAM ;BASED ON MODEM.ASM V2.0, BY WARD CHRISTENSEN ;THIS PROGRAM IS INTENDED FOR USE ON REMOTE CP/M ;SYSTEMS WHERE IT IS IMPORTANT THAT THE INITIALIZATION ;OF THE MODEM NOT BE CHANGED, SUCH AS WHEN USING ;THE PMMIBYE PROGRAM. THE BAUD RATE AND NUMBER OF BITS ;REMAINS THE SAME AS WHATEVER WAS SET PREVIOUSLY. ;THERE IS NO DISCONNECT, TERMINAL OR ECHO OPTION. ; ;NOTE: THIS FILE WILL ASSEMBLE, WITHOUT NEED FOR ;EDITING, TO WORK WITH A PMMI MM-103 MODEM. SEE ;EQUATES FOR OTHER OPTIONS INCLUDING SYSTEM CLOCK ;FREQUENCY AND OTHER TYPES OF MODEMS. ; ; Added conditional assembly to prevent filetypes ;'.COM' or '.??#' from being sent to distant end ;and added conditional assembly of test for '.COM' ;filetype on receive as well. See 'NOCOM' below. ; Any filetype ending in '#' will not be sent by ;this program if 'NOCOM' is set to TRUE. ; 9-SEP-80 J.SEYMOUR ; FALSE EQU 0 TRUE EQU NOT FALSE ; STDCPM EQU TRUE ;TRUE, IS STANDARD CP/M ALTCPM EQU FALSE ;TRUE, IS H8 OR TRS-80 CP/M ; IF STDCPM BASE EQU 0 ;CP/M BASE ADDRESS ENDIF ; IF ALTCPM BASE EQU 4200H ;ALTERNATE CP/M BASE ADDRESS ENDIF ; PMMI EQU TRUE ;TRUE, IS PMMI ; DCH EQU FALSE ;TRUE, IS D.C. HAYES ; NOCOM EQU TRUE ;TRUE, NO .COM OR .??# FILES ;SENT OR '.COM' RECEIVED ; IF PMMI MODCTLP EQU 0C0H ;PMMI VALUES MODSNDB EQU 1 ;BIT TO TEST FOR SEND MODSNDR EQU 1 ;VALUE WHEN READY MODRCVB EQU 2 ;BIT TO TEST FOR RECEIVE MODRCVR EQU 2 ;VALUE WHEN READY MODDATP EQU 0C1H ;DATA PORT BAUDRP EQU 0C2H ;BAUD RATE OUTPUT MODCTL2 EQU 0C3H ;SECOND CTL PORT ENDIF ; IF DCH MODCTLP EQU 82H ;D. C. HAYES VALUES MODSNDB EQU 2 ;BIT TO TEST FOR SEND MODSNDR EQU 2 ;VALUE WHEN READY MODRCVB EQU 1 ;BIT TO TEST FOR RECEIVE MODRCVR EQU 1 ;VALUE WHEN READY MODDATP EQU 80H ;DATA PORT MODCTL2 EQU 81H ;SECOND CTL PORT ENDIF ; ;IF YOU ARE USING AN EXTERNAL MODEM (NOT S-100 PLUG-IN) ;CHANGE THESE EQUATES FOR YOUR MODEM PORT REQUIREMENTS ; IF NOT PMMI AND NOT DCH MODCTLP EQU 02H ;PUT YOUR MODEM CONTROL PORT HERE MODSNDB EQU 80H ;YOUR BIT TO TEST FOR SEND MODSNDR EQU 80H ;YOUR VALUE WHEN READY MODRCVB EQU 40H ;YOUR BIT TO TEST FOR RECEIVE MODRCVR EQU 40H ;YOUR VALUE WHEN READY MODDATP EQU 03H ;YOUR MODEM DATA PORT ENDIF ;END OF EXTERNAL MODEM EQUATES ; ERRLIM EQU 10 ;MAX ALLOWABLE ERRORS ; FASTCLK EQU FALSE ;PUT TRUE HERE FOR 4 MHZ CLOCK ; ;DEFINE ASCII CHARACTERS USED ; SOH EQU 1 ;START OF HEADER EOT EQU 4 ;END OF TRANSMISSION ACK EQU 6 ;ACKNOWLEDGE NAK EQU 15H ;NEG ACKNOWLEDGE CAN EQU 18H ;CONTROL-X FOR CANCEL LF EQU 10 ;LINEFEED CR EQU 13 ;CARRIAGE RETURN ; ORG BASE+100H ; ;INIT PRIVATE STACK LXI H,0 ;HL=0 DAD SP ;HL=STACK FROM CP/M SHLD STACK ;..SAVE IT LXI SP,STACK ;SP=MY STACK CALL ILPRT ;PRINT: DB CR,LF DB 'XMODEM ver 3.2',CR,LF,0 ; ;GET OPTION ; LDA FCB+1 ;GET OPTION (S or R) PUSH PSW ;SAVE OPTION ; ;MOVE THE FILENAME FROM FCB 2 TO FCB 1 ; CALL MOVEFCB ; ;GOBBLE UP GARBAGE CHARS FROM THE LINE ;PRIOR TO RECEIVE OR SEND ; IN MODDATP IN MODDATP ; ;JMP TO APPROPRIATE FUNCTION ; POP PSW ;GET OPTION ; CPI 'S' ;SEND.. JZ SENDFIL ;..A FILE? ; CPI 'R' ;RECEIVE.. JZ RCVFIL ;..A FILE? ; ;INVALID OPTION CALL ERXIT ;EXIT W/ERROR DB '++INVALID OPTION ON XMODEM ' DB 'COMMAND++',CR,LF DB 'Must be S for SEND or R for ' DB 'RECEIVE',CR,LF,'$' ; * * * * * * * * * * * * * * * * * * * * * * * * SENDFIL: SENDS A CP/M FILE * * * * * * * * * * * * * * * * * * * * * * * * ; ;THE CP/M FILE SPECIFIED IN THE MODEM COMMAND ;IS TRANSFERRED OVER THE PHONE TO ANOTHER ;COMPUTER RUNNING MODEM WITH THE "R" (RECEIVE) ;OPTION. THE DATA IS SENT ONE SECTOR AT A ;TIME WITH HEADERS AND CHECKSUMS, AND RE- ;TRANSMISSION ON ERRORS. ; ; SENDFIL CALL OPENFIL ;OPEN THE FILE MVI E,80 ;WAIT 80 SEC.. CALL WAITNAK ;..FOR INITIAL NAK SENDLP CALL RDSECT ;READ A SECTOR JC SENDEOF ;SEND EOF IF DONE CALL INCRSNO ;BUMP SECTOR # XRA A ;ZERO ERROR.. STA ERRCT ;..COUNT SENDRPT CALL SENDHDR ;SEND A HEADER CALL SENDSEC ;SEND DATA SECTOR CALL SENDCKS ;SEND CKSUM CALL GETACK ;GET THE ACK JC SENDRPT ;REPEAT IF NO ACK JMP SENDLP ;LOOP UNTIL EOF ; ;FILE SENT, SEND EOT'S ; SENDEOF MVI A,EOT ;SEND.. CALL SEND ;..AN EOT CALL GETACK ;GET THE ACK JC SENDEOF ;LOOP IF NO ACK JMP EXIT ;ALL DONE ; * * * * * * * * * * * * * * * * * * * * * * * * RCVFIL: RECEIVE A FILE * * * * * * * * * * * * * * * * * * * * * * * * ; ;RECEIVES A FILE IN BLOCK FORMAT AS SENT ;BY ANOTHER PERSON DOING "MODEM S FN.FT". ; RCVFIL EQU $ ; IF NOCOM LXI H,FCB+9 ;POINT TO FILETYPE MVI A,'C' ;1ST LETTER CMP M ;IS IT C ? JNZ CONTINU ;IF NOT, CONTINUE NORMALLY INX H ;GET 2ND LETTER MVI A,'O' ;2ND LETTER CMP M ;IS IT O ? JNZ CONTINU ;IF NOT, CONTINUE NORMALLY INX H ;GET 3RD LETTER MVI A,'M' ;3RD LETTER CMP M ;IS IT M ? JNZ CONTINU ;IF NOT, CONTINUE NORMALLY CALL ERXIT ;EXIT, PRINT ERROR MESSAGE DB '++CAN''T RECEIVE A .COM FILE++' DB CR,LF,CR,LF DB 'Rename filetype ".OBJ" and try again' DB CR,LF,'$' ENDIF ; CONTINU CALL CHEKFIL ;SEE IF FILE EXISTS CALL MAKEFIL ;..THEN MAKE NEW CALL ILPRT ;PRINT: DB 'FILE OPEN, READY TO RECEIVE',CR,LF,0 ; RCVLP CALL RCVSECT ;GET A SECTOR JC RCVEOT ;GOT EOT CALL WRSECT ;WRITE THE SECTOR CALL INCRSNO ;BUMP SECTOR # CALL SENDACK ;ACK THE SECTOR JMP RCVLP ;LOOP UNTIL EOF ; ;GOT EOT ON SECTOR - FLUSH BUFFERS, END ; RCVEOT CALL WRBLOCK ;WRITE THE LAST BLOCK CALL SENDACK ;ACK THE SECTOR CALL CLOSFIL ;CLOSE THE FILE JMP EXIT ;ALL DONE ; * * * * * * * * * * * * * * * * * * * * * * * * SUBROUTINES * * * * * * * * * * * * * * * * * * * * * * * * ; ; ;----> RCVSECT: RECEIVE A SECTOR ; ;RETURNS WITH CARRY SET IF EOT RECEIVED. ; RCVSECT XRA A ;GET 0 STA ERRCT ;INIT ERROR COUNT ; RCVRPT MVI B,10 ;10 SEC TIMEOUT CALL RECV ;GET SOH/EOT JC RCVSTOT ;TIMEOUT CPI SOH ;GET SOH? JZ RCVSOH ;..YES ; ;EARLIER VERS. OF MODEM PROG SENT SOME NULLS - ;IGNORE THEM ; ORA A ;00 FROM SPEED CHECK? JZ RCVRPT ;YES, IGNORE IT CPI EOT ;END OF TRANSFER? STC ;RETURN WITH CARRY.. RZ ;..SET IF EOT ; ;DIDN'T GET SOH OR EOT - ; ;DIDN'T GET VALID HEADER - PURGE THE LINE, ;THEN SEND NAK. ; RCVSERR MVI B,1 ;WAIT FOR 1 SEC.. CALL RECV ;..WITH NO CHARS JNC RCVSERR ;LOOP UNTIL SENDER DONE MVI A,NAK ;SEND.. CALL SEND ;..THE NAK LDA ERRCT ;ABORT IF.. INR A ;..WE HAVE REACHED.. STA ERRCT ;..THE ERROR.. CPI ERRLIM ;..LIMIT? JC RCVRPT ;..NO, TRY AGAIN ; ;10 ERRORS IN A ROW - ; RCVSABT CALL CLOSFIL ;KEEP WHATEVER WE GOT CALL ERXIT DB '++UNABLE TO RECEIVE BLOCK ' DB '- ABORTING++',CR,LF,'$' ; ;TIMEDOUT ON RECEIVE ; RCVSTOT JMP RCVSERR ;BUMP ERR CT, ETC. ; ;GOT SOH - GET BLOCK #, BLOCK # COMPLEMENTED ; RCVSOH MVI B,1 ;TIMEOUT = 1 SEC CALL RECV ;GET SECTOR JC RCVSTOT ;GOT TIMEOUT MOV D,A ;D=BLK # MVI B,1 ;TIMEOUT = 1 SEC CALL RECV ;GET CMA'D SECT # JC RCVSTOT ;TIMEOUT CMA ;CALC COMPLEMENT CMP D ;GOOD SECTOR #? JZ RCVDATA ;YES, GET DATA ; ;GOT BAD SECTOR # ; JMP RCVSERR ;BUMP ERROR CT. ; RCVDATA MOV A,D ;GET SECTOR # STA RCVSNO ;SAVE IT MVI C,0 ;INIT CKSUM LXI H,BASE+80H ;POINT TO BUFFER ; RCVCHR MVI B,1 ;1 SEC TIMEOUT CALL RECV ;GET CHAR JC RCVSTOT ;TIMEOUT MOV M,A ;STORE CHAR INR L ;DONE? JNZ RCVCHR ;NO, LOOP ; ;VERIFY CHECKSUM ; MOV D,C ;SAVE CHECKSUM MVI B,1 ;TIMEOUT LEN. CALL RECV ;GET CHECKSUM JC RCVSTOT ;TIMEOUT CMP D ;CHECKSUM OK? JNZ RCVSERR ;NO, ERROR ; ;GOT A SECTOR, IT'S A DUP IF = PREV, ; OR OK IF = 1 + PREV SECTOR ; LDA RCVSNO ;GET RECEIVED MOV B,A ;SAVE IT LDA SECTNO ;GET PREV CMP B ;PREV REPEATED? JZ RECVACK ;ACK TO CATCH UP INR A ;CALC NEXT SECTOR # CMP B ;MATCH? JNZ ABORT ;NO MATCH - STOP SENDER, EXIT RET ;CARRY OFF - NO ERRORS ; ;PREV SECT REPEATED, DUE TO THE LAST ACK ;BEING GARBAGED. ACK IT SO SENDER WILL CATCH UP ; RECVACK CALL SENDACK ;SEND THE ACK, JMP RCVSECT ;GET NEXT BLOCK ; ;SEND AN ACK FOR THE SECTOR ; SENDACK MVI A,ACK ;GET ACK CALL SEND ;..AND SEND IT RET ; ;----> SENDHDR: SEND THE SECTOR HEADER ; ;SEND: (SOH) (BLOCK #) (COMPLEMENTED BLOCK #) ; SENDHDR MVI A,SOH ;SEND.. CALL SEND ;..SOH, LDA SECTNO ;THEN SEND.. CALL SEND ;..SECTOR # LDA SECTNO ;THEN SECTOR # CMA ;..COMPLEMENTED.. CALL SEND ;..SECTOR # RET ;FROM SENDHDR ; ;----> SENDSEC: SEND THE DATA SECTOR ; SENDSEC MVI C,0 ;INIT CKSUM LXI H,BASE+80H ;POINT TO BUFFER SENDC MOV A,M ;GET A CHAR CALL SEND ;SEND IT INR L ;POINT TO NEXT CHAR JNZ SENDC ;LOOP IF <100H RET ;FROM SENDSEC ; ;----> SENDCKS: SEND THE CHECKSUM ; SENDCKS MOV A,C ;SEND THE.. CALL SEND ;..CHECKSUM RET ;FROM SENDCKS ; ;----> GETACK: GET THE ACK ON THE SECTOR ; ;RETURNS WITH CARRY CLEAR IF ACK RECEIVED. ;IF AN ACK IS NOT RECEIVED, THE ERROR COUNT ;IS INCREMENTED, AND IF LESS THAN "ERRLIM", ;CARRY IS SET AND CONTROL RETURNS. IF THE ;ERROR COUNT IS AT "ERRLIM", THE PROGRAM ;ABORTS. ; GETACK MVI B,10 ;WAIT 10 SECONDS MAX CALL RECVDG ;RECV W/GARBAGE COLLECT JC GETATOT ;TIMED OUT CPI ACK ;OK? (CARRY OFF IF =) RZ ;YES, RET FROM GETACK ; ;TIMEOUT OR ERROR ON ACK - BUMP ERROR COUNT ; ACKERR LDA ERRCT ;GET COUNT INR A ;BUMP IT STA ERRCT ;SAVE BACK CPI ERRLIM ;AT LIMIT? RC ;NOT AT LIMIT ; ;REACHED ERROR LIMIT ; CSABORT CALL ERXIT DB '++CAN''T SEND SECTOR ' DB '- ABORTING++',CR,LF,'$' ; ;TIMEOUT GETTING ACK ; GETATOT JMP ACKERR ;NO MSG ; ABORT LXI SP,STACK ; ABORTL MVI B,1 ;1 SEC. W/O CHARS. CALL RECV JNC ABORTL ;LOOP UNTIL SENDER DONE MVI A,CAN ;CONTROL X CALL SEND ;STOP SENDING END ; ABORTW MVI B,1 ;1 SEC W/O CHARS. CALL RECV JNC ABORTW ;LOOP UNTIL SENDER DONE MVI A,' ' ;GET A SPACE... CALL SEND ;TO CLEAR OUT CONTROL X CALL ERXIT ;EXIT WITH ABORT MSG DB 'XMODEM PROGRAM CANCELLED',CR,LF,'$' ; ;----> INCRSNO: INCREMENT SECTOR # ; INCRSNO LDA SECTNO ;INCR.. INR A ;..SECT.. STA SECTNO ;..NUMBER RET ; ;----> CHEKFIL: SEE IF FILE EXISTS ; ;IF IT EXISTS, SAY IT MUST BE ERASED. ; CHEKFIL LXI D,FCB ;POINT TO CTL BLOCK MVI C,SRCHF ;SEE IF IT.. CALL BDOS ;..EXISTS INR A ;FOUND? RZ ;..NO, RETURN CALL ERXIT ;EXIT, PRINT ERROR MESSAGE DB '++FILE EXISTS, USE A DIFFERENT NAME++' DB CR,LF,'$' ; ;----> MAKEFIL: MAKES THE FILE TO BE RECEIVED ; MAKEFIL LXI D,FCB ;POINT TO FCB MVI C,MAKE ;GET BDOS FNC CALL BDOS ;TO THE MAKE INR A ;FF=BAD? RNZ ;OPEN OK ;DIRECTORY FULL - CAN'T MAKE FILE CALL ERXIT DB '++ERROR - CAN''T MAKE FILE++',CR,LF DB 'Directory must be full',CR,LF,'$' ; ;----> OPENFIL: OPENS THE FILE TO BE SENT ; OPENFIL LXI D,FCB ;POINT TO FILE MVI C,OPEN ;GET FUNCTION CALL BDOS ;OPEN IT INR A ;OPEN OK? JNZ OPENOK ;..YES CALL ERXIT ;..NO, ABORT DB '++FILE NOT FOUND++',CR,LF,'$' ; ;CHECK FOR DISTRIBUTION-PROTECTED FILE ; OPENOK LDA FCB+1 ;FIRST CHAR OF FILE NAME ANI 80H ;CHECK BIT 7 JZ OPENOK2 ;IT WAS OFF, FILE CAN BE SENT ; OPENOT CALL ERXIT ;EXIT W/MESSAGE DB '++THIS FILE IS NOT FOR DISTRIBUTION, SORRY++' DB CR,LF,'$' ; OPENOK2 EQU $ ; IF NOCOM LXI H,FCB+11 MOV A,M ;CHECK FOR PROTECT ATTR ANI 7FH ;REMOVE CP/M 2.x ATTRS CPI '#' ;CHK FOR '#' AS LAST FIRST JZ OPENOT ;IF '#', CAN'T SEND, SHOW WHY CPI 'M' ;IF NOT, CHK FOR '.COM' JNZ OPENOK3 ;IF NOT, OK TO SEND DCX H MOV A,M ;CHK NEXT CHAR ANI 7FH ;STRIP ATTRIBUTES CPI 'O' ; 'O'? JNZ OPENOK3 ;IF NOT, OK TO SEND DCX H MOV A,M ;NOW CHK FIRST CHAR ANI 7FH ;STRIP ATTRIBUTES CPI 'C' ; 'C' AS IN '.COM'? JNZ OPENOK3 ;IF NOT, CONTINUE CALL ERXIT ;EXIT W/MESSAGE DB '++CAN''T SEND A .COM FILE++' DB CR,LF,'$' ENDIF ; OPENOK3 CALL ILPRT ;PRINT: DB 'FILE OPEN, EXTENT LENGTH: ',0 LDA FCB+15 ;GET # SECTORS CALL HEXO ;PRINT IN HEX CALL ILPRT ;PRINT H AFTER NUMBER, THEN CR,LF DB 'H',CR,LF,0 RET ; ;----> CLOSFIL: CLOSES THE RECEIVED FILE ; CLOSFIL LXI D,FCB ;POINT TO FILE MVI C,CLOSE ;GET FUNCTION CALL BDOS ;CLOSE IT INR A ;CLOSE OK? RNZ ;..YES, RETURN CALL ERXIT ;..NO, ABORT DB '++CAN''T CLOSE FILE++',CR,LF,'$' ; ;----> RDSECT: READS A SECTOR ; ;FOR SPEED, THIS ROUTINE BUFFERS UP 16 ;SECTORS AT A TIME. ; RDSECT LDA SECINBF ;GET # SECT IN BUFF. DCR A ;DECREMENT.. STA SECINBF ;..IT JM RDBLOCK ;EXHAUSTED? NEED MORE. LHLD SECPTR ;GET POINTER LXI D,BASE+80H ;TO DATA CALL MOVE128 ;MOVE TO BUFFER SHLD SECPTR ;SAVE BUFFER POINTER RET ;FROM "READSEC" ; ;BUFFER IS EMPTY - READ IN ANOTHER BLOCK OF 16 ; RDBLOCK LDA EOFLG ;GED EOF FLAG CPI 1 ;IS IT SET/ STC ;TO SHOW EOF RZ ;GOT EOF MVI C,0 ;SECTORS IN BLOCK LXI D,DBUF ;TO DISK BUFFER RDSECLP PUSH B PUSH D MVI C,STDMA ;SET DMA.. CALL BDOS ;..ADDR LXI D,FCB MVI C,READ CALL BDOS POP D POP B ORA A ;READ OK? JZ RDSECOK ;YES DCR A ;EOF? JZ REOF ;GOT EOF ; ;READ ERROR ; CALL ERXIT DB '++FILE READ ERROR',CR,LF,'$' ; RDSECOK LXI H,80H ;ADD LENGTH OF ONE SECTOR... DAD D ;...TO NEXT BUFF XCHG ;BUFF TO DE INR C ;MORE SECTORS? MOV A,C ;GET COUNT CPI 16 ;DONE? JZ RDBFULL ;..YES, BUFF IS FULL JMP RDSECLP ;READ MORE ; REOF MVI A,1 STA EOFLG ;SET EOF FLAG MOV A,C ; ;BUFFER IS FULL, OR GOT EOF ; RDBFULL STA SECINBF ;STORE SECTOR COUNT LXI H,DBUF ;INIT BUFFER.. SHLD SECPTR ;..POINTER LXI D,BASE+80H ;RESET.. MVI C,STDMA ;..DMA.. CALL BDOS ;..ADDR JMP RDSECT ;PASS SECT TO CALLER ; ;----> WRSECT: WRITE A SECTOR ; ;WRITES THE SECTOR INTO A BUFFER. WHEN 16 ;HAVE BEEN WRITTEN, WRITES THE BLOCK TO DISK. ; ;ENTRY POINT "WRBLOCK" FLUSHES THE BUFFER AT EOF. ; WRSECT LHLD SECPTR ;GET BUFF ADDR XCHG ;TO DE FOR MOVE LXI H,BASE+80H ;FROM HERE CALL MOVE128 ;MOVE TO BUFFER XCHG ;SAVE NEXT.. SHLD SECPTR ;..BLOCK POINTER LDA SECINBF ;BUMP THE.. INR A ;..SECTOR #.. STA SECINBF ;..IN DHE BUFF CPI 16 ;HAVE WE 16? RNZ ;NO, RETURN ; ;----> WRBLOCK: WRITES A BLOCK TO DISK ; WRBLOCK LDA SECINBF ;# SECT IN BUFFER ORA A ;0 MEANS END OF FILE RZ ;NONE TO WRITE MOV C,A ;SAVE COUNT LXI D,DBUF ;POINT TO DISK BUFF ; DKWRLP PUSH H PUSH D PUSH B MVI C,STDMA ;SET DMA CALL BDOS ;TO BUFFER LXI D,FCB ;THEN WRITE MVI C,WRITE ;..THE.. CALL BDOS ;..BLOCK POP B POP D POP H ORA A JNZ WRERR ;OOPS, ERROR LXI H,80H ;LENGTH OF 1 SECT DAD D ;HL= NEXT BUFF XCHG ;TO DE FOR SETDMA DCR C ;MORE SECTORS? JNZ DKWRLP ;..YES, LOOP XRA A ;GET A ZERO STA SECINBF ;RESET # OF SECTORS LXI H,DBUF ;RESET BUFFER.. SHLD SECPTR ;..POINTER ; RSDMA LXI D,BASE+80H ;RESET.. MVI C,STDMA ;..DMA.. CALL BDOS ;..ADDR RET ; WRERR CALL RSDMA ;RESET DMA TO NORM. MVI C,CAN ;CANCEL.. CALL SEND ;..SENDER CALL ERXIT ;EXIT W/MSG: DB '++ERROR WRITING FILE++',CR,LF,'$' ; ;----> RECV: RECEIVE A CHARACTER ; ;TIMEOUT TIME IS IN B, IN SECONDS. ENTRY VIA ;"RECVDG" DELETES GARBAGE CHARACTERS ON THE ;LINE. FOR EXAMPLE, HAVING JUST SENT A SECTOR, ;CALLING RECVDG WILL DELETE ANY LINE-NOISE-INDUCED ;CHARACTERS "LONG" BEFORE THE ACK/NAK WOULD ;BE RECEIVED. ; RECVDG EQU $ ;RECEIVE W/GARBAGE DELETE IN MODDATP ;GET A CHAR IN MODDATP ;..TOTALLY PURGE UART ; RECV PUSH D ;SAVE ; IF FASTCLK ;4MHZ? MOV A,B ;GET TIME REQUEST ADD A ;DOUBLE IT MOV B,A ;NEW TIME IN B ENDIF ; MSEC LXI D,50000 ;1 SEC DCR COUNT ; IF NOT DCH MWTI IN MODCTLP ;CHECK STATUS ENDIF ; IF DCH MWTI IN MODCTL2 ;CHECK STATUS ENDIF ; ANI MODRCVB ;ISOLATE BIT CPI MODRCVR ;READY? JZ MCHAR ;GOT CHAR DCR E ;COUNT.. JNZ MWTI ;..DOWN.. DCR D ;..FOR.. JNZ MWTI ;..TIMEOUT DCR B ;MORE SECONDS? JNZ MSEC ;YES, WAIT ; ;MODEM TIMED OUT RECEIVING ; POP D ;RESTORE D,E STC ;CARRY SHOWS TIMEOUT RET ; ;GOT CHAR FROM MODEM ; MCHAR IN MODDATP ;READ THE CHAR POP D ;RESTORE DE ; ;CALC CHECKSUM ; PUSH PSW ;SAVE THE CHAR ADD C ;ADD TO CHECKSUM MOV C,A ;SAVE CHECKSUM POP PSW ;RESTORE CHAR ORA A ;CARRY OFF: NO ERROR RET ;FROM "RECV" ; ;----> SEND: SEND A CHARACTER TO THE MODEM ; SEND PUSH PSW ;SAVE THE CHAR ADD C ;CALC CKSUM MOV C,A ;SAVE CKSUM ; IF NOT DCH SENDW IN MODCTLP ;GET STATUS ENDIF ; IF DCH SENDW IN MODCTL2 ;GET STATUS ENDIF ; ANI MODSNDB ;ISOLATE READY BIT CPI MODSNDR ;READY? JNZ SENDW ;..NO, WAIT POP PSW ;GET CHAR OUT MODDATP ;OUTPUT IT RET ;FROM "SEND" ; ;----> WAITNAK: WAITS FOR INITIAL NAK ; ;TO ENSURE NO DATA IS SENT UNTIL THE RECEIVING ;PROGRAM IS READY, THIS ROUTINE WAITS FOR THE ;THE FIRST TIMEOUT-NAK FROM THE RECEIVER. ;(E) CONTAINS THE # OF SECONDS TO WAIT. ; WAITNAK MVI B,1 ;TIMEOUT DELAY CALL RECV ;DID WE GET.. CPI NAK ;..A NAK? RZ ;YES, SEND BLOCK DCR E ;80 TRIES? JZ ABORT ;YES, ABORT JMP WAITNAK ;NO, LOOP ; ;----> MOVEFCB: MOVES FCB(2) TO FCB ; ;I ATTEMPTED TO MAKE THE MODEM COMMAND 'NATURAL', ;I.E. MODEM SEND FILENAME (MODEM S FN.FT) RATHER ;THAN MODEM FILENAME SEND (MODEM FN.FT S) SO THIS ;ROUTINE MOVES THE FILENAME FROM THE SECOND FCB ;TO THE FIRST ; MOVEFCB LXI H,FCB+16 ;FROM LXI D,FCB ;TO MVI B,16 ;LEN CALL MOVE ;DO THE MOVE XRA A ;GET 0 STA FCBSNO ;ZERO SECTOR # STA FCBEXT ;..AND EXTENT RET ; CTYPE PUSH B ;SAVE.. PUSH D ;..ALL.. PUSH H ;..REGS MOV E,A ;CHAR TO E MVI C,WRCON ;GET BDOS FNC CALL BDOS ;PRIN THE CHR POP H ;RESTORE.. POP D ;..ALL.. POP B ;..REGS RET ;FROM "CTYPE" ; HEXO PUSH PSW ;SAVE FOR RIGHT DIGIT RAR ;RIGHT.. RAR ;..JUSTIFY.. RAR ;..LEFT.. RAR ;..DIGIT.. CALL NIBBL ;PRINT LEFT DIGIT POP PSW ;RESTORE RIGHT ; NIBBL ANI 0FH ;ISOLATE DIGIT CPI 10 ;IS IS <10? JC ISNUM ;YES, NOT ALPHA ADI 7 ;ADD ALPHA BIAS ; ISNUM ADI '0' ;MAKE PRINTABLE JMP CTYPE ;..THEN TYPE IT ; ;----> ILPRT: INLINE PRINT OF MSG ; ;THE CALL TO ILPRT IS FOLLOWED BY A MESSAGE, ;BINARY 0 AS THE END. ; ILPRT XTHL ;SAVE HL, GET HL=MSG ; ILPLP MOV A,M ;GET CHAR ORA A ;END OF MSG? JZ ILPRET ;..YES, RETURN CALL CTYPE ;TYPE THE MSG INX H ;TO NEXT CHAR JMP ILPLP ;LOOP ; ILPRET XTHL ;RESTORE HL RET ;PAST MSG ; ;----> ERXIT: EXIT PRINTING MSG FOLLOWING CALL ; ERXIT POP D ;GET MESSAGE MVI C,PRINT ;GET BDOS FNC CALL BDOS ;PRINT MESSAGE ; EXIT LHLD STACK ;GET ORIGINAL STACK SPHL ;RESTORE IT RET ;--EXIT-- TO CP/M ; ;MOVE 128 CHARACTERS ; MOVE128 MVI B,128 ;SET MOVE COUNT ; ;MOVE FROM (HL) TO (DE) LENGTH IN (B) ; MOVE MOV A,M ;GET A CHAR STAX D ;STORE IT INX H ;TO NEXT "FROM" INX D ;TO NEXT "TO" DCR B ;MORE? JNZ MOVE ;..YES, LOOP RET ;..NO, RETURN ; ;TEMPORARY STORAGE AREA ; RCVSNO DB 0 ;SECT # RECEIVED SECTNO DB 0 ;CURRENT SECTOR NUMBER ERRCT DB 0 ;ERROR COUNT ;FOLLOWING 3 USED BY DISK BUFFERING ROUTINES EOFLG DB 0 ;EOF FLAG (1=TRUE) SECPTR DW DBUF SECINBF DB 0 ;# OF SECTORS IN BUFFER DS 60 ;STACK AREA STACK DS 2 ;STACK POINTER ; ;16 SECTOR DISK BUFFER ; DBUF EQU $ ;16 SECTOR DISK BUFFER ; ; BDOS EQUATES (VERSION 2) ; RDCON EQU 1 WRCON EQU 2 PRINT EQU 9 CONST EQU 11 ;CONSOLE STAT OPEN EQU 15 ;0FFH=NOT FOUND CLOSE EQU 16 ; " " SRCHF EQU 17 ; " " SRCHN EQU 18 ; " " ERASE EQU 19 ;NO RET CODE READ EQU 20 ;0=OK, 1=EOF WRITE EQU 21 ;0=OK, 1=ERR, 2=?, 0FFH=NO DIR SPC MAKE EQU 22 ;0FFH=BAD REN EQU 23 ;0FFH=BAD STDMA EQU 26 ;SET DMA BDOS EQU BASE+5 FCB EQU BASE+5CH ;SYSTEM FCB FCBEXT EQU FCB+12 ;FILE EXTENT FCBSNO EQU FCB+32 ;SECTOR # FCB2 EQU BASE+6CH ;SECOND FCB ; END