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walnut-creek-CDROM
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MEX
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MXO-VP10.AQM
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MXO-VP10.ASM
Wrap
Assembly Source File
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2000-06-30
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6KB
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222 lines
TITLE 'MEX VENTEL MD212 PLUS MODEM OVERLAY V1.0'
;
; (DELETE ABOVE TITLE LINE IF ASSEMBLING WITH ASM)
;
; used smartmodem overlay for MEX: revision 1.2
; Written 04/16/84 by Ronald G. Fowler (V1.2) as an outline.
;
; Written by:
; Bruce Childers & Jon Albers
; Data - 202-633-0804, 0805, 0806
; 703-281-7907
;
; This overlay will allow you to use a Ven-Tel Plus modem with Mex.
; It will allow auto-dial. Note -- You can only disconnect using
; DTR, so set the DISC equatte to false.
;
; This overlay will work with any modem overlay that terminates
; prior to 0B00H
;
FALSE EQU 0
TRUE EQU NOT FALSE
;
;
DISC EQU FALSE ;<<== CHANGE TO FALSE IF YOU DISC. WITH DTR
PENRIL EQU FALSE ;Set true if you have a Penril
;
; SYSTEM CONSTANTS
;
DIALV EQU 0162H ;LOCATION OF DIAL VECTOR IN OVERLAY
DISCV EQU 0165H ;LOCATION OF DISCONNECT VECTOR IN OVERLAY
DIALOC EQU 0B00H ;DIALING CODE GOES HERE
MEX EQU 0D00H ;"CALL MEX"
;
; FOLLOWING ARE FUNCTION CODES FOR THE MEX SERVICE CALL PROCESSOR
;
INMDM EQU 255 ;RETURN CHAR FROM MDM IN A, CY=NO CHR IN 100MS
TIMER EQU 254
TMDINP EQU 253 ;B=# SECS TO WAIT FOR CHAR, CY=NO CHAR
CHEKCC EQU 252 ;CHECK FOR ^C FROM KBD, Z=PRESENT
SNDRDY EQU 251 ;TEST FOR MODEM-SEND READY
RCVRDY EQU 250 ;TEST FOR MODEM-RECEIVE READY
SNDCHR EQU 249 ;SEND A CHARACTER TO THE MODEM (AFTER SNDRDY)
RCVCHR EQU 248 ;RECV A CHAR FROM MODEM (AFTER RCVRDY)
;
CR EQU 13
LF EQU 10
;
;
;
ORG DIALV ;OVERLAY THE DIALING VECTOR
JMP DIAL
;
IF DISC ;IF PROVIDING DISCONNECT CODE
ORG DISCV ;OVERLAY THE VECTOR
JMP DISCON
ENDIF
;
; This is the DIAL routine called by MEX to dial a digit. The digit
; to be dialed is passed in the A register. Note that two special
; codes must be intercepted as non-digits: 254 (start dial sequence)
; and 255 (end-dial sequence). Mex will always call DIAL with 254
; in the accumulator prior to dialing a number. Mex will also call
; dial with 255 in A as an indication that dialing is complete. Thus,
; the overlay may use these values to "block" the number, holding it
; in a buffer until it is completely assembled.
; After the 254-start-dial sequence, MEX will call the overlay with
; digits, one-at-a-time. MEX will make no assumptions about the dig-
; its, and will send each to the DIAL routine un-inspected (some modems,
; like the Smartmodem, allow special non-numeric characters in the
; phone number, and MEX may make no assumptions about these).
;
; After receiving the end-dial sequence (255) the overlay must take
; whatever end-of-dial actions are necessary *including* waiting for
; carrier at the distant end. The overlay should monitor the keyboard
; during this wait (using the MEX keystat service call), and return
; an exit code to MEX in the A register, as follows:
;
; 0 - Carrier detected, connection established
; 1 - Far end busy (only for modems that can detect this condition)
; 2 - No answer (or timed out waiting for modem response)
; 3 - Keyboard abort (^C only: all others should be ignored)
; 4 - Error reported by modem
;
; <No other codes should be returned after an end-dial sequence>
;
; The overlay should not loop forever in the carrier-wait routine, but
; instead use either the overlay timer vector, or the INMDMV (timed 100
; ms character wait) service call routine.
;
; The DIAL routine is free to use any of the registers, but must return
; the above code after an end-dial sequence
;
ORG DIALOC
;
DIAL: CPI 254 ;START DIAL?
JZ STDIAL ;JUMP IF SO
CPI 255 ;END DIAL?
JZ ENDIAL ;JUMP IF SO
;
; Not start or end sequence, must be a digit to be sent to the modem
;
CALL SEND ;SEND CHARACTER TO MODEM
RET ;ALL DONE
;
; Here on a start-dial sequence
;
STDIAL: CALL SETUP ;WAKE UP THE VENTEL
RET
;
; Here on an end-dial sequence
;
ENDIAL: MVI A,CR ;PUT A CR AT THE END
CALL SEND ;SEND CR TO MODEM
WAITVP: MVI C,INMDM
CALL MEX ;CATCH ANY OUTPUT FROM THE MODEM
JNC WAITVP ;LOOP UNTIL NO MORE CHARACTERS
;
; THE FOLLOWING LOOP WAITS FOR A RESULT FROM THE MODEM (UP TO
; 60 SECONDS: YOU MAY CHANGE THIS VALUE IN THE FOLLOWING LINE).
;
RESULT: MVI C,60 ;<<== MAXIMUM TIME TO WAIT FOR RESULT
VPWLP: PUSH B
MVI B,1 ;CHECK FOR A CHAR, UP TO 1 SEC WAIT
MVI C,TMDINP ;DO TIMED INPUT
CALL MEX
POP B
JNC VPTEST ;JUMP IF MODEM HAD A CHAR
PUSH B ;NO, TEST FOR CONTROL-C FROM CONSOLE
MVI C,CHEKCC
CALL MEX
POP B
JNZ VPNEXT ;IF NOT, JUMP
MVI B,CR ;YES, SHUT DOWN THE MODEM
MVI C,SNDCHR
CALL MEX
MVI A,3 ;RETURN ABORT CODE
RET
VPNEXT: DCR C ;NO
JNZ VPWLP ;CONTINUE
;
; ONE MINUTE WITH NO MODEM RESPONSE (OR NO CONNECTION)
;
VPTIMO: MVI A,2 ;RETURN TIMEOUT CODE
RET
;
; MODEM GAVE US A RESULT, CHECK IT
;
VPTEST: ANI 7FH ;IGNORE ANY PARITY
CALL VPANAL ;TEST THE RESULT
MOV A,B ;A=RESULT (CY SIGNIFICANT HERE TOO)
PUSH PSW ;SAVE IT
VPTLP: MVI C,INMDM ;FLUSH ANY REMAINING COMMAND LINE
CALL MEX
JC VPCHEK ;JUMP IF NO INPUT
CPI LF ;GOT SOME ... WAITING FOR EOL
JNZ VPTLP ;EAT ANY IN-BETWEEN
VPCHEK: POP PSW ;A HAS MEX RETURN-CODE, CY=1 IF UNKNOWN
JC RESULT ;IF RESULT UNKNOWN, IGNORE IT
RET
;
VPANAL: MVI B,0 ;PREP CONNECT CODE
CPI 'O' ;"CONNECT"?
RZ
INR B ;PREP BUSY CODE B=1
CPI 'B'
RZ
INR B ;PREP NO CONNECT MSG B=2
CPI 'N' ;N=NO CONNECT
RZ
MVI B,4 ;PREP MODEM ERROR
CPI 'E' ;E=ERROR
RZ
STC ;UNKNOWN...
RET
;
; SET UP ROUTINE TO WAKE VEN-TEL UP
;
SETUP: MVI C,SNDRDY ;CHECK TO SEE IF MODEM IS ALIVE
CALL MEX
JNZ SETUP
MVI A,CR ;send first cr of 3
CALL SEND
CALL DELAY1 ;Wait to avoid sending CR's too fast for modem
SETUP2: MVI C,SNDRDY
CALL MEX
JNZ SETUP2
MVI A,CR ;send second cr
CALL SEND
CALL DELAY1
SETUP3: MVI C,SNDRDY
CALL MEX
JNZ SETUP3
MVI A,CR ;send third cr
CALL SEND
MVI B,30 ;Wait to get past banner
MVI C,TIMER
CALL MEX
CALL DELAY1
KOUT: MVI C,SNDRDY
CALL MEX
JNZ KOUT
MVI B,'K' ;GET READY TO DIAL
MVI C,SNDCHR
CALL MEX
CALL DELAY1
RET
;
DELAY1: MVI B,5 ;Delay routine
MVI C,TIMER
CALL MEX
RET
; SEND A CHARACTER TO THE MODEM
;
SEND: MOV B,A ;WHEN CALLING HERE, THE CHAR IS IN A
MVI C,SNDCHR
CALL MEX
RET
; End of Overlay
END