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Assembly Source File | 1987-06-06 | 14.9 KB | 469 lines

; I2C8-2.ASM - Commodore C128 overlay for IMP - 06/01/87 ; ; This Commodore C128 overlay for IMP supports the Commodore 1670 modem, ; the Hayes Smartmodem 1200 or any similar modem using the Hayes "AT" ; command set, the Prometheus 1200 modem or any Racal-Vadic autodial ; modem. ; ; NOTE: Modems for the Commodore C128 plug into the "user's port". The ; Commodore 1670 modem plugs in directly. Other brands of modems ; can be used, but an adapter interface is needed to convert that ; port to a RS232 type connector. This is called a 1011A adapter ; by Commodore. The Omni-Tronics firm makes such an adapter which ; comes with a RS-232 cable to plug into the modem. ; ; The Commodore 1670 does not support DTR ; so if using that modem, be sure to use: ; ; NODTR EQU YES ; ; in the equates below. This substitutes ; the "pause +++ pause ATH0" command for ; dropping DTR. If using a modem that ; does support DTR, you can instead use: ; ; NODTR EQU NO ; ; since dropping DTR for 1/2 second is far ; faster than the "pause +++ pause ATH0". ; Also not all external modems support the ; Hayes AT commands, etc. The DTR/+++ is ; used to remotely disconnect the modem ; from the telephone line. ; ; NOTE: The times quoted for file transfer will likely be less than what ; will be observed when using the C128 computer. This is mostly ; due to the way the information is sent to the disk and then ver- ; ified. As a result, it takes around 7-8 seconds to dump only 4k ; to the Commodore 1571 disk system. (Most disk systems take only ; 5-6 seconds to dump 16k.) Consequently, this Commodore overlay ; has a line at the very end which sets byte 0BFFH to dump every ; 4k (32 record intervals), so it will finish prior to a 10-second ; time-out error. (The 1541 disks are slower yet and that byte ; may need to be changed to dump at 2k intervals if using the 1541 ; disk drive, to prevent timeout errors.) ; ; The printer command has been disabled - due to the way the 1200 ; bps modem "bit-banging" has been implemented into the Commodore ; C128, the printer can not be used at the same time the modem is ; being used. ; ; IMPORTANT: IF YOU GOT THE "I2NM-n.ASM" FILE FOR CHANG- ; ING THE PHONE NUMBER LIBRARY, AT THIS TIME ; GO CHANGE THE LABEL "XFRSIZE" FROM 16 TO 4 ; SO IF/WHEN YOU USE THAT PROGRAM, IT WILL SET ; THE 0BFF BYTE CORRECTLY FOR THE COMMODORE ; TO DUMP TO DISK EACH 4K. (IF YOU DO THAT ; WHILE READING THIS, YOU WON'T FORGET IT.) ; ; - Notes by Irv Hoff W6FFC ; ;----------------------------------------------------------------------- ; ; 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 Commodore C128 (with external modem) 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. ; ; NOTE: The Commodore C128 does not have an authentic serial ; port and thus can only run 1200 bps maximum speed. ; ; 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,I2C8-x.HEX ; ; = = = = = = = = = = = = = = = = = = ; ; 06/01/87 Improved the GOODBYE routine, added BREAK routine, needs ; IMP245 to use it. (Not fully implemented for this computer ; as yet.) - Irv Hoff ; ; 12/12/85 Written to work with IMP, based on work done for MDM740 for ; the C128 by Von Ertwine. - Irv Hoff ; ; = = = = = = = = = = = = = = = = = ; ; YES EQU 0FFH ; Some assemblers cannot use NOT NO or NO EQU 0 ; 0FFFFH for "YES", notably ASM.COM. ; ; ; C128 data ; PORT EQU 6 MEMRY EQU 0FD4EH MDCTL1 EQU MEMRY+1 SNDDAT EQU MEMRY+2 RCVDAT EQU MEMRY+3 MDRCV EQU 01H ; Modem receive ready MDSNDB EQU 80H ; bit to test for send MDSNDR EQU 00H ; value when send ready MDTXE EQU 00H ; ; ;----------------------------------------------------------------------- ; 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 12 ; Special clock speed, set for C128 at 1200 bps 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 YES ; 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 NO ; Toggle printer (unavailable to C128 users) 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 BRKCHR: DB 'Q' ; Send a break tone 11DH NODTR: DB YES ; Yes if no DTR and need ATH0 to disconnect 11EH ;..... ; ; ; Handles in/out ports for data and status ; I$MDCTL1: LDA MDCTL1 ; Get status byte to A-reg. 11FH RET ; 121H DB 0,0,0,0,0,0 ; Spares if needed 122H ; I$MDTXE: LDA MDCTL1 ; (Needed for SIO or DART register 1 129H RET ; 12BH DB 0,0,0,0,0,0 ; 12CH ; I$MDDATP: LDA RCVDAT ; Get the character 133H JMP GETDAT ; 136H DB 0,0,0,0 ; 139H ; O$MDDATP: STA SNDDAT ; Output the character 13DH JMP OUTDAT ; 140H DB 0,0,0,0 ; Spares if needed 143H ;..... ; ; A$MDRCV: ANI MDRCV ; 147H RET ; 149H ; C$MDRCV: CPI MDRCV ; 14AH RET ; 14CH ; A$MDSND: ANI MDSNDB ; 14DH RET ; 14FH ; C$MDSND: CPI MDSNDR ; 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$EXITVEC:JMP SET300 ; Put C128 back to 300 baud clock 159H ;..... ; ; ; Jump vectors needed by each overlay ; J$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: JMP SPLSTR ; 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$TIMER: DS 3 ; .1 second timer (amount in 'B' reg.) 192H J$BREAK: JMP SENDBRK ; Break routine 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 'Commodore C128 Version' ; 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 'C128 running CP/M 3.0',CR,LF,0 ; ;----------------------------------------------------------------------- ; ; ; This routine allows a 300 ms break tone to be sent. ; SENDBRK: RET ;..... ; ; ; This routine sets DTR low for 300 ms to disonnect the phone ; GOODBYE: LXI B,0DD01H ; Dataport B DB 0EDH,78H ; Input A (Z80 instruction) ANI 0F9H DB 0EDH,79H ; Output the new value, to disconnect MVI B,3 ; For 300 ms. CALL J$TIMER LXI B,0DD01H ; Reset back to normal DB 0EDH,78H ORI 6 DB 0EDH,79H RET ;..... ; ; ; Sets 8251 to 8 bits, DTR, RCV and TX ready ; INITMOD:MVI A,1 ; Set to 8 bits, no parity STA MEMRY ; Configure byte in BIOS LDA MSPEED ; Get the selected value CPI 1 ; 300 bps JZ OK300 CPI 5 ; 1200 bps JZ OK1200 JMP STUPR1 ; Else ask what is wanted ;..... ; ; ; Initialize the port, baudrate is now in the B-reg. find where it goes ; and put it there. ; INIT1: PUSH B ; Temporarily store the baudrate value LHLD 0000H+1 ; Get BIOS address LXI D,57 ; CP/M JMP device table DAD D ; Index into BIOS CALL INIT2 ; Jumps to address now in HL ; returns with HL=char device tbl start LXI D,PORT*8+7 ; Offset to RS232 baud rate DAD D ; Point to RS232 baud rate byte ; Byte now in HL POP B ; Get the baudrate value back MOV M,B ; Store the requested baud rate ; ; ; Have now stored desired baudrate, find the address in BIOS where the ; port will be initialized, put the correct port into the 'C' register ; and then initialize that port to baud rate just set, finished. ; LHLD 0000H+1 ; Get BIOS address LXI D,60 ; CP/M init address DAD D ; Index into BIOS MVI C,PORT ; Tell it what port to initialize ; ; ; Jumps to HL address, performs that routine, then returns to original ; area that called this area. ; INIT2: PCHL ; Jump to that routine then return ;..... ; ; ; We found there was a character, got it, but have to manually reset the ; flag to zero saying we did get the character. ; GETDAT: PUSH H ; Save the current address just in case LXI H,MDCTL1 ; Address of status byte DB 0CBH,86H ; Reset the 0 bit of the HL status byte POP H ; Restore the original address RET ; Return with the character ;..... ; ; ; Output character has been stored in the BIOS memory location, now set ; the flag showing there is a charcter ready. ; OUTDAT: PUSH H ; Save any current address, if needed LXI H,MDCTL1 ; Address of the status byte DB 0CBH,0FEH ; Set bit 7 of the HL status byte POP H ; Get the original address back RET ; All done ;..... ; ; STUPR: CALL J$CMDSPL ; Gives us CMDBUF+6 JNC STUPR2 ; STUPR1: CALL J$ILPRT DB 'Input Baud Rate (300, or 1200): ',0 LXI D,BAUDBUF ; Point to new input buffer CALL J$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$INLNCP DB '1200',0 JNC OK1200 CALL J$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 MVI B,BD300 ; Get 300 baud parameters in 'HL' JMP LOADBD ; Go load them ; OK1200: MVI A,5 MVI B,BD1200 JMP LOADBD ; OK2400: JMP OK1200 ; C128 does not support 2400 bps ; LOADBD: STA MSPEED ; Change time-to-send to match baudrate JMP INIT1 ;..... ; ; ; TABLE OF BAUDRATE PARAMETERS ; BD300 EQU 6 ; Divisor for 300 baud BD1200 EQU 8 ; Divisor for 1200 bps ; BAUDBUF:DB 10,0,0,0,0,0 DB 0,0,0,0,0,0 ;..... ; ; SET300: MVI B,BD300 JMP INIT1 ;..... ; ; ; Initialization string - the '#' character is a 100 ms. delay, at least ; four should be used after a CR following a commnd. ; SPLSTR: DB 'ATV0',CR,'####','ATE1Q0X1',CR,'####','$' ; ; ; This sets the size of the disk dump. Most Commodore systems write to ; disk so slowly that 4k is a good figure to use to insure finishing ; prior to a 10-second timeout at the other end (which causes them to ; resend the last transmission again, etc.) ; ORG 0BFFH ; DB 20H ; 20h=4k, 40h=8k, 80h=16k disk dumps ;..... ; ; ; NOTE: Must terminate by 0400H ; END