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b3tv-2.ins
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1994-07-13
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4KB
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149 lines
; B3TV-2.INS - BYE3 insert for TeleVideo TS-802 - 08/01/85
;
; SIO I/O and CTC baudrate generator
;
; Note: This is an insert, not an overlay.
;
; = = = = = = = = = = = = = = = = = =
;
; 04/16/83 TS802 code created from B3SIO - Kevin Robesky
;
; = = = = = = = = = = = = = = = = = =
;
;
; Modem port equates
;
DPORT EQU 20H ; Modem data port
SPORT EQU DPORT+2 ; Modem status port
BDPORT EQU 08H ; Modem baud rate port
;
; Status port masks
;
DAV EQU 00000001B ; Data available
TBMT EQU 00000100B ; Transmit buffer empty
DCD EQU 00001000B ; Data carrier detect
;
; First Byte of CTC Command:
;
BDCMD EQU 47H
;
; Baudrate table
;
BD300 EQU 80H ; 300 baud
BD1200 EQU 20H ; 1200 bps
BD2400 EQU 10H ; 2400 bps
;
;-----------------------------------------------------------------------
;
; 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 detect
RZ
ORI 255
RET
;
; Disconnect and wait for an incoming call
;
MDINIT: MVI A,18H ; Reset channel
OUT SPORT
MVI A,4 ; Setup to write register 4
OUT SPORT
MVI A,44H ; 1 stop, 8 bits, no parity
OUT SPORT
MVI A,1 ; Setup to write register 1
OUT SPORT
MVI A,00H
OUT SPORT
MVI A,5 ; Setup to write register 5
OUT SPORT
MVI A,68H ; Clear DTR causing hangup
OUT SPORT
;
PUSH B ; In case it is 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 SPORT
MVI A,0C1H ; Initialize receive register
OUT SPORT
MVI A,5 ; Setup to write register 5
OUT SPORT
MVI A,0EAH ; Turn on DTR so modem can answer phone
OUT SPORT
;
IF IMODEM
CALL IMINIT ; Initialize smartmodem
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 flag set. If yes, use 0FFH to clear the flag.
;
MDINST: IN SPORT ; Get status
ANI DAV ; Check receive ready bit
RZ ; Return if none
ORI 255 ; Otherwise, set the flags
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 ; Read port
ANI TBMT ; Check transmit ready bit
RZ
ORI 255
RET
;
; Reinitialize the modem and hang up the phone by dropping DTR and
; leaving it inactive
;
MDQUIT: IF IMODEM
CALL IMQUIT ; If a smartmodem, 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 SPORT
MVI A,68H ; Clear DTR causing shutdown
OUT SPORT
RET
;
; The following routine sets the baudrate. BYE3 asks for the maximum
; speed you have available.
;
SET300: MVI B,BD300 ; 2nd byte of command
JMP STBAUD
;
SET1200:MVI B,BD1200 ; 2nd byte of command
JMP STBAUD
;
SET2400:MVI B,BD2400
STBAUD: MVI A,BDCMD
OUT BDPORT ; Send 1st byte of command
MOV A,B ; Get the speed byte back again
OUT BDPORT ; Send it
XRA A ; Say rate is OK
RET
; end
;-----------------------------------------------------------------------