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bye3
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b3ad-2.iqs
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B3AD-2.INS
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1985-11-17
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4KB
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154 lines
;
; B3AD-2.INS - BYE3 insert for AD Super Six CPU board - 07/30/85
;
; Z80 DART and 8116 baudrate generator
;
; This routine adapts the Advanced Digital Super Quad and Super Six
; single board computers to BYE3. Baudrate is read in off of a parallel
; port and sent to the baudrate generator upon powerup, from default
; jumpers. Note: This is an insert, not an overlay.
;
; = = = = = = = = = = = = = = = = = =
;
; 07/30/85 Restored to original format - pst
; 05/15/85 First version of B3AD - John Sojak
;
; = = = = = = = = = = = = = = = = = =
;
;
DPORT EQU 02H ; Data port
SPORT EQU DPORT+1 ; Modem control port
BRPORT EQU 18H ; Set baud rate generator base port
JUMPRS EQU 15H ; Baud rate default jumpers
;
DAV EQU 00000001B ; Data available
TBMT EQU 00000100B ; Transmit buffer empty
DCD EQU 00001000B ; Data carrier detect
;
; Divisors for the 8116 baudrate geneator
;
BD300 EQU 5 ; 300 baud
BD1200 EQU 7 ; 1200 baud
BD2400 EQU 10 ; 2400 baud
;
;-----------------------------------------------------------------------
;
; See if we still have a carrier - if not, return with the zero flag set
;
MDCARCK:MVI A,10H ; Reset status
OUT SPORT
IN SPORT ; Get status
ANI DCD ; Check for carrier
RZ
ORI 255
RET
;
; Disconnect and wait for an incoming call
;
MDINIT: MVI A,0 ; Setup to write register 0
OUT SPORT
MVI A,18H ; Reset channel
OUT SPORT
MVI A,4 ; Setup to write register 4
OUT SPORT
MVI A,44H ; Set 16x, 1 stop bit, no parity
OUT SPORT
MVI A,3 ; Setup to write register 3
OUT SPORT
MVI A,0C1H ; 8 bits, Rx enable
OUT SPORT
MVI A,5 ; Setup to write register 5
OUT SPORT
MVI A,68H ; DTR off
OUT SPORT
;
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 SPORT
MVI A,0E8H ; Turn DTR back on
OUT SPORT
;
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 DPORT ; Get character
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 SPORT ; Get status
ANI DAV ; Got a character
RZ ; Return if none
ORI 255 ; Otherwise set the proper flag
RET
;
; Send a character to the modem
;
MDOUTP: OUT DPORT ; Send it
RET
;
; See if the output is ready for another character
;
MDOUTST:IN SPORT ; Get status
ANI TBMT ; Ready for a character?
RZ
ORI 255
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 SPORT
MVI A,68H ; Turn off DTR until next time
OUT SPORT
RET
;
; The following routine sets the baudrate. BYE5 asks for the maximum
; speed you have available.
;
SET300: MVI A,BD300
JMP SETBAUD
;
SET1200:MVI A,BD1200
JMP SETBAUD
;
SET2400:MVI A,BD2400
;
; Sets the baudrate
;
SETBAUD:RLC ; Shift the nibble over to the LSN
RLC ; (could have been eliminated in the
RLC ; equate but the intent is easier to
RLC ; understand this way.
ANI 11110000B ; Mask off bits - intent again
PUSH B
MOV B,A
IN JUMPRS ; Get the console baud jumpers
ANI 00001111B ; Mask garbage - 4 bits worth of it
ORA B ; and make a composite of modem and
OUT BRPORT ; console then tell the generator
POP B
XRA A ; Say baudrate is ok
RET
; end
;-----------------------------------------------------------------------