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Assembly Source File | 1994-07-13 | 12.9 KB | 373 lines

; M7US-1.ASM -- U.S. Robotics S-100 overlay for MDM7xx. 12/21/83 ; ; This overlay adapts the MDM7xx program to the U.S. Robotics S-100 ; autodial modem. ; ; 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 overlay is capable of setting the baud rate and sending breaks. ; Although disconnecting the modem is not supported (by use of a function ; to lower DTR), the control-N command still works, as it uses "+++" ; which causes the U.S.R. S-100 modem to hang up. If you are running a ; system which has a clock speed of more than 4 MHz, be sure to see ; the routine INITMOD, as you will have to "uncomment" some do-nothing ; time wasting statements to slow your computer down for the modem. ; ; ; TO USE: First edit this file filling in answers for your own ; equipment. Then assemble with ASM.COM or equivalent ; assembler. Then use DDT to overlay the the results ; of this program to the original .COM file: ; ; A>DDT MDM7xx.COM ; DDT VERS 2.2 ; NEXT PC ; 4300 0100 ; -IM7US-1.HEX (note the "I" command) ; -R ("R" loads in the .HEX file) ; NEXT PC ; 4300 0000 ; -G0 (return to CP/M) ; A>SAVE 66 MDM7xx.COM (now have a modified .COM file) ; ; = = = = = = = = = = = = = = = = = = ; ; 12/21/83 - Added "commented" delays in init- ; ialization for fast systems. - Phil Lapsley ; 12/19/83 - Now sends AT command in the ; initialization routine to get ; the attention of the USR S-100 - Phil Lapsley ; 12/17/83 - Created from M7GP-1.ASM - Phil Lapsley ; 11/11/83 - Renamed to M7GP-1.ASM, no changes - Irv Hoff ; 07/27/83 - Renamed to work with MDM712 - Irv Hoff ; 07/01/83 - Revised to work with MDM711 - Irv Hoff ; 07/01/83 - Revised to work with MDM710 - Irv Hoff ; 05/27/83 - Updated to work with MDM709 - Irv Hoff ; 05/15/83 - Revised to work with MDM708 - Irv Hoff ; 04/11/83 - Updated to work with MDM707 - Irv Hoff ; 04/04/83 - First version of this file - Irv Hoff ; ; = = = = = = = = = = = = = = = = = ; BELL: EQU 07H ;bell CR: EQU 0DH ;carriage return ESC: EQU 1BH ;escape LF: EQU 0AH ;linefeed ; YES: EQU 0FFH NO: EQU 0 ; ; ; Change the following information to match your equipment ; PORT: EQU 000H MODCTL1: EQU PORT+1 ;MODEM CONTROL PORT MODDATP: EQU PORT ;MODEM DATA IN PORT MODDATO: EQU PORT ;MODEM DATA OUT PORT MODDCDB: EQU 080H ;CARRIER DETECT BIT MODDCDA: EQU 080H ;VALUE WHEN ACTIVE MODRCVB: EQU 2 ;BIT TO TEST FOR RECEIVE MODRCVR: EQU 2 ;VALUE WHEN READY MODSNDB: EQU 1 ;BIT TO TEST FOR SEND MODSNDR: EQU 1 ;VALUE WHEN READY ; ORG 100H ; ; ; Change the clock speed to suit your system ; DS 3 ;(for "JMP START" instruction) ; PMMIMODEM: DB NO ;yes=PMMI S-100 Modem 103H SMARTMODEM: DB YES ;yes=HAYES Smartmodem, no=non-PMMI 104H TOUCHPULSE: DB 'T' ;T=touch, P=pulse (Smartmodem-only) 105H CLOCK: DB 50 ;clock speed in MHz x10, 25.5 MHz max. 106H ;20=2 MHh, 37=3.68 MHz, 40=4 MHz, etc. MSPEED: DB 1 ;0=110 1=300 2=450 3=600 4=710 5=1200 107H ;6=2400 7=4800 8=9600 9=19200 default BYTDLY: DB 5 ;0=0 delay 1=10ms 5=50 ms - 9=90 ms 108H ;default time to send character in ter- ;minal mode file transfer for slow BBS. CRDLY: DB 5 ;0=0 delay 1=100 ms 5=500 ms - 9=900 ms 109H ;default time for extra wait after CRLF ;in terminal mode file transfer NOOFCOL: DB 5 ;number of DIR columns shown 10AH SETUPTST: DB YES ;yes=user-added Setup routine 10BH SCRNTEST: DB NO ;Cursor control routine 10CH ACKNAK: DB YES ;yes=resend a record after any non-ACK 10DH ;no=resend a record after a valid-NAK BAKUPBYTE: DB NO ;yes=change any file same name to .BAK 10EH CRCDFLT: DB YES ;yes=default to CRC checking 10FH TOGGLECRC: DB YES ;yes=allow toggling of CRC to Checksum 110H CONVBKSP: DB NO ;yes=convert backspace to rub 111H TOGGLEBK: DB YES ;yes=allow toggling of bksp to rub 112H ADDLF: DB NO ;no=no LF after CR to send file in 113H ;terminal mode (added by remote echo) TOGGLELF: DB YES ;yes=allow toggling of LF after CR 114H TRANLOGON: DB YES ;yes=allow transmission of logon 115H ;write logon sequence at location LOGON SAVCCP: DB YES ;yes=do not overwrite CCP 116H LOCONEXTCHR: DB NO ;yes=local command if EXTCHR precedes 117H ;no=external command if EXTCHR precedes TOGGLELOC: DB YES ;yes=allow toggling of LOCONEXTCHR 118H LSTTST: DB YES ;yes=printer available on printer port 119H XOFFTST: DB NO ;yes=checks for XOFF from remote while 11AH ;sending a file in terminal mode XONWAIT: DB NO ;yes=wait for XON after CR while 11BH ;sending a file in terminal mode TOGXOFF: DB YES ;yes=allow toggling of XOFF checking 11CH IGNORCTL: DB YES ;yes=CTL-chars above ^M not displayed 11DH EXTRA1: DB 0 ;for future expansion 11EH EXTRA2: DB 0 ;for future expansion 11FH BRKCHR: DB '@'-40H ;^@ = Send 300 ms. break tone 120H NOCONNCT: DB 'N'-40H ;^N = Disconnect from the phone line 121H LOGCHR: DB 'L'-40H ;^L = Send logon 122H LSTCHR: DB 'P'-40H ;^P = Toggle printer 123H UNSAVE: DB 'R'-40H ;^R = Close input text buffer 124H TRANCHR: DB 'T'-40H ;^T = Transmit file to remote 125H SAVECHR: DB 'Y'-40H ;^Y = Open input text buffer 126H EXTCHR: DB '^'-40H ;^^ = Send next character 127H ; ; DS 2 ; 128H ; IN$MODCTL1: IN MODCTL1 ! RET ;in modem control port 12AH DS 7 OUT$MODDATP: OUT MODDATP ! RET ;out modem data port 134H DS 7 IN$MODDATP: IN MODDATP ! RET ;in modem data port 13EH DS 7 ANI$MODRCVB: ANI MODRCVB ! RET ;bit to test for receive ready 148H CPI$MODRCVR: CPI MODRCVR ! RET ;value of rcv. bit when ready 14BH ANI$MODSNDB: ANI MODSNDB ! RET ;bit to test for send ready 14EH CPI$MODSNDR: CPI MODSNDR ! RET ;value of send bit when ready 151H DS 6 ; 156H ; OUT$MODCTL1: OUT MODCTL1 ! RET ;out modem control port #1 15AH OUT$MODCTL2: RET ! NOP ! NOP ;ctl-port #2 is not used 15DH ; LOGONPTR: DW LOGON ;for user message. 160H DS 6 ; 162H JMP$GOODBYE: JMP GOODBYE ; 168H JMP$INITMOD: JMP INITMOD ;go to user written routine 16BH RET ! NOP ! NOP ;(by-passes PMMI routine) 16EH RET ! NOP ! NOP ;(by-passes PMMI routine) 171H RET ! NOP ! NOP ;(by-passes PMMI routine) 174H JMP$SETUPR: JMP SETUPR ; 177H JMP$SPCLMENU: JMP SPCLMENU ; 17AH JMP$SYSVER: JMP SYSVER ; 17DH JMP$BREAK: JMP SENDBRK ; 180H ; ; ; Do not change the following six lines. ; JMP$ILPRT: DS 3 ; 183H JMP$INBUF DS 3 ; 186H JMP$INLNCOMP: DS 3 ; 189H JMP$INMODEM DS 3 ; 18CH JMP$NXTSCRN: DS 3 ; 18FH JMP$TIMER DS 3 ; 192H ; ; ; Routine to clear to end of screen. If using CLREOS and CLRSCRN, set ; SCRNTEST to YES at 010AH (above). ; CLREOS: CALL JMP$ILPRT ; 195H DB 0,0,0,0,0 ; 198H RET ; 19DH ; CLRSCRN: CALL JMP$ILPRT ; 19EH DB 0,0,0,0,0 ; 1A1H RET ; 1A6H ; SYSVER: CALL JMP$ILPRT ; 1A7H DB 'Version for U.S.R. S-100 autodial' 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) if using the Hayes Smartmodem ; or by address 0C00H (2659 bytes) otherwise. ; ;----------------------------------------------------------------------- ; ; You can put in a message at this location which can be called up with ; CTL-O if TRANLOGON has been set TRUE. You can use several lines if ; desired. End with a 0. ; LOGON: DB 'How are you today?',CR,LF,0 ;..... ; ; ; The following routine sends a break "character" to the remote ; computer for 300 ms. The "MSPEED" value is needed to decide whether ; or not the modem is at 300, 600, or 1200 baud. The routine must ; know this because U.S.R. set up the RTS bit of the command resgister ; as a baud rate selection bit, and this routine must be careful not ; to change it, or the user will end up at a different baud rate ; after the break "character" is sent. Note that the "MVI A, 01FH" does ; not change any flags. ; SENDBRK: LDA MSPEED ; Get speed byte CPI 3 ; Are we at 600 baud? MVI A, 01FH ; Set up for 600 (no flag changes) JZ SBRK2 ; And if we are, go do that MVI A, 03FH ; Otherwise, set up for 300/1200 SBRK2: OUT MODCTL1 ; Send break PUSH PSW ; Save value MVI B, 3 ; 300 ms delay value CALL JMP$TIMER ; Wait that long POP PSW ; Restore command byte ANI 0F7H ; Turn off break bit OUT MODCTL1 ; Send command byte to UART RET ;..... ; ; ; The U.S.R. S-100 does not have a "quick-disconnect" feature like ; the Hayes does (by lowering DTR). Therefore, "GOODBYE" is not ; implemented. Yet control-N still works to hang up (see note ; above in introduction) ; GOODBYE: RET ;..... ; ; ; You can use this area for any special initialization or setup you may ; wish to include. Each must stop with a RET. This initialization ; sets up 300 baud, 8 data bits, 1 stop bit, no parity. Due to a ; quirk in the U.S.R. S-100 (it seems to have plenty of 'em), after ; you change baud rates, you should send an "AT" followed by a ; carriage return. Therefore, this is done after every initialization ; when there is no carrier present. ; ; NOTE: The U.S.R. S-100 does not operate too well at clock speeds of ; over 4 MHz. If you are running at that speed or higher, you ; should uncomment (by removing the preceding semicolon) the ; lines with XCHG. These serve as time wasting routines to ; let the U.S.R. S-100 catch up. This is not a problem when ; doing character I/O, as the program checks to see if the ; modem is ready to accept a character. ; INITMOD: XRA A ; Zero accumulator OUT MODCTL1 ; Clear 8251A ; XCHG ; For fast systems ; XCHG ; For fast systems OUT MODCTL1 ; Twice ; XCHG ; For fast systems ; XCHG ; For fast systems OUT MODCTL1 ; Three times, even ; XCHG ; For fast systems ; XCHG ; For fast systems MVI A, 040H ; Reset UART command OUT MODCTL1 ; XCHG ; For fast systems ; XCHG ; For fast systems MODEBT: MVI A, 04FH ; 8 bits, 1 stop, no parity OUT MODCTL1 ; XCHG ; For fast systems ; XCHG ; For fast systems CMDBT: MVI A, 037H ; On hook, Tx/Rx enable, reset errs OUT MODCTL1 ; XCHG ; For fast systems ; XCHG ; For fast systems BDCODE: MVI A, 1 ; 300 baud code STA MSPEED IN MODCTL1 ; Get the current status ANI MODDCDB ; See if there is a carrier RNZ ; If so, don't do AT stuff MVI B, 1 ; 100 ms CALL JMP$TIMER ; Wait that long for things to settle MVI B, 'A' ; "A" of AT command CALL OUTMOD ; Output to the modem MVI B, 'T' ; "T" of AT command CALL OUTMOD ; Output MVI B, CR ; Followed by a carriage return CALL OUTMOD ; Output that too RET ; ; Output a character to the U.S.R. S-100 ; (NOTE: This routine is not normally present in most overlays, ; and is used by the INITMOD routine above.) ; OUTMOD IN MODCTL1 ; Get status ANI MODSNDB ; Mask for ready status JZ OUTMOD ; Loop if not ready MOV A, B ; Otherwise get the character OUT MODDATP ; Output to the data port RET ; And return ; ; This routine prompts the user for a new baud rate ; (on the U.S.R. this can be 300, 600, or 1200, as mdm7xx ; has no provision for 150 baud) and sets the modem to that ; baud rate. ; SETUPR: LXI D, BAUDBUF ; Point to new input buffer CALL JMP$ILPRT ; Print following line: DB 'Input baud rate (300, 600, 1200): ', 0 CALL JMP$INBUF ; Get a line into the buffer LXI D, BAUDBUF + 2 ; compare BAUDBUF+2 with characters CALL JMP$INLNCOMP DB '300', 0 JNC OK300 CALL JMP$INLNCOMP DB '600', 0 JNC OK600 CALL JMP$INLNCOMP DB '1200', 0 JNC OK1200 CALL JMP$ILPRT DB '++ Incorrect entry ++', CR, LF, BELL, 0 JMP SETUPR ; Try again ; OK300: LXI B, BD300 ; Point to intializers for 300 baud MVI A, 1 ; 300 baud value JMP LOADBD ; Go load it ; OK600: LXI B, BD600 MVI A, 3 JMP LOADBD ; OK1200: LXI B, BD1200 MVI A, 5 ; LOADBD: STA BDCODE + 1 ; Change baud rate code value LDAX B ; Get mode byte value STA MODEBT + 1 ; Change mode byte INX B ; Point to cmd byte LDAX B ; Get cmd byte STA CMDBT + 1 ; Change cmd byte JMP INITMOD ; (Re)initialize modem ; ; Baudrate parameters (mode byte, command byte) ; All values give 8 data bits, 1 stop bit, no parity. ; BD300: DB 04FH, 037H ; 300 baud BD600: DB 04EH, 017H ; 600 baud BD1200: DB 04EH, 037H ; 1200 baud ; BAUDBUF: DB 10, 0 DS 10 ; ; If using the Hayes Smartmodem this is unavailable without a special ; change. ; SPCLMENU: RET ; ; ; NOTE: MUST TERMINATE PRIOR TO 0400H (with Smartmodem) ; 0C00H (without Smartmodem) ;..... ; END ;