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NUXE-1.INS
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2000-06-30
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3KB
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134 lines
; NUXE-1.INS - Xerox 820 insert for NUBYE - 04/21/86
;
; Z80-SIO and 8116 baudrate generator
;
; Note: This is an insert, not an overlay.
;
; ========
;
; 04/21/86 Modified for NUBYE
; 07/17/85 Written for use with BYE5 - Irv Hoff
;
; ========
;
PORT EQU 4 ; Data port
MDCTL1 EQU PORT+2 ; Modem control port
BRPORT EQU 0 ; Baud rate generator port
;
MDRCV EQU 1 ; Modem receive ready bit
MDSND EQU 4 ; Modem send ready bit
MDDCD EQU 8 ; Data carrier detect
;
; Divisors for the 8116 baudrate generator
;
BD300 EQU 5 ; 300 baud
BD1200 EQU 7 ; 1200 bps
BD2400 EQU 10 ; 2400 bps
;
; See if we still have a carrier - if not, return with the zero flat set
;
MDCARCK:MVI A,10H ; Reset status
OUT MDCTL1
IN MDCTL1 ; Get status
ANI MDDCD ; Check for carrier
RET
;
; Disconnect and wait for an incoming call
;
MDINIT: MVI A,0 ; Setup to write register 0
OUT MDCTL1
MVI A,18H ; Reset channel
OUT MDCTL1
MVI A,4 ; Setup to write register 4
OUT MDCTL1
MVI A,44H ; Set 16x, 1 stop bit, no parity
OUT MDCTL1
MVI A,3 ; Setup to write register 3
OUT MDCTL1
MVI A,0C1H ; 8 bits, Rx enable
OUT MDCTL1
MVI A,5 ; Setup to write register 5
OUT MDCTL1
MVI A,68H ; DTR off
OUT MDCTL1
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 MDCTL1
MVI A,0E8H ; Turn DTR back on
OUT MDCTL1
;
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 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 MDRCV ; Got a character
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 ; Get status
ANI MDSND ; Ready for a character?
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 MDCTL1
MVI A,68H ; Turn off DTR until next time
OUT MDCTL1
RET
;
; The following routine sets the baud rate. NUBYE asks for the maximum
; speed you have available.
;
SETINV: ORI 0FFH ; Make sure zero flag is not set
RET
;
SET300: MVI A,BD300
JMP SETBAUD
;
SET1200:MVI A,BD1200
JMP SETBAUD
;
SET2400:MVI A,BD2400
;
; Sets the baudrate
;
SETBAUD:OUT BRPORT
XRA A ; Say baudrate is ok
RET
;
; end of insert
; -------------