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Assembly Source File | 1994-07-13 | 15.8 KB | 538 lines

; I2OV-2.ASM - Osborne Vixen/OCC4 overlay file for IMP - 08/07/85 ; ; 8251A IO and 8155 baudrate generator ; ; The Osborne Vixen/OCC4 requires that pin 5 on its serial port be con- ; nected to an RS-232 pin which has a "SPACE" signal present. This sig- ; nal can be found on most RS-232 modems as pin 5 (CLEAR TO SEND - CTS). ; The Vixen is already wired as "DCE" not "DTE", so no cross-wiring from ; 2 and 3 is needed as in most computers. The cable between the Vixen ; OCC4 and your modem should contain the following. The optional wire ; is not needed for use with IMP, but would be needed if used with BYE3 ; for RCPM use: ; ; VIXEN MODEM ; 2 ------------ 2 TXD data out ; 3 ------------ 3 RXD data in ; 5 ------------ 5 CTS, required ; 6 ------------ 8 (*) ; 7 ------------ 7 ground ; 20 ------------ 20 DTR ; ; (*) Required for BYE3 or BYE5, unnecessary otherwise ; ;----------------------------------------------------------------------- ; ; 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,I2DP-x.HEX ; ; = = = = = = = = = = = = = = = = = = ; ; 08/07/85 Diagram clarified, no other change - Roy Robinson ; 07/17/85 Adapted for use with IMP - Irv Hoff ; 02/10/85 Modified for Osborne Vixen/OCC-4 - Roy Robinson ; ; = = = = = = = = = = = = = = = = = ; ; YES EQU 0FFH NO EQU 0 ; ; ; Values shown are for a 8251A ; PORT EQU 30H ; 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 ; 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 37H ; Reset error flags, RTS, Rxd, DTR, Txd on ; AJUMP EQU 0C3H ; JUMP instruction opcode BDOS EQU 0005H ; Address of BDOS entry point in 1st page of RAM BIOS EQU 0001H ; Pntr address of CP/M warm boot jump in BIOS EXITCPM EQU 2C80H ; Address of CP/M warm boot jump in EXIT routine INTVEC EQU 0EFFEH ; Address of interrupt vector to first interrupt ; service routine ; ;----------------------------------------------------------------------- ; 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 6 ; 0=110 1=300 2=450 3=600 4=710 5=1200 103H ; 6=2400 7=4800 8=9600 9=19200 default HS2400: DB YES ; Yes=2400 bps highest speed 104H HS1200: DB NO ; 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 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 SPARE2: DB 0 ; For future development 11EH ;..... ; ; ; Handles in/out ports for data and status ; I$MDCTL1: DI ; 11FH IN MDCTL1 ; 120H EI ; 122H RET ; IN modem control port 123H DB 0,0,0,0,0 ; Spares if needed 124H ; I$MDTXE: DI ; 129H IN MDCTL1 ; (Needed for SIO or DART register 1 12AH EI ; 12CH RET ; 12DH DB 0,0,0,0,0 ; 12EH ; I$MDDATP: DI ; 13DH IN MDDATP ; 13EH EI ; 140H RET ; 141H DB 0,0,0,0,0 ; Spares if needed 142H ; O$MDDATP: EI OUT MDDATP ; 147H DI RET ; OUT modem data port 149H DB 0,0,0,0,0 ; Spares if needed 14AH ;..... ; ; 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$EXITVEC:JMP RSTINT ; 159H ; 15AH ;..... ; ; ; Jump vectors needed by each overlay ; J$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 Osborne Vixen/OCC 4',CR,LF ; 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 'Greetings from an Osborne Vixen user',CR,LF,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,15H ; Send break, turn off RTS, DTR, Rx CALL OUTMDCTL1 ; Send to status port MVI B,3 ; Delay 300 ms to hang up phone CALL J$TIMER MVI A,MDCOM ; Normal send/receive with DTR, RTS JMP OUTMDCTL1 ; Send to status port ;..... ; ; OUTMDCTL1: DI OUT MDCTL1 EI RET ;..... ; ; ; You can use this area for any special initialization or setup you may ; wish to include. Each must stop with a RET. You can check the other ; available overlays for ideas how to write your own routines if that ; may be of some help. ; INITMOD: MVI C,7 ; Use BDOS to obtain current IOBYTE CALL BDOS ; STA OLDIOB ; Save old IOBYTE ANI 3FH ; ORI 80H ; Make CEN: port new LST: device MOV E,A MVI C,8 CALL BDOS ; Use BDOS to place new IOBYTE in first ; page of memory ; DI ; DISABLE interrupts LHLD INTVEC ; Get serial port interrupt processor ; address SHLD OLDVEC ; Save serial port interrupt processor ; address DCX H DCX H DCX H ; HL = next interrupt processor address SHLD INTVEC ; Now have first interrupt processor ; rather than second ; ; ; Initialize the interrupt vector system ; LHLD BIOS ; Find start of BIOS MVI L,3CH ; Displacement of baud rate byte from ; start of BIOS STA OLDBAUD ; Save original baud rate byte ; MVI L,3BH ; Displacement of 8251 mode byte from ; start of bios MOV A,M ; Old mode byte set by ROM is 2sb, no ; parity, 8db, x16 clock STA OLDMODE ; Save original 8251 mode byte ; MOV B,L MVI A,MDSET1 ; 1 sb, np, 8 db, x16 clock mode byte CALL IORESET ; Use extended bios jump to reset 8251 MVI A,MDCOM ; RTS, DTR, Txd, Rxd on OUT 31H ; Send it to 8251 control port MVI A,3 ; Select 8155 port C OUT 21H ; IN 28H ; Get miscellaneous information byte STA OLDMSC ; Save miscellaneous information byte ; ; ; Disable ring detect interrupt, Rxd interrupt, Txd ; ORI 0FH MOV E,A ; Interrupt, enable internal clock MVI A,3 OUT 21H ; Select 8155 port C MOV A,E OUT 28H ; Send new control byte to 8155 port c EI ; RESTORE interrupts ; ; ; Set requested baudrate then finished with initialization ; 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 bps JZ OK19200 JMP STUPR1 ; Else ask what is wanted ;..... ; ; ;----------------------------------------------------------------------- ; ; Reset original interrupt vectors upon EXIT from program ; RSTINT: LDA OLDIOB ; Get original IOBYTE MVI C,8 MOV E,A ; Use BDOS to restore original IOBYTE CALL BDOS ; DI ; DISABLE interrupts MVI A,15H ; RTS, DTR off LHLD OLDVEC ; Get original interrupt service address SHLD INTVEC ; Restore orig interrupt service address MVI A,3 ; Select 8155 port C OUT 21H IN 28H ; Get miscellaneous information byte for ; controlling interrupt lines ANI 030H ; Zero the least significant four bits MOV E,A LDA OLDMSC ; Get original misc. 8155 control byte ANI 0FH ; Zero the most significant four bits ORA E ; Combine everything MOV E,A ; Store temporarily ; MVI A,3 OUT 21H ; Select 8155 port C, again MOV A,E ; Store the value held in "E" OUT 28H ; Restore original 8155 control byte EI ; RESTORE interrupts ; MVI B,3CH LDA OLDBAUD ; Restore original baud rate byte CALL IORESET ; Do an 8251 reset ; MVI B,3BH LDA OLDMODE ; Restore original mode byte CALL IORESET ; Do an 8251 reset RET ;..... ; ; IORESET: ; SUBROUTINE WHICH EXECUTES A MASTER RESET FOR 8251. ; 8251 RESET IS A BIOS FUNCTION IN VIXEN EXTENDED BIOS ; ; ENTRY: ; A = BYTE VALUE TO BE REPLACED IN BIOS ; (MODE BYTE OR BAUD RATE BYTE) ; ; B = HEX DISPLACEMENT FROM BASE OF BIOS ; FOR MODE BYTE OR BAUD RATE BYTE ; (MODE BYTE = 3BH) ; (BAUD RATE BYTE = 3CH) ; ; EXIT: ; NONE ; LHLD BIOS ; Find base of BIOS MOV L,B MOV M,A MVI L,36H ; Displacement in BIOS for 8251 reset ; function SHLD EXTFUN CALL BIOSFUNC ; Subroutine call of BIOS 8251 reset ; function RET ;..... ; OLDIOB: DB 0 ; Orig IOBYTE OLDMSC: DB 0 ; Orig misc. ctl byte for 8155 port C OLDVEC: DB 0,0 ; Orig interrupt service vector OLDMODE: DB 1 ; Orig 8251 mode byte from BIOS OLDBAUD: DB 1 ; Orig baud rate byte for 8251 from BIOS BIOSFUNC: DB AJUMP ; Absolute jump to following memory addr EXTFUN: DB 0,0 ; Bios extended function address ; ;----------------------------------------------------------------------- ; ; 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 ; 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: XRA A STA MANUAL ; Reset to maximum auto-speed MVI A,6 MVI B,BD2400 JMP LOADBD ; OK9600: MVI A,8 MVI B,BD9600 JMP LOADBD ; OK19200:MVI A,9 MVI B,BD19200 ; LOADBD: STA MSPEED ; Change time-to-send to match baudrate MOV A,B ; Get baudrate byte MVI B,3CH JMP IORESET ; Used extended BIOS function to reset ;..... ; baud rate on 8251 ; ; ; Table of baudrate parameters ; ; Baudrate table (16 different rates are available) ; BD300 EQU 6 ; 300 baud BD1200 EQU 8 ; 1200 bps BD2400 EQU 11 ; 2400 bps BD4800 EQU 13 ; 4800 bps BD9600 EQU 15 ; 9600 bps BD19200 EQU 16 ; 19200 bps ; BAUDBUF:DB 10,0,0,0,0,0 DB 0,0,0,0,0,0 ; ; end ;----------------------------------------------------------------------- ; ; NOTE: Must terminate by 0400H ; END