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- ; B5R4-1.INS - BYE5 insert for TRS-80 Model IV - 07/17/85
- ;
- ; TR1865 I/O and BR1943 baudrate generator
- ;
- ; Note: This is an insert not an overlay
- ;
- ;
- ; This BYE5 insert is for the TRS-80 model IV and Model IV Gate Array
- ; computers using the Montezuma Micro CP/M 2.2.
- ;
- ; NOTE: The MDCARCK routine contains a "XRI" statement other similar
- ; inserts do not have. The TRS-Model IV seems to invert the
- ; DCD line from the modem. If having problems installing this
- ; insert, you might try nulling out the XRI instruction.
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; 07/17/85 Written to work with BYE5 - Irv Hoff
- ; 06/15/85 Modified from my previous B31865 insert - Tom Brady
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ;
- ; Modem port equates
- ;
- PORT EQU 0EBH ; Modem port
- MDCTL1 EQU PORT-1 ; Status port
- MDCTL2 EQU PORT-2 ; Baud rate port
- MDCTL3 EQU PORT-3 ; Reset port
- ;
- MDRCV EQU 80H ; Data available
- MDSND EQU 40H ; Xmit buffer empty
- MDDCD EQU 20H ; Data carrier detect
- ;
- ;
- B300 EQU 55H ; 300 baud
- B1200 EQU 77H ; 1200 bps
- B2400 EQU 0AAH ; 2400 bps
- ;
- ;
- ;-----------------------------------------------------------------------
- ;
- ; See if we still have a carrier - if not, return with the zero flat set
- ;
- MDCARCK:IN MDCTL3 ; Read port
- ANI MDDCD ; Isolate the DCD response
- XRI MDDCD ; Invert the signal
- RET
- ;.....
- ;
- ;
- ; Disconnect and wait for an incoming call
- ;
- MDINIT: MVI A,0EBH ; DTR, RTS off to hang up phone
- OUT MDCTL1
- PUSH B
- MVI B,20 ; 2 seconds to let modem settle down
- CALL DLP1
- MVI A,01 ; Reset UART, enable modem control
- OUT MDCTL3
- MVI A,0ECH ; Turn DTR back on
- OUT MDCTL1
- MVI B,2 ; Slight additional delay
- CALL DLP1
- POP B
- ;
- IF IMODEM
- CALL IMINIT
- 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 ; Read port
- ANI MDRCV ; Mask crap
- RZ ; Nope, nothing there
- ORI 0FFH ; We got something...
- 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 ; Read port
- ANI MDSND ; Mask crap
- RET
- ;.....
- ;
- ;
- ; Reinitialize the modem and hang up the phone by dropping DTR and
- ; leaving it inactive.
- ;
- MDQUIT: IF IMODEM
- CALL IMQUIT ; Send ATZ and ATS0=0 (auto-answer off)
- ENDIF ; IMODEM
- ;
- ;
- ; Called by main program after caller types BYE
- ;
- MDSTOP: MVI A,0EBH ; Turn off DTR so that modem will quit
- OUT MDCTL1
- RET
- ;.....
- ;
- ;
- ; The following routine sets the baudrate. BYE5 asks for the maximum
- ; speed you have available.
- ;
- SETINV: ORI 0FFH ; Make sure the zero flag is not set
- RET
- ;.....
- ;
- ;
- SET300: MVI A,B300
- JMP SETBAUD
- ;
- SET1200:MVI A,B1200
- JMP SETBAUD
- ;
- SET2400:MVI A,B2400
- ;
- SETBAUD:OUT MDCTL2
- XRA A
- RET
- ;.....
- ;
- ; end
- ;-----------------------------------------------------------------------