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Assembly Source File | 1986-06-11 | 11.6 KB | 393 lines

; I2AM-1.ASM - AMPRO "Little Board" overlay file for IMP - 10/27/85 ; ; Z80 DART and 8430 CTC timer and 2.000 MHz clock ; ; This overlay adapts the IMP modem program to the AMPRO Series 100 ; computer with the Z80 DART serial port "B" and the Z80 CTC baud rate ; generator. ; ; Important: This computer does not use a clock that divides ; to the exact baud rate desired. For instance, ; 2400 bps comes out 2403.846 Hz. A 1.9968 xtal ; would be needed. 9600 bps is actually 9615.385 Hz. ; ; ; CTS and RTS are used with the AMPRO computer as ; it does not support DTR or DCD - however it puts ; CTS on pin 20 which historically holds the DTR. ; Just be sure to drop CTS to hang up the phone. ; ; You will need to use the following wiring circuit: ; ; Modem Ampro ; ----- ----- ; pin 2 pin 3 ; pin 3 pin 2 ; pin 7 pin 7 ; pin 8 pin 20 ; pin 20 pin 5 ; ; The Ampro DB-25 connector is shown wired per factory standards. ; ;----------------------------------------------------------------------- ; ; 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,I2AM-x.HEX ; ; = = = = = = = = = = = = = = = = = = ; ; 11/05/85 - Added 9600 baud, etc. - Irv Hoff ; 10/27/85 - Written to work with IMP - Irv Hoff ; ; = = = = = = = = = = = = = = = = = ; ; YES EQU 0FFH NO EQU 0 ; ; ; Values shown are for a Z80 DART ; PORT EQU 88H ; Your base data port MDCTL1 EQU PORT+4 ; Modem control port MDDATP EQU PORT ; Modem data port MDRCV EQU 01H ; Modem receive ready MDSND EQU 04H ; Modem send ready bit MDTXE EQU 01H ; Modem send buffer empty, holding buffer empty ; BRPORT EQU 50H ; Baud rate generator port (CTC) ; ; ;----------------------------------------------------------------------- ; 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 = Clear 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 '*' ; Clear screen character (ESC not needed) 10AH CLOCK: DB 40 ; 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$MDCTL1: MVI A,10H ; Register 0, reset interrupts 11FH OUT MDCTL1 ; 121H IN MDCTL1 ; 123H RET ; IN modem control port 125H DB 0,0,0 ; Spares if needed 126H ; I$MDTXE: MVI A,11H ; Select read register 1 129H OUT MDCTL1 ; 12BH IN MDCTL1 ; 12DH RET ; 12FH DB 0,0,0 ; 130H ; I$MDDATP: IN MDDATP ; 137H RET ; 139H DB 0,0,0,0,0,0,0 ; Spares if needed 13AH O$MDDATP: OUT MDDATP ; 13DH RET ; OUT modem data port 13FH DB 0,0,0,0,0,0,0 ; Spares if needed 140H ;..... ; ; A$MDRCV: ANI MDRCV ; 147H RET ; 149H ; C$MDRCV: CPI MDRCV ; 14AH RET ; 14CH ; A$MDSND: ANI MDSND ; 14DH RET ; 14FH ; C$MDSND: CPI MDSND ; 150H RET ; 152H ; 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 the Ampro Little Board ' ; 1AAH DB 'using Port 88H',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 an Ampro Little Board computer. ',CR,LF,0 ; ;----------------------------------------------------------------------- ; ; ; This routine sets DTR and RTS low for 300 ms to disconnect 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,5 OUT MDCTL1 ; Sned to the status port MVI A,068H ; Turn off DTR, RTS, send break OUT MDCTL1 MVI B,3 ; Wait 300 ms CALL J$TIMER MVI A,5 OUT MDCTL1 MVI A,0EAH ; Restore normal, 8 bits, RTS on, etc. OUT MDCTL1 RET ;..... ; ; ; IMS baud rate change. Sets CTC for baud rate. ; INITMOD: MVI A,0 ; Select register OUT MDCTL1 ; Send to the status port MVI A,18H ; Reset the Z8SIO chip OUT MDCTL1 ; Send to the status port MVI A,4 ; Select register OUT MDCTL1 ; Send to the status port MVI A,44H ;*32x, 2-stop, no parity (84=1, 8C=2) OUT MDCTL1 ; Send to the status port MVI A,3 ; Select register OUT MDCTL1 ; Send to the status port MVI A,0C1H ; Enable receive section OUT MDCTL1 ; Send to the status port MVI A,5 ; Select register OUT MDCTL1 ; Send to the status port MVI A,0EAH ; DTR, RTS, 8-bits, enable send section OUT MDCTL1 ; Send to the status port ; LDA MSPEED ; Get the selected value CPI 1 ; 300 bps JZ OK300 CPI 5 ; 1200 bps JZ OK1200 CPI 6 ; 2400 bps JZ OK2400 CPI 8 ; 9600 bps JZ OK9600 JMP STUPR1 ; Else ask what is wanted ;..... ; ; STUPR: CALL J$CMDSPL ; Gives us CMDBUF+6 JNC STUPR2 ; STUPR1: CALL J$ILPRT DB 'Input Baud Rate (300, 1200, 2400, 9600): ',0 LXI D,BAUDBUF ; Point to new input buffer CALL J$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$INLNCP DB '9600',0 JNC OK9600 CALL J$ILPRT ; All matches failed, tell operator DB '++ Incorrect entry ++',CR,LF,BELL,CR,LF,0 JMP STUPR1 ; Try again ; OK300: MVI A,1 ; MSPEED 300 baud value LXI H,BD300 ; Get 300 bps parameters in 'HL' JMP LOADBD ; Go load them ; 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 ; OK0600: MVI A,8 LXI H,BD9600 ; LOADBD: STA MSPEED ; Change time-to-send to match baud rate MOV A,H ; Command word OUT BRPORT MOV A,L ; Baudrate OUT BRPORT RET ;..... ; ; ; Table of baud rate parameters ; BD300 EQU 0734H ; 15600/300 (first half is CTC command) BD1200 EQU 4768H ; 124800/1200 BD2400 EQU 4734H ; 124800/2400 BD9600 EQU 470DH ; 124800/9600 ; BAUDBUF:DB 10,0,0,0,0,0 DB 0,0,0,0,0,0 ; ; end ;----------------------------------------------------------------------- ; ; NOTE: Must terminate prior to 0400H ; END