CP/M

home *** CD-ROM | disk | FTP | other *** search

/ CP/M / CPM_CDROM.iso / jsage / znode3 / modem / i2vi-3.asm < prev next >

Wrap

Assembly Source File | 1994-09-02 | 15.5 KB | 544 lines

; I2VI-3.ASM - Visual 1050 computer overlay for IMP - 12/01/87 ; ; = = = = = = = = = = = = = = = = = ; ; Interrupt vectors ; int$port equ 0C0h int$initial equ 010h int$mask equ 1110$1111b ; All on except VERT all$ints equ 1111$1111b ; All interrupts enabled vert$clear equ 0A0h ; Clear vert interrupt ; ; RS-232 8251 ; p$aux1$data equ 8Ch ; rs-232 xmit/recv data p$aux1$control equ 8Dh ; rs-232 control/status ; ; Miscellaneous 8255 p$printer equ 91h ; printer bits p$misc equ 92h ; miscellaneous bits p$8255$control equ 93h ; 8255 control port ; ; Lpt masks ; misc$lpt$strobe equ 0000$0001b ; handshake strobe misc$lpt$avail equ 0010$0000b ; lpt available misc$lpt$nobusy equ 0001$0000b ; finished printing ; equates for mode byte bit fields ; mb$input equ 0000$0001b ; device may do input mb$output equ 0000$0010b ; device may do output mb$in$out equ mb$input+mb$output ; mb$soft$baud equ 0000$0100b ; software selectable ; ; baud rates ; mb$serial equ 0000$1000b ; device may use protocol mb$xon$xoff equ 0001$0000b ; XON/XOFF protocol ; ; enabled ; port c base baud rate definitions ; misc$base01200 equ 0000$0000b ; port c 1200 baud misc$base02400 equ 0000$0100b ; port c 2400 baud misc$base19200 equ 0000$1000b ; port c 19200 baud misc$base09600 equ 0000$1100b ; port c 9600 baud misc$baudmask equ 0000$1100b ; mask for port c base baud rate mode$div16 equ 0000$0010b ; 16x baud rate factor mode$div64 equ 0000$0011b ; 64x baud rate factor ; baud$300 equ misc$base01200 or mode$div64 ; 300 baud baud$600 equ misc$base02400 or mode$div64 ; 600 baud baud$1200 equ misc$base01200 or mode$div16 ; 1200 baud baud$2400 equ misc$base02400 or mode$div16 ; 2400 baud baud$4800 equ misc$base19200 or mode$div64 ; 4800 baud baud$9600 equ misc$base09600 or mode$div16 ; 9600 baud baud$19200 equ misc$base19200 or mode$div16 ; 19.2k baud ; ; 8251 Modes ; mode$s2 equ 1000$0000b ; stop bit high mode$s1 equ 0100$0000b ; stop bit low mode$ep equ 0010$0000b ; even parity mode$pen equ 0001$0000b ; parity enable mode$12 equ 0000$1000b ; char length high mode$11 equ 0000$0100b ; char length low mode$b2 equ 0000$0010b ; baud rate factor high mode$b1 equ 0000$0001b ; baud rate factor low com$eh equ 1000$0000b ; enter hunt mode com$ir equ 0100$0000b ; internal reset com$rts equ 0010$0000b ; request to send com$er equ 0001$0000b ; error reset com$sbrk equ 0000$1000b ; send break com$rxe equ 0000$0100b ; receive enable com$dtr equ 0000$0010b ; data terminal ready com$txe equ 0000$0001b ; transmit enable ; ; some common values ; mode$eight equ 0000$1100b ; eight data bits mode$onestop equ 0100$0000b ; one stop bit mode$baudmask equ 0000$0011b ; to get baud bits from port c mode$default equ mode$onestop or mode$eight or mode$div16 ; one stop, eight data, no parity, 16x com$default equ com$rts or com$rxe ; request to send and receive enable ; ; Miscellaneous 8255 lpt$mode0 equ 088H ; Mode:A=0&OT, CH=IN, B=0&OT, c=OT lpt$baud equ 0000$1100b ; 1200 baud ; ; YES EQU 0FFH NO EQU 0 ; PORT EQU 08CH ; Visual 8251A serial base port 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 ; BRPORT EQU 92H ; Port for setting baud rate ; MDMODE EQU 82H ; Insures 8251A 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, RCV, DTR, TX ready ; ; ;----------------------------------------------------------------------- ; 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 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 0CH ; 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 'P' ; 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 '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 BRKCHR: DB 'Q' ; Send a break tone 11DH NODTR: DB NO ; Yes if no DTR and need ATH0 to disconnect 11EH ;..... ; ; ; Handles in/out ports for data and status ; I$MDCTL1: IN MDCTL1 ; 11FH RET ; Spares if needed 121H DB 0,0,0,0,0,0,0 ; Spares if needed 122H ; I$MDTXE: IN MDCTL1 ; (Needed for SIO or DART register 1 129H RET ; 12BH DB 0,0,0,0,0,0,0 ; 12CH ; I$MDDATP: JMP BDOS3 ; 133H DB 0,0,0,0 ; 136H DB 0,0,0 ; 13AH ; O$MDDATP: JMP BDOS4 ; 13DH DB 0,0,0,0 ; OUT modem data port 140H DB 0,0,0 ; Spares if needed 144H ;..... ; ; A$MDRCV: JMP BDOS7 ;ANI MDRCV 147H ;RET 149H ; C$MDRCV: JMP BDOS7 ;CPI MDRCV 14AH ;RET 14CH ; A$MDSND: JMP BDOS8 ;ANI MDSND 14DH ;RET 14FH ; C$MDSND: JMP BDOS8 ;CPI MDSND 150H ;RET 152H ; A$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$TIMER: DS 3 ; .1 second timer (amount in 'B' reg.) 192H J$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 1bh,'[4m','Version for Visual 1050 Computer' ; 1AAH DB 1bh,'[m',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 'Hello... ',CR,0 ;..... ; ; ;----------------------------------------------------------------------- ; ; This routine sets a 300 ms break tone ; SENDBRK: MVI A,3FH ; DTR normal, send break tone JMP GOODBYE+2 ;..... ; ; ; This routine sets DTR low for 300 ms to disonnect the phone ; GOODBYE: 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$TIMER MVI A,17h ; Normal send/receive with DTR CALL SETMCTL ; Send to status port RET ;..... ; ; ; Visual initialization -- sets the 8251A for 8 bits, 1 stop pulse, ; DTR high, requires jumper to be set internally to 1200 baud then ; divides by 64 for 300, or by 16 for 1200 baud via "SET" command. Set ; at present to default to 300 baud. ; INITMOD:MVI A,3FH ; Get byte to enable interrupts OUT 09DH ; Turn on interrupts ; ; ; The Visual 1050 provides a special function which returns the ; address of the byte where the BIOS keeps the current value of ; the modem control register. We must modify this byte whenever ; we change the value of this register, or the BIOS will clobber ; it whenever it gets an interrupt from the modem port. ; LXI D,BIOSPB ; Parameter block for BIOS call MVI C,50 ; Bdos function for direct BIOS call CALL 5 SHLD RSPAR ; Save the returned address RET ; MVI A,MDMODE ; Insure 8251 is out of mode OUT MDCTL1 XTHL ; Small delay to complete command XTHL MVI A,MDRSET ; Reset the 8251A for new command OUT MDCTL1 XTHL ; Small delay to complete command XTHL MVI A,MDSET1 ; Set stop pulse, no parity 8 bits, x16 OUT MDCTL1 XTHL ; Small delay to complete command XTHL MVI A,MDCOM ; Error reset, RCV, DTR, TX ready OUT MDCTL1 XTHL ; Small delay to complete command XTHL ; LDA MSPEED ; Get the selected value CPI 1 ; 300 bps JZ OK300 CPI 5 ; 1200 bps JZ OK1200 CPI 6 ; 2400 bps JZ OK2400 CPI 8 ; 9600 bps JZ OK9600 JMP STUPR1 ; Else ask what is wanted ;..... ; ; STUPR: CALL J$CMDSPL ; Gives us CMDBUF+6 JNC STUPR2 ; STUPR1: CALL J$ILPRT DB 'Input Baud Rate (300, 1200, 2400, 9600, 19200): ',0 LXI D,BAUDBUF ; Point to new input buffer CALL J$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 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 ; 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 baud rate MOV A,L ; Get baudrate byte STA LOAD1+1 ; Send to timer for new baudrate MOV A,H OUT MDCTL1 ; Modem status port (mode word) MVI A,17h ;MDCOM DTR, RCV, XMT, error reset CALL SETMCTL ; Modem status port IN BRPORT ; Get what was there ANI 0F3H ; Clear out the old baud rates ; LOAD1: ORI 0 ; Set new baudrate OUT BRPORT ; New baud rate now set RET ;..... ; ; ; Table of baudrate parameters ; BD300 EQU baud$300 ;4F00H 4F divides by 64 BD1200 EQU baud$1200 ;4E00H 4E divides by 16 BD2400 EQU baud$2400 ;4E04H BD9600 EQU baud$9600 ;4E08H BD19200 EQU baud$19200 ;4E10H ; BAUDBUF:DB 10,0,0,0,0,0 DB 0,0,0,0,0,0 ;..... ; ; BIOSPB: DB 30,3 ;..... ; ; ; 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,7 ; Bdos function number JMP BDOS78 ; Common routine for BDOS 7 and 8 ;..... ; ; ; Check for output character (send ready) ; BDOS8: PUSH B ; Save the registers MVI C,8 ; BDOS function number ; BDOS78: PUSH D PUSH H CALL 5 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,3 ; Bdos function number CALL 5 POP H ; Restore the registers POP D POP B RET ; Input character is in a ;..... ; ; ; Ouput a character to modem via BIOS ring buffer ; BDOS4: PUSH B ; Save the registers PUSH D PUSH H MVI C,4 ; BDOS function number MOV E,A ; Character to output must be in 'E' CALL 5 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 whenever 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 ;..... ; ; RSPAR: DS 2 ; Addr of BIOS copy of modem control reg ;..... ; ; end ;----------------------------------------------------------------------- ; ; NOTE: Must terminate by 0400H ; END