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- ; B3CC-2.INS - BYE3 insert for CCS-2719 and SDS Z80-SIO - 07/30/85
- ;
- ; Z80-SIO and 8430 CTC timer
- ;
- ; This version is for both the CCS-2719 and Sierra Data Science S-100
- ; serial I/O boards. Note: This is an insert, not an overlay.
- ;
- ; In order to use the CCS-2719 with the Smartmodem, we must
- ; change the hardware somewhat. The header block on the 2719
- ; must be turned over so the port configuration is for DTE
- ; (DATA TERMINAL EQUIPMENT). Further, the standard CCS-2719
- ; presents DSR from the DB25 to DCD of the SIO. Bye3 requires
- ; the actual DCD from pin 8 of the DB25, Therefore we must
- ; remove the jumper in the header block from pins 1 and 15 and add
- ; a wire from pin 15 of the flat cable header. (Pin 8 of the DB25)
- ; to pin 1 of the header block. This will put the modem's DCD signal
- ; to the SIO's DCD input. Refer to the CCS-2719 schematic in your user's
- ; manual. - Joe Wright
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; Select one of the following with YES or NO
- ;
- CCS EQU YES ; CCS2719 at 3.6864 MHz for Counter mode
- SIERRA EQU NO ; Sierra Data Science at 4.000 MHz
- ;
- ; Set base port for SIO & CTC chips
- ;
- IF CCS
- DPORT EQU 54H ; Data port
- SPORT EQU DPORT+1 ; Modem satus port
- BRPORT EQU 50H ; Baud rate generator port (CTC)
- ENDIF ; CCS
- ;
- IF SIERRA
- DPORT EQU 82H ; Data port
- SPORT EQU DPORT+1 ; Modem status port
- BRPORT EQU 89H ; Baud rate generator port (CTC)
- ENDIF ; SIERRA
- ;
- DAV EQU 00000001B ; Data available
- TBMT EQU 00000100B ; Transmit buffer empty
- DCD EQU 00001000B ; Data carrier detect
- ; [If you have problems, change to 00100000B]
- ;
- ; To access CTC baud rate command - Note, the CCS 2719 uses the 3.6864
- ; MHz xtal for the counter mode and the 4.000 MHz xtal for the timer
- ; mode. The SDS board uses the 4.000 MHz master clock for both.
- ;
- ; The following assume CCS2719 oscillator at 1.8432 MHz.
- ;
- IF CCS
- BD300 EQU 0734H ; 300 baud (4.000 xtal, rest 1.8432)
- BD1200 EQU 4760H ; 1200 baud
- BD2400 EQU 4730H ; 2400 baud
- ENDIF
- ;
- ; The following assume SIERRA DATA SCIENCE oscillator at 4.000 MHz.
- ;
- IF SIERRA
- BD300 EQU 0734H ; 300 baud
- BD1200 EQU 4768H ; 1200 baud
- BD2400 EQU 4734H ; 2400 baud
- ENDIF
- ;
- ;-----------------------------------------------------------------------
- ;
- ; See if we still have a carrier - if not, return with the zero flag set
- ;
- MDCARCK:MVI A,10H ; Reset status
- OUT SPORT
- IN SPORT ; Get status
- ANI DCD ; Check for carrier
- RZ
- ORI 255
- RET
- ;
- ; Disconnect and wait for an incoming call
- ;
- MDINIT: MVI A,0 ; Setup to write register 0
- OUT SPORT
- MVI A,18H ; Reset channel
- OUT SPORT
- MVI A,4 ; Setup to write register 4
- OUT SPORT
- MVI A,44H ; Set 16x, 1 stop bit, no parity
- OUT SPORT
- MVI A,3 ; Setup to write register 3
- OUT SPORT
- MVI A,0C1H ; 8 bits, Rx enable
- OUT SPORT
- MVI A,5 ; Setup to write register 5
- OUT SPORT
- MVI A,68H ; DTR off
- OUT SPORT
- ;
- PUSH B ; Save in case it's being used elsewhere
- MVI B,20 ; 2 second delay to drop any carrier
- OFFTI: CALL DELAY ; 1 second delay
- DCR B
- JNZ OFFTI ; Keep looping until finished
- POP B ; Restore 'BC'
- ;
- MVI A,5 ; Setup to write register 5
- OUT SPORT
- MVI A,0E8H ; Turn DTR back on
- OUT SPORT
- ;
- IF IMODEM ; If using an intellegent modem
- CALL IMINIT ; Go initialize it now
- ENDIF ; IMODEM
- ;
- RET
- ;
- ; Input a character from the modem port
- ;
- MDINP: IN DPORT ; Get character
- RET
- ;
- ; Check the status to see if a character is available. If not, return
- ; with the zero flag set. If yes, use 0FFH to clear the flag.
- ;
- MDINST: IN SPORT ; Get status
- ANI DAV ; Got a character
- RZ ; Return if none
- ORI 255 ; Otherwise set the proper flag
- RET
- ;
- ; Send a character to the modem
- ;
- MDOUTP: OUT DPORT ; Send it
- RET
- ;
- ; See if the output is ready for another character
- ;
- MDOUTST:IN SPORT ; Get status
- ANI TBMT ; Ready for a character?
- RZ
- ORI 255
- RET
- ;
- ; Reinitialize the modem and hang up the phone by dropping DTR and
- ; leaving it inactive.
- ;
- MDQUIT: IF IMODEM
- CALL IMQUIT
- ENDIF ; IMODEM
- ;
- ;
- ; Called by the main program after caller types BYE
- ;
- MDSTOP: MVI A,5 ; Setup to write register 5
- OUT SPORT
- MVI A,68H ; Turn off DTR until next time
- OUT SPORT
- RET
- ;
- ; The following routine sets the baudrate. BYE3 asks for the maximum
- ; speed you have available.
- ;
- SET300: LXI H,BD300 ; Set for 300 baud
- JMP SETBAUD
- ;
- SET1200:LXI H,BD1200 ; Set for 1200 baud
- JMP SETBAUD
- ;
- SET2400:LXI H,BD2400 ; Set for 2400 baud
- ;
- SETBAUD:MOV A,H
- OUT BRPORT ; Set CTC mode
- MOV A,L
- OUT BRPORT ; Set actual speed
- XRA A ; Say rate is ok
- RET
- ; end
- ;-----------------------------------------------------------------------