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- ; MXH-CPM3.ASM -- MEXP hardware overlay for CP/M Plus.
- ;
- ; This MEXP overlay includes SET and ABAUD routines (for
- ; setting and ; automatically changing baud rates) which
- ; use generic CP/M+ BDOS calls. The SET command also
- ; allows one to switch between any two CP/M+ i/o devices
- ; (called modem and xmodem here). As such, the overlay
- ; can be configured for any CP/M+ system in which the
- ; character i/o device table has been implemented simply
- ; by including the hardware dependent modem and xmodem
- ; port specifications in the tables MODTBL and XMODTBL
- ; at the end of the overlay.
- ;
- ; MXH-CPM3.ASM was derived from the general purpose
- ; overlay file M7GP-1.ASM with baudrate code from
- ; M7C3-1.ASM by R. Saeks - 5/7/85.
- ;
- VERSION: EQU 00H ;Version number
- ;
- BELL: EQU 07H ;bell
- CR: EQU 0DH ;carriage return
- ESC: EQU 1BH ;escape
- LF: EQU 0AH ;linefeed
- YES: EQU 0FFH
- NO: EQU 0
- BDOS: EQU 5
- DUMMY: EQU 0 ;dummy byte to be filled in
- ;by SETPORT with correct data
- ;
- MODFIRST: EQU YES ;yes if modem port at logon
- XMODFIRST: EQU NO ;yes if xmodem port at logon
- ;
- ; The following JUMP instruction is necessary for MEXPLUS
- ; loadable overlays.
- ;
- ORG 100H
- DB 0C3H ; JMP instruction for MEX 1.2
- DS 2 ;(for "JMP START" instruction)
- ;
- ; The following DB statements define the initial MEX parameters.
- ;
- 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 40 ;clock speed in MHz x10, 25.5 MHz max. 106H
- ;20=2 MHh, 37=3.68 MHz, 40=4 MHz, etc.
- MSPEED: DB 5 ;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 YES ;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 YES ;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 NO ;yes=allow transmission of logon 115H
- ;write logon sequence at location LOGON
- SAVCCP: DB NO ;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$MODCTL1: IN 08DH ! RET ;in modem control port 12AH
- DS 7
- OUT$MODDATP: OUT 08CH ! RET ;out modem data port 134H
- DS 7
- IN$MODDATP: IN 08CH ! RET ;in modem data port 13EH
- DS 7
- ANI$MODRCVB: ANI 02H ! RET ;bit to test for receive ready 148H
-
- CPI$MODRCVR: CPI 02H ! RET ;value of rcv. bit when ready 14BH
- ANI$MODSNDB: ANI 04H ! RET ;bit to test for send ready 14EH
- CPI$MODSNDR: CPI 04H ! RET ;value of send bit when ready 151H
- ;
- ; Following are two new entry points for MEXPLUS
- ; DCDTST returns data-carrier detect in A: 0 if no carrier
- ; present, 0FFH if carrier is present, and 0FEH if overlay
- ; doesn't know (i.e., doesn't support carrier detect)
- ; RNGDET works similarly for ring-detect.
- ;
- DCDTST: JMP DCDVEC ;data carrier detect 154H
- RNGDET: JMP RNGVEC ;ring-detect 157H
- ;
- ; End of MEXPLUS added vectors
- ;
- OUT$MODCTL1: OUT 08DH ! RET ;out modem control port #2 15AH
- OUT$MODCTL2: OUT 08DH ! RET ;out modem control port #1 15DH
- ;
- LOGONPTR: DW LOGON ;for user message. 160H
- DS 6 ; 162H
- JMP$GOODBYE: JMP GOODBYE ; 168H
- JMP$INIT: JMP INIT ;go to user written routine 16BH
- JMP$ABAUD: JMP ABAUD ;auto baud rate change 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$ILPRT ;VT-52 change for 195H
- DB ESC,'k',0,0,0 ;your terminal 198H
- RET ; 19DH
- ;
- CLRSCRN: CALL JMP$ILPRT ;VT-52 change for 19EH
- DB ESC,'v',0,0,0 ;your terminal 1A1H
- RET ; 1A6H
-
- ;
- SYSVER: CALL JMP$ILPRT ; 1A7H
- DB 'Version for CP/M Plus'
- DB CR,LF,'Hardware Overlay MXH-CPM3'
- DB VERSION / 10 + ' ',VERSION mod 10 + ' '
- DB CR,LF,0
- RET
- ;.....
- ;
- ;
- ;-----------------------------------------------------------------------
- ;
- ; NOTE: You can change the SYSVER message to be longer or shorter
- ; so long as the maximum length for the overlay is not exceeded.
- ;
- ;-----------------------------------------------------------------------
- ;
- ; You can put in a message at this location which can be called up with
- ; CTL-O if TRANLOGON has been set TRUE. You can use several lines if
- ; desired. End with a 0.
- ;
- LOGON: DB 'How are you today?',CR,LF,0
- ;.....
- ;
- ;
- ; Add your own routine here to send a break tone to reset some time-share
- ; computers, if desired.
- ;
- SENDBRK: RET
- ;.....
- ;
- ;
- ; Add your own routine here to put DTR low and/or send a break tone.
- ;
- GOODBYE: RET
- ;.....
- ;
- ; return data carrier detect status
- ; 0 = no carrier
- ; 255 = carrier present
- ; 254 = we don't know (DCD not supported)
- ;
- DCDVEC: MVI A,0FEH ;return 255 if carrier detect
- RET
- ;......
- ;
- ; return ring-detect status:
- ;
- ; 0 = not ringing
- ; 255 = ring detected
- ; 254 = we don't know
- ;
- RNGVEC: MVI A,0FEH ;return "we don't know"
- RET
- ;
- ;
- ;
- ; You can use this area for any special initialization or setup you may
- ; wish to include. Each must stop with a RET. You can check the other
- ; available overlays for ideas how to write your own routines if that
- ; may be of some help.
- ;
- INIT: MVI C,12 ;routine to check if CP/M+
- CALL BDOS ;Get version #
- CPI 30H
- JNC INITPORT ;jump if CP/M+
- CALL JMP$ILPRT ;return error message if not CP/M+
- DB 'Requires CP/M Version 3',CR,LF,0
- RST 0
-
- INITPORT: MVI A,3EH
- OUT 9DH
- MVI A,27H
- OUT 8DH
- RET
- ;
- ; Routine to automatically set baud rate from data stored
- ; in phone directory
- ;
- ABAUD: PUSH H ;don't alter anybody
- PUSH D
- PUSH B
- CPI 1 ;check if 300 baud
- JZ OK300
- CPI 5 ;check if 1200 baud
- JZ OK1200
- CPI 6 ;check if 2400 baud
- JZ OK2400
- CPI 7 ;check if 4800 baud
- JZ OK4800
- CPI 8 ;check if 9600 baud
- JZ OK9600
- STC ;return error for STBAUD caller
- JMP SETEXIT ;restore BC, DE and HL regs
- ;
- ; Routine to set baud rate from command line input
- ;
- SETUPR: PUSH H ;don't alter anybody
- PUSH D
- PUSH B
- SETUPR1: CALL JMP$ILPRT ;display SET message
- DB CR,LF,' Input Baud Rate or Port'
- DB CR,LF,'<300, 1200, 2400, 4800, 9600,'
- DB ' (M)odem, or (X)modem>: ',0
- LXI D,SETBUF
- CALL JMP$INBUF ;input command
- LXI D,SETBUF+2
- CALL JMP$INLNCOMP
- DB '300',0 ;check if 300 baud
- JNC OK300
- CALL JMP$INLNCOMP
- DB '1200',0 ;check if 1200 baud
- JNC OK1200
- CALL JMP$INLNCOMP
- DB '2400',0 ;check if 2400 baud
- JNC OK2400
- CALL JMP$INLNCOMP
- DB '4800',0 ;check if 4800 baud
- JNC OK4800
- CALL JMP$INLNCOMP
- DB '9600',0 ;check if 9600 baud
- JNC OK9600
- CALL JMP$INLNCOMP
- DB 'M',0 ;check if Modem port
- JNC SETMOD
- CALL JMP$INLNCOMP
- DB 'm',0
- JNC SETMOD
- CALL JMP$INLNCOMP
- DB 'X',0 ;check if Xmodem port
- JNC SETXMOD
- CALL JMP$INLNCOMP
- DB 'x',0
- JNC SETXMOD
- CALL JMP$ILPRT
- DB ' ++ Incorrect entry ++',CR,LF,BELL,0
- JMP SETUPR1 ;repeate if incorrect entry
-
-
- SETMOD: LXI H,MODTBL ;load modem port equate table
- CALL SETPORT ;set MODTBL equates in DUMMY bytes
- JMP SETEXIT ;restore BC, DE, and HL regs
-
- SETXMOD: LXI H,XMODTBL ;load xmodem port equate table
- CALL SETPORT ;set XMODTBL equates in DUMMY bytes
- JMP SETEXIT ;restore BC, DE, and HL regs
- ;
- ;subroutine to insert port addresses and masks into DUMMY
- ;bytes in mex I/O subroutines. Routine enters with the
- ;address of the port data table in reg hl.
- ;
-
- SETPORT:
- MOV A,M ;get modem control port
- STA IN$MODCTL1+1
- STA OUT$MODCTL1+1
- STA OUT$MODCTL2+1
- INX H ;get modem data port
- MOV A,M
- STA OUT$MODDATP+1
- STA IN$MODDATP+1
- INX H ;get carrier detact bit
- MOV A,M
- STA DCDVEC+5
- INX H ;get receive ready bit
- MOV A,M
- STA ANI$MODRCVB+1
- INX H ;get receive ready mask
- MOV A,M
- STA CPI$MODRCVR+1
- INX H ;get trans ready bit
- MOV A,M
- STA ANI$MODSNDB+1
- INX H ;get trans ready mask
- MOV A,M
- STA CPI$MODSNDR+1
- INX H ;get CPM3 device number
- MOV A,M
- STA DEVICE
- ;
- ;routine to compute the address of baudrate parameter
- ;in the CPM3 char i/o device table for the specified device.
- ;
-
- ADCHRTBL: MVI A,20 ;BIOS call to return character I/O
- STA FUNC ;device table address
- MVI C,50 ;cp/m+ direct BIOS call
- LXI D,FUNC ;direct BIOS call data structure
- CALL BDOS
- PUSH H ;Save the table address
- LXI H,7 ;Offset to baudrate
- LDA DEVICE
- ORA A
- JZ ISZERO ;jump if cp/m+ i/o device # 0
- LXI D,8
-
- DEVLP: DAD D ;add (8xDEV #) to baudrate offset
- DCR A
- JNZ DEVLP
-
- ISZERO: POP D ;Get Table address
- DAD D ;Form baudrate address
- SHLD BAUDAD ;save baudrate address for DEV #
- RET
- ;
- ;subroutines to load mspeed and cp/m+ baudrate codes
- ;
- ;baudrate mspeed cpm3
- OK300: MVI A,1 ;300 baud ; code code
- MVI B,6 ;-----------------------
- JMP LOADBD ;300 1 6
- ;600 3 7
- OK1200: MVI A,5 ;1200 baud ;1200 5 8
- MVI B,8 ;2400 6 10
- JMP LOADBD ;4800 7 12
- ;9600 8 14
- OK2400 MVI A,6 ;2400 baud ;19200 9 15
- MVI B,10
- JMP LOADBD
-
- OK4800 MVI A,7 ;4800 baud
- MVI B,12
- JMP LOADBD
-
- OK9600 MVI A,8 ;9600 baud
- MVI B,14 ;fall through to LOADBD
- ;
- ;routine to store mspeed baudrate code (reg a) in MSPEED and
- ;cp/m+ baudrate code (reg b) at (BAUDAD) in i/o device table
- ;and to reset the i/o port to the new baudrate.
- ;
-
- LOADBD: STA MSPEED ;store mspeed
- LHLD BAUDAD ;set CPM3 char table
- MOV M,B
- LDA DEVICE ;reset device
- MOV L,A ;store cp/m+ device number
- MVI H,0 ;in "reg c" of direct BIOS
- SHLD BCREG ;data structure
- MVI A,21 ;device init BIOS call
- STA FUNC
- MVI C,50 ;cp/m+ direct BIOS call
- LXI D,FUNC ;direct BIOS call data structure
- CALL BDOS
- SETEXIT: POP B ;restore BC, DE, and HL regs
- POP D
- POP H
- RET
- ;
- DEVICE: DB DUMMY ;storage for cp/m+ device number
- SETBUF: DB 10,0
- DS 2
-
- FUNC: DS 1 ;cp/m+ direct BIOS call
- AREG: DS 1 ;data structure
- BCREG: DS 2
- DEREG: DS 2
- HLREG: DS 2
- BAUDAD: DS 2 ;storage for baudrate address
- ;in char i/o device table
- ;
- ;Equates for Modem port (set for CompuPro Interfacer 4)
- ;
- MODBASE: EQU 08CH
- ;
- MODTBL:
- DB MODBASE+1 ;modem control/status port
- DB MODBASE ;modem data port
- DB 040H ;mask for carrier detect bit
- DB 02H ;mask to test for receive
- DB 02H ;value when receive ready
- DB 04H ;mask to test for send
- DB 04H ;value when ready to send
- DB 8 ;cp/m+ device number
- ;
- ;Equates for Xmodem port (set for Zilog DART)
- ;
- XMODBASE: EQU 08CH
- ;
- XMODTBL:
- DB XMODBASE+1 ;modem control/status port
- DB XMODBASE ;modem data port
- DB 040H ;mask carrier detect bit
- DB 02H ;mask to test for receive
- DB 02H ;value when receive ready
- DB 04H ;mask to test for send
- DB 04H ;value when ready to send
- DB 9 ;cp/m+ device number
- ;
- ; If using the Hayes Smartmodem this is unavailable without a special
- ; change.
- ;
- SPCLMENU: RET
- ;
- ;
- ;.....
- ;
- END
- ;
- tructure
- BCREG: DS 2
- DEREG: DS 2
- HLREG: DS 2
- BAUDAD: DS 2 ;storage for baudrate addr