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- ; MXH-NA13.ASM -- MEXPLUS overlay for North Star Advantage Ver 1.3 - 86/01/14
-
- VER: EQU 13 ;Version number
-
- ; NOTE: This overlay is designed for use with MEXPLUS (version 1.2 or
- ; greater) but it is fully compatible with the public domain
- ; versions of MEX (version 1.1x)
-
- ; Edit this file for your preferences then follow the "TO USE:" example
- ; shown below.
-
- ; Use the MEX "SET" command to change the baudrate when desired. Use
- ; "SET" to see the current baud rate and "SET xxxx" to set to xxxx. It
- ; starts out at the value specified for the MSPEED equate. To change
- ; the default baud rate, use "SET" to set the desired rate, then "CLONE"
- ; MEX.
-
-
- ; TO USE: First edit this file filling in answers for your own
- ; equipment. Then assemble with ASM.COM or equivalent
- ; assembler.
-
- ; For MEX V 1.1x, use MLOAD (version 2.3 or greater)to
- ; overlay the the results of this program to the
- ; original .COM file:
- ;
- ; A>MLOAD MEX.COM=MEXxxx.COM,[MXO-SMxx,]MXO-NAxx
- ; where MXO-SMxx is an optional modem overlay.
-
- ; For MEXPLUS V 1.2 or greater, use MLOAD to create an overlay
- ; file (.OVR) and boot MEXPLUS and use its built in
- ; LOAD command to install the overlay:
-
- ; A>MLOAD MXH-NA13.OVR=MXH.NA13.HEX
-
- ; Load MEXPLUS and type:
-
- ; [MEX] A0>>LOAD MXH-NA13.OVR
-
- ; = = = = = = = = = = = = = = = = = =
-
- ; 86/01/14 - Version 1.3 - upgraded to MEXPLUS
- ; compatibility - MEXified labels - Ian Cottrell
- ; Sysop
- ; Info Centre BBS
- ; Ottawa, Ontario
- ; Canada
- ; (613)-990-9774
-
- ; 85/09/30 - Version 1.2 - corrected minor bugs - Ian Cottrell
- ; 85/03/27 - Version 1.1 - added ability to change
- ; default baud rate through "CLONE"
- ; command - Ian Cottrell
- ; 84/11/26 - Version 1.0 - MEXified overlay - Ian Cottrell
- ; 84/07/26 - Added default baud rate and slot # - Ian Cottrell
- ; 83/11/11 - Renamed to M7NA-1.ASM, no changes - Irv Hoff
- ; 83/09/14 - Changed M712HZ.ASM TO M712AF.ASM - Robert Lehman
- ; 83/07/27 - Renamed to work with MDM712 - Irv Hoff
- ; 83/02/17 - 1st version of M712HZ.ASM - Irv Hoff
-
- ; = = = = = = = = = = = = = = = = =
-
- YES: EQU 0FFH
- NO: EQU 0
-
- MEXP: EQU YES ; Set to NO for MEX version 1.1x
-
- SLOT: EQU 6 ; Slot used for modem port
- PORT: EQU (6-SLOT)*16 ; Addr for selected slot
- BPORT: EQU PORT+8 ; Baud rate port for Advantage
- DPORT: EQU PORT ; Data port for Advantage
- SPORT: EQU PORT+1 ; Status port for Advantage
- CPORT: EQU PORT+1 ; Control port for Advantage
- DAV: EQU 2 ; Data available
- TBMT: EQU 1 ; Transmit buffer empty
-
- ; MEX Service Processor
-
- MEX: EQU 0D00H ; Address of the service processor
- INMDM: EQU 255 ; Get char from port to A, CY=no more in 100 ms
- TIMER: EQU 254 ; Delay 100ms * reg B
- TMDINP: EQU 253 ; B=# secs to wait for char, cy=no char
- CHEKCC: EQU 252 ; Check for ^C from KBD, Z=present
- SNDRDY: EQU 251 ; Test for modem-send ready
- RCVRDY: EQU 250 ; Test for modem-receive ready
- SNDCHR: EQU 249 ; Send a character to the modem (after sndrdy)
- RCVCHR: EQU 248 ; Recv a char from modem (after rcvrdy)
- LOOKUP: EQU 247 ; Table search: see CMDTBL comments for info
- PARSFN: EQU 246 ; Parse filename from input stream
- BDPARS: EQU 245 ; Parse baud-rate from input stream
- SBLANK: EQU 244 ; Scan input stream to next non-blank
- EVALA: EQU 243 ; Evaluate numeric from input stream
- LKAHED: EQU 242 ; Get nxt char w/o removing from input
- GNC: EQU 241 ; Get char from input, cy=1 if none
- ILP: EQU 240 ; Inline print
- DECOUT: EQU 239 ; Decimal output
- PRBAUD: EQU 238 ; Print baud rate
-
- CONOUT: EQU 2 ; Simulated BDOS function 2: console char out
- PRINT: EQU 9 ; Simulated BDOS function 9: print string
- INBUF: EQU 10 ; Input buffer, same structure as BDOS 10
-
- BELL: EQU 07H ; Bell
- CR: EQU 0DH ; Carriage return
- ESC: EQU 1BH ; Escape
- LF: EQU 0AH ; Linefeed
- RON: EQU 01H ; Reverse video on
- ROFF: EQU 02H ; Reverse video off
-
- ; The Advantage uses the 8251
-
-
- ORG 100H
-
- DB 0C3H ; Show that we're an 8080/Z-80 overlay
- DS 2 ; For rest of the "JMP START" instruction
-
- DS 2 ; Unused by MEX
-
- DB 'P' ; 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 char in terinal
- ; 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
- COLUMS: DB 5 ; Number of DIR columns shown 10AH
- SETFLG: DB YES ; Yes=user-added Setup routine 10BH
- SCRTST: DB YES ; Cursor control routine 10CH
- DS 1 ; Unused by MEX 10DH
- BAKFLG: DB YES ; Yes=change any file same name to .BAK 10EH
- CRCDFL: DB YES ; Yes=default to CRC checking 10FH
- TOGCRC: DB YES ; Yes=allow toggling of CRC to Checksum 110H
- CVTBS: DB NO ; Yes=convert backspace to rub 111H
- TOGLBK: 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)
- TOGLF: DB YES ; Yes=allow toggling of LF after CR 114H
- DB YES ; Yes=allow transmission of logon 115H
- ; write logon sequence at location LOGON
- SAVCCP: DB YES ; Yes=do not overwrite CCP 116H
- DB NO ; Yes=local command if EXTCHR precedes 117H
- ; no=external command if EXTCHR precedes
- DB YES ; Yes=allow toggling of LOCONEXTCHR 118H
- LSTST: DB YES ; Yes=printer available on printer port 119H
- XOFTST: DB YES ; Yes=checks for XOFF from remote while 11AH
- ; sending a file in terminal mode
- XONWT: DB NO ; Yes=wait for XON after CR while 11BH
- ; sending a file in terminal mode
- TOGF: DB YES ; Yes=allow toggling of XOFF checking 11CH
- IGNCTL: DB YES ; Tes=CTL-chars above ^M not displayed 11DH
- EXTRA1: DB 0 ; For future expansion 11EH
- EXITCHR:DB 'E' ; E = Exit to main menu 11FH
- BRKCHR: DB '@' ; @ = Send a 300 ms. break tone 120H
- NOCONN: DB 'N' ; N = Disconnect from the phone line 121H
- LOGCHR: DB 'L' ; L = Send logon 122H
- LSTCHR: DB 'P' ; P = Toggle printer 123H
- UNSAVE: DB 'R' ; R = Close input text buffer 124H
- TRANCHR:DB 'T' ; T = Transmit file to remote 125H
- SAVECHR:DB 'Y' ; Y = Open input text buffer 125H
- EXTCHR: DB '^' ; ^ = Send next character 126H
-
-
- DS 2 ; 128H
-
- INCTL1: IN CPORT ; In modem control port 12AH
- RET
-
- DS 7
-
- OTDATA: OUT DPORT ; Out modem data port 134H
- RET
-
- DS 7
-
- INPORT: IN DPORT ; In modem data port 13EH
- RET
-
- DS 7
-
- MASKR: ANI DAV ; Bit to test for receive ready 148H
- RET
-
- TESTR: CPI DAV ; Value of rcv. bit when ready 14BH
- RET
-
- MASKS: ANI TBMT ; Bit to test for send ready 14EH
- RET
-
- TESTS: CPI TBMT ; Value of send bit when ready 151H
- RET
-
- DCDTST: JMP DCDVEC ; Data carrier detect 154H
- RNGDET: JMP RNGVEC ; Ring detect 157H
-
- DB 0,0,0,0,0 ; Reserved space, assumed 0 15AH
-
- SMDISC: DS 3 ; Smart modem disconnect (not here) 15FH
- DIALV: DS 3 ; DIALV: not done here (maybe MXM-xx) 162H
-
- DISCV: JMP DISCON ; Disconnect modem (with DTR) 165H
- GOODBV: JMP GOODBY ; Call just before exit to CP/M 168H
- INMODV: JMP NITMOD ; Initialize port 16BH
- NEWBDV: JMP NEWBD ; Set new baud rate 16EH
-
- RET ; NOPARV 171H
- NOP
- NOP
-
- RET ; PARITV 174H
- NOP
- NOP
-
- SETUPV: JMP SETCMD ; 177H
-
- DS 3 ; Not used by MEX 17AH
-
- VERSNV: JMP SYSVER ; 17DH
- BREAKV: JMP SBREAK ; 180H
-
- ; Do not change the following line.
-
- DS 18 ; 183H
-
- ; Routines to clear screen and clear to end of screen
- ; If using these routines, set SCRTST to YES at 10AH (above)
-
- CLREOS: LXI D,EOSMSG ; 195H
- MVI C,PRINT
- CALL MEX
- RET
-
- CLS: LXI D,CLSMSG ; 19EH
- JMP CLREOS+3
-
- ; End of fixed area ... from here to 1FFH is reserved
-
- ORG 200H ; New boundary for MEXPLUS
-
- SYSVER: MVI C,ILP
- CALL MEX
-
- IF MEXP
- DB 'MEXPLUS '
- ENDIF ;MEXP
-
- DB 'Version '
- DB VER/10+'0'
- DB '.'
- DB VER MOD 10+'0'
- DB ' for North Star Advantage - Slot ',SLOT+30H
- DB CR,LF
- DB 'Default Baud Rate: ',RON,0
- LDA MSPEED
- MVI C,PRBAUD
- CALL MEX
- MVI C,ILP
- CALL MEX
- DB ROFF
- DB CR,LF,0
- RET
-
- ; Routine called just prior to exit to CP/M
-
- GOODBY: RET
-
- ; Return data carrier detect (DCD) status
- ; 0 = no carrier
- ; 255 = carrier present
- ; 254 = we don't know (DCD not supported)
-
- DCDVEC: MVI A,254 ; Return 'we don't know'
- RET
-
- ; Return ring indicator status
- ; 0 = not ringing
- ; 255 = ring detected
- ; 254 = we don't know (RI not supported)
-
- RNGVEC: MVI A,254 ; Return 'we don't know'
- RET
-
- ; This routine allows a 300 ms. break tone to be send to reset some
- ; time-share computers.
-
- SBREAK: MVI A,08H ;send a break tone for 300 ms.
- JMP DISCON1
-
- ; This routine sends a 300 ms. break tone and sets DTR low for the same
- ; length of time to disconnect some modems such as the Bell 212a, etc.
-
- DISCON: MVI A,0AH ;set break, DTR low
-
- DISCON1:OUT CPORT ;put command register out of mode
- IN SPORT ;make sure it is now clear
- IN SPORT ;try once more
- MVI B,3 ;delay for 300 ms.
- MVI C,TIMER
- CALL MEX
- MVI A,37H ;reset RTS, flags, DTR low, enable R/T
- OUT CPORT ;send to command register
- IN DPORT ;clear any incoming chars.
- IN DPORT ;try once more
- XRA A ;clear the 'A' reg.
- RET
-
- ; The following are used in setting up the modem port.
- ; Since N/S Bios only initializes the first 3 ports, the
- ; 8251 for the selected slot is initialized.
-
- NITMOD: LXI H,NITSTR ; Point to initialization string
- LXI B,5*256+PORT+1 ; B=count, C=UART cmd port
- DB 0EDH,0B3H ; Z-80 OTIR instruction
- LDA MSPEED ; Get MSPEED value
- CALL SBAUD ; Go set baud rate
- JZ NITERR ; If zero, error
- RET ; No error, normal return
-
- NITERR: MVI C,ILP
- CALL MEX
- DB 'Default baud rate not supported',CR,LF
- DB 'Now set to: '
- DB RON,'1200 baud.',ROFF,0
- MVI A,5 ; Set baud rate
- STA MSPEED ; to 1200
- CALL SBAUD ; baud
- RET
-
- NITSTR: DB 80H,80H ; Fillers to ensure known state
- DB 040H ; Internal reset
- DB 04EH ; 1 stop bit, 8 data bits, no parity
- ; 16x clock
- DB 037H ; TX on, RX on, DTR low, RTS low
- ; Reset errors
-
- ; The following changes the baud rate with the set command.
-
- SETCMD: MVI C,SBLANK ;any arguments?
- CALL MEX
- JC TELL ;if not, go display baud rate
- LXI D,CMDTBL
- MVI C,LOOKUP
- CALL MEX ;parse agrument
- PUSH H ;save any arg addrs on stack
- RNC ;if we have one, return to it
- POP H ;oops, input not found in table
- MVI C,ILP
- CALL MEX ;tell user input not valid
- SETERR: DB '++ SET command error ++',CR,LF,BELL,0
- RET
-
- CMDTBL: DB '30','0'+80H
- DW OK300
- DB '60','0'+80H
- DW OK600
- DB '120','0'+80H
- DW OK1200
- DB '240','0'+80H
- DW OK2400
- DB '480','0'+80H
- DW OK4800
- DB '960','0'+80H
- DW OK9600
- DB '1920','0'+80H
- DW OK19200
- DB 0
-
- TELL: MVI C,ILP
- CALL MEX
- DB CR,LF,'Baud rate is now: '
- DB RON,0
- LDA MSPEED
- MVI C,PRBAUD
- CALL MEX
- MVI C,ILP
- CALL MEX
- DB ROFF,0
- RET
-
- OK300: MVI A,1
- JMP LOADBD
-
- OK600: MVI A,3
- JMP LOADBD
-
- OK1200: MVI A,5
- JMP LOADBD
-
- OK2400: MVI A,6
- JMP LOADBD
-
- OK4800: MVI A,7
- JMP LOADBD
-
- OK9600: MVI A,8
- JMP LOADBD
-
- OK19200:MVI A,9
-
- LOADBD: STA MSPEED ; Set xfer time
- CALL SBAUD ; Go set baud rate
- JZ SETERR ; If zero, error
- CALL TELL ; No error, so tell us new rate
- RET
-
- SBAUD: LXI H,BRTBL ; Calculate required value
- MVI D,0 ; to send to baud
- MOV E,A ; rate register
- DAD D
- MOV A,M ; Reg A now contain correct value
- ORA A ; Zero?
- RZ ; If so, error - return with Z set
- OUT BPORT ; Else, send to baud rate port
- IN DPORT ; Clear any incoming chars.
- IN DPORT ; Try once more
- RET
-
- NEWBD: CALL SBAUD ; Go set baud rate
- JZ SETERR ; If Z, error
- RET ; No error, normal return
-
- ; Table of baudrate parameters for N/S SIO board
-
- BRTBL: EQU $
-
- BD110: DB 00H ;110 baud not supported
- BD300: DB 40H
- BD450: DB 00H ;450 baud not supported
- BD600: DB 60H
- BD710: DB 00H ;710 baud not supported
- BD1200: DB 70H
- BD2400: DB 78H
- BD4800: DB 7CH
- BD9600: DB 7EH
- BD19200:DB 7FH
-
- EOSMSG: DB 15,0,0,0,0,'$' ;clear to eos for N/S Advantage
- CLSMSG: DB 30,15,0,0,0,'$' ;clear screen (home and clear eos)
-
- END