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-
- ; B3R1-1.INS - TRS-80 Model I insert for BYE3 - 08/01/85
- ;
- ; TR1602 I/O and BR19411 baudrate generator
- ;
- ; Note: This is an insert not an overlay
- ;
- ;----------------------------------------------------------------
- ;
- ; 08/01/85 Upgraded for v337 - pst
- ; 06/25/83 Originally written - pst
- ;
- ;----------------------------------------------------------------
- ;
- ; Modem port equates
- ;
- DPORT EQU 0EBH ; Modem port
- SPORT EQU DPORT-1 ; Status port
- BPORT EQU DPORT-2 ; Baud rate port
- RPORT EQU DPORT-3 ; Reset port
- ;
- DAV EQU 10000000B ; Data available
- TBMT EQU 01000000B ; Xmit buffer empty
- DCD EQU 00100000B ; Data carrier detect
- ;
- B300 EQU 055H ; 300 baud
- B1200 EQU 077H ; 1200 bps
- B2400 EQU 0AAH ; 2400 bps
- ;
- ;-----------------------------------------------------------------------
- ;
- ; See if we still have a carrier - if not, return with the zero flat set
- ;
- MDCARCK:IN RPORT ; Read port
- ANI DCD ; Mask carrier detect
- RZ
- ORI 255
- RET
- ;
- ; Disconnect and wait for an incoming call
- ;
- MDINIT: MVI A,01 ; Reset UART, enable modem control
- OUT RPORT
- MVI A,68H ; DTR, RTS off to hang up phone
- OUT SPORT
- ;
- PUSH B
- MVI B,20 ; 2 seconds to let modem settle down
- OFFTI: CALL DELAY
- DCR B
- JNZ OFFTI
- POP B
- ;
- MVI A,6BH ; Turn DTR back on
- OUT SPORT
- ;
- IF IMODEM
- CALL IMINIT
- 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 ; Read port
- ANI DAV ; Mask crap
- RZ ; Nope, nothing there
- ORI 255 ; We got something...
- 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 ; Mask crap
- RZ
- ORI 255
- RET
- ;
- ; Reinitialize the modem and hang up the phone by dropping DTR and
- ; leaving it inactive.
- ;
- MDQUIT: IF IMODEM
- CALL IMQUIT ; Tell smartmodem to shut down
- ENDIF ; IMODEM
- ;
- ; Called by main program after caller has typed BYE
- ;
- MDSTOP: MVI A,68H ; Turn off DTR so that modem will quit
- OUT SPORT
- RET
- ;
- ; The following routine sets the baudrate. BYE3 asks for the maximum
- ; speed you have available.
- ;
- SET300: MVI A,B300
- JMP SETBAUD
- ;
- SET1200:MVI A,B1200
- JMP SETBAUD
- ;
- SET2400:MVI A,B2400
- ;
- SETBAUD:OUT BPORT
- XRA A
- RET
- ; end
- ;-----------------------------------------------------------------------