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-
- ; B5EA-2.INS - Eagle II and Eagle III insert for BYE5 - 12/01/85
- ;
- ; Z80 SIO and CTC 8340 timer
- ;
- ; Note: This is an insert, not an overlay.
- ;
- ; This version is for the Eagle II and III computers using channel "A"
- ; Z80 SIO. The Z80-CTC is used as the baud rate generator.
- ;
- ;
- ; NOTE: The Eagle does not support DTR on pin 20 or DCD on pin 8, so
- ; be sure you wire the modem cable like this:
- ;
- ; modem Eagle
- ;
- ; TXD 2 --> 3 RXD
- ; RXD 3 <-- 2 TXD
- ; GND 7 --- 7 GND
- ; DCD 8 --> 5 CTS
- ; DTR 20 <-- 4 RTS
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; 12/01/85 Fixed the LOADBD routine to output correctly, thanks to
- ; Dennis Recla - Irv Hoff
- ;
- ; 07/17/85 Written for use with BYE5 - Irv Hoff
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ;-----------------------------------------------------------------------
- ;
- ; Note: For Port A, Data = 18H, CTC = 01H, Port B, Data = 1AH, CTC = 02H
- ;
- PORT EQU 18H ; Data port
- MDCTL1 EQU PORT+1 ; Status/control port
- BRPORT EQU 01H ; Baud rate port
- ;
- ;
- BD300: DW 47D0H ; 62400/300 (first half is CTC command)
- BD1200: DW 4734H ; 62400/1200
- BD2400: DW 471AH ; 62400/2400
- ;
- ;
- ;-----------------------------------------------------------------------
- ;
- ; 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
- 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,84H ;*1 stop, 8 bits, no parity, 32x
- 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: LHLD BD300 ; Get 300 bps parameters in 'HL'
- JMP LOADBD ; Go load them
- ;
- SET1200:LHLD BD1200
- JMP LOADBD
- ;
- SET2400:LHLD BD2400
- ;
- LOADBD: MOV A,H ; CTC command word
- OUT BRPORT
- MOV A,L ; Baudrate
- OUT BRPORT
- XRA A
- RET
- ;.....
- ;
- ; end
- ;-----------------------------------------------------------------------