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- ; B5MT-1.INS - Memotech SDX-512 computer insert for BYE5 - 02/11/86
- ;
- ; DART I/O and CTC timer 4.000 MHz
- ;
- ; Note: This is an insert, not an overlay.
- ;
- ; This version is for the Memotech SDX-512 using channel "B" of the Z80
- ; DART. The Z80-CTC is used as the baud rate generator.
- ;
- ; NOTE: The carrier detect input is checked for "Active low" which
- ; is quite unusual, and requires a "CMA" in MDCARCK.
- ;
- ; Make up a RS232 cable per the instructions below:
- ;
- ; Modem Ampro
- ; ----- -----
- ; pin 2 - pin 2
- ; pin 3 - pin 3
- ; pin 7 - pin 7
- ; pin 8 - pin 8
- ; pin 20 - pin 20
- ;
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; 02/11/86 Initial Memotech version - Irv Hoff
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ;-----------------------------------------------------------------------
- ;
- ; Values given are for port 'B'
- ;
- PORT EQU 0DH ; Data port
- MDCTL1 EQU 0FH ; Status/control port
- BRPORT EQU 0AH ; Baud rate port
- ;
- ;
- ;-----------------------------------------------------------------------
- ;
- ; See if we still have a carrier - if not, return with the zero flag set
- ;
- MDCARCK:MVI A,10H ; Reset status
- OUT MDCTL1
- IN MDCTL1 ; Get status
- CMA ; Invert for "active low" for Memotech
- ANI 20H ; Check for data carrier
- RET
- ;.....
- ;
- ;
- ; Disconnect and wait for an incoming call
- ;
- MDINIT: MVI A,18H ; Reset channel
- OUT MDCTL1
- MVI A,4 ; Setup to write register 4
- OUT MDCTL1
- MVI A,44H ;*1 stop, 8 bits, no parity, 16x
- OUT MDCTL1
- MVI A,5 ; Setup to write register 5
- OUT MDCTL1
- MVI A,68H ; Clear RTS causing hangup
- OUT MDCTL1
- PUSH B ; Save in case it's being used elsewhere
- MVI B,20 ; 2 seconds delay to drop any carrier
- ;
- OFFTI: CALL DELAY ; 0.1 second delay
- DCR B
- JNZ OFFTI ; Keep looping until finished
- POP B ; Restore bc
- MVI A,3 ; Setup to write register 3
- OUT MDCTL1
- MVI A,0C1H ; Initialize receive register
- OUT MDCTL1
- MVI A,5 ; Setup to write register 5
- OUT MDCTL1
- MVI A,0EAH ; Turn on RTS so modem can answer phone
- OUT MDCTL1
- ;
- IF IMODEM ; If using intelligent modem
- CALL IMINIT ; Go initialize
- ENDIF ; IMODEM
- ;
- RET
- ;.....
- ;
- ;
- ; Input a character from the modem port
- ;
- MDINP: IN PORT ; 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 MDCTL1 ; Get status
- ANI 01H ; Check receive ready bit
- RZ ; Return if none
- ORI 0FFH ; Otherwise, set the proper flag
- RET
- ;.....
- ;
- ;
- ; Send a character to the modem
- ;
- MDOUTP: OUT PORT ; Send it
- RET
- ;.....
- ;
- ;
- ; See if the output is ready for another character
- ;
- MDOUTST:IN MDCTL1
- ANI 04H ; Check transmit ready bit
- RET
- ;.....
- ;
- ;
- ; Reinitialize the modem and hang up the phone by dropping DTR and
- ; leaving it inactive.
- ;
- MDQUIT: IF IMODEM ; If using a smartmodem
- CALL IMQUIT ; Tell it to shut down
- ENDIF ; IMODEM
- ;
- ;
- ; Called by the main program after caller types BYE
- ;
- MDSTOP: MVI A,5 ; Setup to write register 5
- OUT MDCTL1
- MVI A,68H ; Clear RTS causing shutdown
- OUT MDCTL1
- RET
- ;.....
- ;
- ;
- ; The following routine sets the baudrate. BYE5 asks for the maximum
- ; speed you have available.
- ;
- SETINV: ORI 0FFH ; Make sure zero flag is not set
- RET ; Return
- ;.....
- ;
- ;
- SET300: MVI B,BD300 ; Get 300 bps parameters in 'HL'
- JMP LOADBD ; Go load them
- ;
- SET1200:MVI B,BD1200
- JMP LOADBD
- ;
- SET2400:MVI B,BD2400
- JMP LOADBD
- ;
- SET9600:MVI B,BD9600
- ;
- LOADBD: MVI A,47H ; CTC command word
- OUT BRPORT
- MOV A,B ; Baudrate
- OUT BRPORT
- XRA A
- RET
- ;.....
- ;
- ;
- BD300 EQU 64 ; 19200/300 (first half is CTC command)
- BD1200 EQU 16 ; 19200/1200
- BD2400 EQU 8 ; 19200/2400
- BD9600 EQU 2 ; 19200/9600
- ;
- ; end
- ;-----------------------------------------------------------------------