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B5SV-1.INS
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2000-06-30
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176 lines
;
; B5SV-1.INS - BYE5 insert for Servo-8 Single board computer - 08/02/85
;
; Z80 DART and Z80 CTC baudrate generator
;
; This routine adapts the Servo-8 single board computer to BYE5. Baudrate is
; sent to the baudrate generator upon powerup, from default
; jumpers.
;
; **** Note: This is an insert, not an overlay. ****
;
; = = = = = = = = = = = = = = = = = =
; 08/02/85 Converted for the Servo-8 computer
; from B3AD-0.INS & changed name to
; B5SV-1.INS - Paul Leighly
; 06/10/85 Rewritten for BYE335 and later - Irv Hoff
; 05/15/85 First version of B3AD - John Sojak
;
; = = = = = = = = = = = = = = = = = =
;
;
PORT EQU 06H ; Data port
MDCTL1 EQU PORT+1 ; Modem control port
BRPORT EQU 09H ; Set baud rate generator base port
;
MDRCV EQU 1 ; Modem receive ready bit
MDSND EQU 4 ; Modem send ready bit
MDDCD EQU 8 ; Data carrier detect
;
;
; Divisors for the CTC baudrate geneator
;
BD300 EQU 0 ; 300 baud
BD1200 EQU 40H ; 1200 bps
BD2400 EQU 10 ; 2400 bps
;
;
;-----------------------------------------------------------------------
;
; 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 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,84H ; Set 32x, 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,6AH ; 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,0EAH ; 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
ANI 7FH ; Strip parity
RET
;.....
;
;
; Check the status to see if a character is available. If not, return
; with the zero flage 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,6AH ; Turn off DTR until next time
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
;.....
;
;
SET300: MVI A,47H
OUT BRPORT
MVI A,BD300
OUT BRPORT
RET
;
SET1200:MVI A,47H
OUT BRPORT
MVI A,BD1200
OUT BRPORT
RET
;
SET2400:MVI A,47H
OUT BRPORT
MVI A,BD2400
OUT BRPORT
RET
;
;.....
;
; end
------------------------------------------------------------------------:
0
OUT BRPORT
RET
;
;.....
;
; en