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-
- ; B5DC-1.INS - Hayes MM-100 insert for BYE5 - 07/17/85
- ;
- ; D. C. Hayes MicroModem 100 Interface routines
- ;
- ; This version is for the D.C. Hayes MM100 and 80-103A modem cards.
- ; Note: This is an insert, not an overlay.
- ;
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; 07/17/85 Written for use with BYE5 - Irv Hoff
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ;
- ; Port equates
- ;
- PORT EQU 80H ; Modem data port
- MDCTL1 EQU PORT+1 ; Status port and control port #1
- MDCTL2 EQU PORT+2 ; Control port #2
- ;
- ;
- ;-----------------------------------------------------------------------
- ;
- ; See if we still have a carrier - if not, return with the zero flag set
- ;
- MDCARCK:IN MDCTL1 ; Read port
- ANI 40H ; Carrier there?
- RET
- ;.....
- ;
- ;
- ; Disconnect and wait for an incoming call
- ;
- MDINIT: XRA A ; Drop carrier, if any
- OUT MDCTL2 ; Clear off-hook flag, turn off carrier
- RET
- ;.....
- ;
- ;
- ; Input a character from the modem port
- ;
- MDINP: IN PORT ; Get character
- RET
- ;.....
- ;
- ;
- ; Check the satus 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 ; Get status
- ANI 01H ; Check the receive ready bit
- RZ
- ORI 0FFH
- 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 02H ; Check transmit ready bit
- RET ; Return with proper status
- ;.....
- ;
- ;
- ; Reinitialize the modem and hang up the phone by dropping DTR and
- ; leaving it inactive.
- ;
- MDQUIT:
- MDSTOP: RET ; Unused
- ;.....
- ;
- ;
- ; The following routine sets the baudrate. BYE5 asks for the maximum
- ; speed you have available.
- ;
- SET1200 EQU $ ; 1200 bps not supported
- SET2400 EQU $ ; 2400 bps not supported
- ;
- SETINV: ORI 0FFH ; Make sure the Zero flag isn't set
- RET
- ;.....
- ;
- ;
- SET300: MVI A,17H ; 8 bits, no parity, 1 stop bit
- OUT MDCTL1
- MVI A,83H ; 300 baud and answer phone
- OUT MDCTL2
- XRA A ; Make sure Z is set
- RET
- ;.....
- ;
- ; end
- ;-----------------------------------------------------------------------