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b5ea-2.ins
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1994-07-13
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4KB
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171 lines
; 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
;-----------------------------------------------------------------------