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Assembly Source File | 1986-06-11 | 13.5 KB | 483 lines

; I2VI-1.ASM - Visual 1050 overlay for IMP - 02/07/86 ; ; USES 8251A I/O and 8253 ?? baudrate generator ; ; You will want to look this file over carefully. There are a number of ; options that you can use to configure the program to suit your taste. ; This file adapts the Visual 1050 computer to IMP.COM. ; ; Edit this file for your preferences then follow the "TO USE:" example ; shown below. ; ; Many terminals will clear the screen with a CTL-Z. If yours does, put ; a 1AH at CLEAR: (010AH). Many terminals use two characters, the first ; normally an ESC. For example, ESC *. In this case put '*' at CLEAR: ; (The ESC will automatically be typed with no CTL-character present.) ; If you don't know what your terminal uses, put a 0 at CLEAR: and IMP ; will scroll up 24 blank lines to clear the CRT for things like MENU, ; looking at the function key table, typing CTL-Z in command mode, etc. ; ; Use the "SET" command to change the baudrate when desired. The value ; at MSPEED controls the baudrate when the program is first called up. ; ; TO USE: First edit this file filling in answers for your own ; equipment. Then assemble with ASM.COM or equivalent ; assembler. Then use MLOAD to merge into the main file: ; ; MLOAD IMP.COM=IMP.COM,I2VI-x.HEX ; ; = = = = = = = = = = = = = = = = = = ; ; 10/27/85 - Written to work with IMP, adapted portions of M7VI-2.ASM. ; - Irv Hoff ; ; = = = = = = = = = = = = = = = = = ; ; YES EQU 0FFH NO EQU 0 ; ; BDOS EQU 0005H RDRIN EQU 3 ; Reader input function PNCHOUT EQU 4 ; Punch output function GETIO EQU 7 ; Get I/O byte SETIO EQU 8 ; Set I/O byte DIRBIOS EQU 50 ; Direct BIOS call ; ; ; Values shown are for a 8251A ; PORT EQU 8CH ; Your base port (data or status) MDCTL1 EQU PORT+1 ; Modem control port MDDATP EQU PORT ; Modem data port MDRCV EQU 02H ; Modem receive ready MDSND EQU 01H ; Modem send ready bit MDTXE EQU 05H ; Modem send buffer empty, holding buffer empty ; BDPORT EQU 92H ; Port for setting baudrate ; MDMODE EQU 82H ; Insures 8251 is out of mode with DTR high MDRSET EQU 42H ; Resets USART for additional commands MDSET1 EQU 4EH ; 1 stop bit, no parity, 8 bits, x16 MDSET2 EQU 0CEH ; 2 stop bits, no parity, 8 bits, x16 MDCOM EQU 17H ; Reset error flags, RCV, DTR, TX ready ; ; ; Table of baudrate parameters ; BD300 EQU 4F00H BD1200 EQU 4E00H BD2400 EQU 4E04H BD9600 EQU 4E08H BD19200 EQU 4E0CH ;..... ; ; ;----------------------------------------------------------------------- ; ESC EQU '['-40H ; ^[ = Escape BELL EQU 'G'-40H ; ^G = Bell character LF EQU 'J'-40H ; ^J = Linefeed NEXTRY EQU 'K'-40H ; ^K = Try next phone number, abort this try CR EQU 'M'-40H ; ^M = Carriage return CLEARSC EQU 'Z'-40H ; ^Z = Clears screen, command mode only EOFCHAR EQU 'Z'-40H ; ^Z = End of file ; ; ;----------------------------------------------------------------------- ; ; ORG 0100H ; ; DS 3 ; Skip the data area below ; ; ; These routines and equates are at the beginning of the program so ; they can be patched by a monitor or overlay file without re-assembling ; the program. ; MSPEED: DB 5 ; 0=110 1=300 2=450 3=600 4=710 5=1200 103H ; 6=2400 7=4800 8=9600 9=19200 default HS2400: DB NO ; Yes=2400 bps highest speed 104H HS1200: DB YES ; Yes=1200 bps highest speed 105H RACAL: DB NO ; Yes=Racal-Vadic 1200V or 2400V or 2400PA 106H PROMODM: DB NO ; Yes=Prometheus ProModem 1200 bps 107H RESVD1: DB NO ; Reserved for special modems 108H RESVD2: DB NO ; Reserved for special modems 109H ; ; CLEAR: DB 1AH ; Clear screen character (ESC not needed) 10AH CLOCK: DB 37 ; Clock speed in MHz x10, 25.5 MHz max. 10BH ; 20=2 MHh, 37=3.68 MHz, 40=4 MHz, etc. BYTDLY: DB 2 ; 0=0 delay 1=10ms 5=50 ms - 9=90 ms 10CH ; default time to send character in ter- ; minal mode file transfer for slow BBS CRDLY: DB 2 ; 0=0 delay 1=100 ms 5=500 ms - 9=900 ms 10DH ; default time for extra wait after CRLF ; in terminal mode file transfer NOFCOL: DB 5 ; Number of directory columns shown 10EH TCHPUL: DB 'T' ; T=tone, P=Pulse (Hayes 2400 modems) 10FH ;..... ; ; ADDLFD: DB NO ; Yes=add LF after CR to send file in terminal 110H ; mode (normally added by remote echo) CONVRUB: DB YES ; Yes=convert rub to backspace 111H CRCDFLT: DB YES ; Yes=default to CRC checking 112H IGNRCTL: DB NO ; Yes=CTL-chars above ^M not displayed 113H ;..... ; ; EXTCHR: DB '['-40H ; ESC = preceeds local control character 114H EXITCHR: DB 'E' ; Exit character 115H FILESND: DB 'F' ; Send file when in terminal mode 116H NOCONCT: DB 'N' ; Disconnect from phone line 117H LOGCHR: DB 'L' ; Send logon 118H LSTCHR: DB 'P' ; Toggle printer 119H UNSAVCH: DB 'R' ; Close input text buffer 11AH SAVECHR: DB 'Y' ; Open input text buffer 11BH CLEARS: DB 'Z' ; Clears screen, terminal mode 11CH SPARE1: DB 0 ; For future development 11DH NODTR: DB NO ; Yes if no DTR and need +++ to disconnect 11EH ;..... ; ; ; Handles in/out ports for data and status ; I$MDCTL1: RET ; Status port not used 11FH DB 0,0,0,0,0 ; Spares if needed 120H DB 0,0,0,0 ; Spares if needed 125H ; I$MDTXE: RET ; (Needed for SIO or DART register 1 129H DB 0,0,0,0,0 ; 12AH DB 0,0,0,0 ; 12FH ; I$MDDATP: JMP BDOS3 ; 133H DB 0,0,0,0,0,0,0 ; Spares if needed 136H ; O$MDDATP: JMP BDOS4 ; 13DH DB 0,0,0,0,0,0,0 ; Spares if needed 140H ;..... ; ; A$MDRCV: RET ; BDOS7 tests receive ready 147H DB 0,0 ; Spares if needed 148H ; C$MDRCV: JMP BDOS7 ; 14AH ; A$MDSND: RET ; BDOS8 tests send ready 14DH DB 0,0 ; C$MDSND: JMP BDOS8 ; BDOS8 checks for send ready 150H ; A$MDTXE: ANI MDTXE ; 153H RET ; 155H ; C$MDTXE: CPI MDTXE ; 156H RET ; 158H ;..... ; ; ; Special exit vector, used by some computers to reset interrupt vectors ; J$EXITVEC:RET ; 159H DB 0,0 ; 15AH ;..... ; ; ; Jump vectors needed by each overlay ; J$GOODBYE:JMP GOODBYE ; Disconnects modem by dropping DTR 15CH J$INITMOD:JMP INITMOD ; Initializes modem, autosets baudrate 15FH J$STUPR: JMP STUPR ; SET routine to change baudrate 162H J$SYSVR: JMP SYSVR ; Signon message 165H ;..... ; ; ; "AT" command strings, can be replaced in individual overlay if needed ; J$STRNGA: DS 3 ; 1200 bps "AT" string 168H J$STRNG1: DS 3 ; 2400 bps "AT" string 16BH ; ; ; Next fourteen lines should not be changed by user overlay as these go ; to specific locations in the main program, not in the overlay. ; ; J$CMDSPL: DS 3 ; Allows entry of baudrate on CMD line 16EH J$CRLF: DS 3 ; Turns up one new line on display 171H J$DIAL: DS 3 ; Start of dialing routine 174H J$DSCONT: DS 3 ; Terminates modem use 177H J$GOLST: DS 3 ; Printer routine, needed by Apple //e 17AH J$ILPRT: DS 3 ; Prints an inline string, 0 to end 17DH J$INBUF: DS 3 ; Stores a keybd string for comparison 180H J$INLNCP: DS 3 ; Inline "compare strings" routine 183H J$INMDM: DS 3 ; Max .1 sec wait for modem character 186H J$RCVRSP: DS 3 ; For 3801 I/O use (TV-803) 189H J$SNDCHR: DS 3 ; Sends a character to the modem 18CH J$SNDSTR: DS 3 ; Sends a string to the modem, $ to end 18FH J$TIMER: DS 3 ; .1 second timer (amount in 'B' reg.) 192H J$NEW1: DB 0,0,0 ; For future needs 195H J$NEW2: DB 0,0,0 ; For future needs 198H ;..... ; ; ; For 2400 bps auto-stepdown units ; MANUAL: DB 0 ; For manual selection flag 19BH J$300: JMP OK300 ; Sets baudrate to 300 baud 19CH J$1200: JMP OK1200 ; Sets baudrate to 1200 bps 19FH J$2400: JMP OK2400 ; Sets baudrate to 2400 bps 1A2H ;..... ; ; LOGPTR: DW LOGON ; Pointer to display LOGON message 1A5H ; SYSVR: CALL J$ILPRT ; Display the following line 1A7H DB 'Version for Visual 1050 modem port 8CH' ; 1AAH DB CR,LF,0 RET ;..... ; ; ;----------------------------------------------------------------------- ; ; NOTE: You can change the SYSVER message to be longer or shorter. The ; end of your last routine should terminate by 0400H (601 bytes ; available after start of SYSVER). ; ;----------------------------------------------------------------------- ; ; You can put in a message at this location which can be called up with ; (special character-L). You can put in several lines. End with a 0. ; LOGON: DB 'This is a Visual 1050 Computer.... ',0 ; ;----------------------------------------------------------------------- ; ; This routine sets DTR low for 300 ms to disonnect the phone ; GOODBYE:MVI B,'S'-40H ; X-off to stop host if needed CALL J$SNDCHR MVI B,1 ; Wait a moment to let it react CALL J$TIMER MVI A,3DH ; Send break, turn off DTR CALL SETMCTL ; Send to status port MVI B,3 ; Delay 300 ms to hang up phone CALL J$TIMER MVI A,37H ; Normal send/receive with DTR JMP SETMCTL ; Send to status port, finished ;..... ; ; INITMOD:LDA MSPEED ; Get the selected value CPI 1 ; 300 bps JZ OK300 CPI 5 ; 1200 bps JZ OK1200 CPI 6 ; 2400 bps JZ OK2400 CPI 8 ; 9600 bps JZ OK9600 CPI 9 ; 19200 JZ OK19200 JMP STUPR1 ; Else ask what is wanted ;..... ; ; ; The following routines replace direct modem port I/O with BDOS calls. ; The Visual 1050 BIOS uses interrupt-driven I/O with ring buffers. ; This solves the problem of losing modem input while the console dis- ; play does a carriage return. ; ; Check for input character (receive ready) ; BDOS7: PUSH B ; Save the registers MVI C,GETIO ; BDOS function number JMP BDOS78 ; Common routine for BDOS 7 & 8 ; ; ; Check for output character (send ready) ; BDOS8: PUSH B ; Save the registers MVI C,SETIO ; BDOS function number ; BDOS78: PUSH D PUSH H CALL BDOS POP H ; Restore the registers POP D POP B ORA A ; Bdos returns A=0 if not ready JZ CLRZ ; Return Z flag off if not ready XRA A ; Set Z flag if ready RET ; CLRZ: INR A ; Clear Z flag (make a non-zero) RET ;..... ; ; ; Input a character from modem via BIOS ring buffer ; BDOS3: PUSH B ; Save the registers PUSH D PUSH H MVI C,RDRIN ; BDOS function number CALL BDOS POP H ; Restore the registers POP D POP B RET ; Input character is in 'A' register ;..... ; ; ; Ouput a character to modem via BIOS ring buffer ; BDOS4: PUSH B ; Save the registers PUSH D PUSH H MVI C,PNCHOUT ; BDOS function number MOV E,A ; Character to output must be in 'E' CALL BDOS POP H ; Restore the registers POP D POP B RET ;..... ; ; ; The Visual 1050 BIOS keeps the current value of the modem control ; register in a special byte. We must modify this byte whenever we ; change the value of this register, or the BIOS will clobber it when- ; ever it gets an interrupt from the modem port. ; SETMCTL:PUSH H LHLD RSPAR ; Address of BIOS byte MOV M,A ; Save new value there OUT MDCTL1 ; Output to modem control register POP H RET ;..... ; ; STUPR: CALL J$CMDSPL ; Gives us CMDBUF+6 JNC STUPR2 ; STUPR1: CALL J$ILPRT DB 'Input Baud Rate (300, 1200, 2400, 9600, 19200): ',0 LXI D,BAUDBUF ; Point to new input buffer CALL J$INBUF CALL J$CRLF LXI D,BAUDBUF+2 ; STUPR2: CALL J$INLNCP ; Compare BAUDBUF+2 with chars. below DB '300',0 JNC OK300 ; Go if got match CALL J$INLNCP DB '1200',0 JNC OK1200 CALL J$INLNCP DB '2400',0 JNC OK2400 CALL J$INLNCP DB '9600',0 JNC OK9600 CALL J$INLNCP DB '19200',0 JNC OK19200 CALL J$ILPRT ; All matches failed, tell operator DB '++ Incorrect entry ++',CR,LF,BELL,CR,LF,0 JMP STUPR1 ; Try again ; OK300: MVI A,1 LXI H,BD300 JMP LOADBD ; OK1200: MVI A,5 LXI H,BD1200 JMP LOADBD ; OK2400: XRA A STA MANUAL ; Reset to maximum auto-speed MVI A,6 LXI H,BD2400 JMP LOADBD ; OK9600: MVI A,8 LXI H,BD9600 JMP LOADBD ; OK19200:MVI A,9 LXI H,BD19200 ; LOADBD: STA MSPEED ; Change time-to-send to match baudrate SHLD STASPD MVI A,3FH ; Get byte to enable interrupts OUT 9DH ; Enable them... ; ; ; The Visual 1050 provides a special function which returns the address ; of the byte where the BIOS keeps the current value of the modem con- ; trol register. We must modify this byte whenever we change the value ; of this register, or the BIOS will clobber it whenever it gets an in- ; terrupt from the modem port. ; LXI D,BIOSPB ; Parameter block for BIOS call MVI C,DIRBIOS ; BDIS function for direct BIOS call CALL BDOS SHLD RSPAR ; Save the returned address ; ; ; Sets 8251 to 8 bits, DTR, RCV and TX ready ; MVI A,MDMODE ; Insure 8251 is out of mode OUT MDCTL1 XTHL ; Small delay to complete command XTHL MVI A,MDRSET ; Reset the 8251A for new command OUT MDCTL1 XTHL ; Small delay to complete command XTHL ; ; ; Set the 8251A to x16 or x64 ; LDA STASPD ; Get the x16 or x64 value OUT MDCTL1 ; Modem status port (mode word) MVI A,MDCOM ; DTR, RCV, XMT, error reset CALL SETMCTL ; Modem status port ; ; ; Now set the baud rate ; LDA STASPD+1 ; Get the timer speed STA BAUD+1 IN BDPORT ; Get what was there ANI 0F3H ; Clear out the old baud rates ; BAUD: ORI 0 ; Set new default to 1200 OUT BDPORT ; New baud rate now set RET ;..... ; ; ; Data area ; BAUDBUF:DB 10,0,0,0,0,0 DB 0,0,0,0,0,0 BIOSPB: DB 30,3 RSPAR: DB 0,0 ; Address of BIOS STASPD: DB 0,0 ; Store the requested baud rate temp. ;..... ; ; end ;----------------------------------------------------------------------- ; ;NOTE: Must terminate by 0400H ; END