; 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
;-----------------------------------------------------------------------
