home *** CD-ROM | disk | FTP | other *** search
- TITLE 'MEX NEC N212BR-L1 MODEM OVERLAY V1.0'
- ;
- ; (DELETE ABOVE TITLE LINE IF ASSEMBLING WITH ASM)
- ;
- ; Original File: MXO-SM14.ASM
- ;
- ; Smartmodem overlay for MEX: revision 1.3
- ; Written 04/16/84 by Ronald G. Fowler (V1.0)
- ;
- ; 19/09/86: Altered for the NEC N212BR-L1 modem command set. This uses the
- ; NEC modem DIAL MODE 'K' command for KEYBOARD DIAL, sending
- ; two CRs with a two second wait between them to wake up the modem,
- ; another two second wait, the 'K', wait two more seconds, then
- ; the phone number.
- ; Also removed the NUMRES equate and the associated code as it's
- ; not used in this overlay.
- ; The NEC modem returns a whole scentence from the dialing
- ; sequence. For instance, if you tell it to dial: 1-234-567-8901
- ; the NEC modem would return:
- ;
- ; DIALING 1-234-567-8901.............(message)
- ;
- ; Where the message could be *ON LINE*, BUSY, RINGING, or ABORTED.
- ; So we have to search that string for valid characters. The on line
- ; is easy; look for a '*'. Busy look for a 'U', so the 'B' of
- ; 'ABORTED' doesn't trigger it, 'R' for ringing, and 'O' for
- ; 'ABORTED' so the 'A' in DIALING doesn't set that one off. We'll
- ; never see the 'O' in the on line message as the '*' grabs it first.
- ; This is kind of a kludge, but it works.
- ; This overlay assumes you are dropping DTR to disconnect. See the
- ; note at the DISC code if you plan to disconnect from here.
- ; (David Chapman)
- ;
- ; 09/05/84: Added option to check DCD to determine if a connection has
- ; been made. THIS IS MACHINE SPECIFIC. Also, Switch 6 on the
- ; Smartmodem should be UP. (David Jewett)
- ;
- ; 07/16/84: Added equate NUMRES to enable/disable numeric result code
- ; interpretation. Under TurboDos, the first digit of the
- ; phone number was being interpreted as a result code as it
- ; was echoed by the Anchor modem as it dialed. Set NUMRES false
- ; to disable numeric results. (Bob Puckett)
- ;
- ; 06/06/84: Fixed problem for Anchor users, where, when the modem returned
- ; "DIAL TONE", the "N" in "TONE" was being regarded as a NO-CONNECT
- ; code. Now we flush the entire result line before reading another.
- ; Also added code for numeric version of "CONNECT 1200". --RGF
- ;
- ; Small bug repaired: (V1.1) 05/14/84 (Steve Grandi): Smartmodem was not being
- ; flushed after a dial string so that last digit of the phone number
- ; was being interpreted as a numeric result code causing the program,
- ; for certain numbers, to give up even as the modem merrily dialed away.
- ;
- ; This modules adapts MEX for the NEC N212BR-L1 modem. It is quite
- ; machine specific. I don't know of any other modem that uses
- ; this scheme. The main function of this module is to provide
- ; dialing capability; the disconnect vector is ancillary.
- ; You may use this module as a model to develop dialing routines
- ; for non-standard modems (e.g., the Racal-Vadic). The only
- ; pertinent entry point is the DIAL routine; you'll find entry
- ; specs for that below.
- ;
- ; The only conditional you might want to change in this
- ; module is the DISC equate below -- if left on, MEX will
- ; use the Smartmodem's disconnect code. If you prefer to
- ; provide your own in your overlay's DISCV vector (e.g.,
- ; by dropping DTR), then set DISC to FALSE and re-assemble.
- ; (If you don't understand this, then play it safe, and
- ; leave the equate set as it is). (Set FALSE here - dlc)
- ;
- ; This overlay will work with any modem overlay that terminates
- ; prior to 0B00H
- ;
- FALSE EQU 0
- TRUE EQU NOT FALSE
- ;
- ;
- DCD EQU FALSE ; TRUE = CHECK DCD FOR CARRIER
- IF DCD ; if using DCD, we must know the following:
- STPORT EQU 0EDH ; ... Status Port assignment to get DCD
- DCDBIT EQU 0100$0000b ; ... Bit HIGH to test for DCD
- ENDIF ; DCD
- ;
- DISC EQU FALSE ;<<== CHANGE TO FALSE IF YOU DISC. WITH DTR
- ;
- ; SYSTEM CONSTANTS
- ;
- TPULSE EQU 0105H ;TONE/PULSE FLAG IN MODEM OVERLAY
- 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)
- ILP EQU 240 ;INLINE PRINT
- ;
- 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 (in fact, that's the
- ; scheme employed here for the Smartmodem).
- ;
- ; 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: LHLD DIALPT ;FETCH POINTER
- 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
- ;
- MOV M,A ;PUT CHAR IN BUFFER
- INX H ;ADVANCE POINTER
- SHLD DIALPT ;STUFF PNTR
- RET ;ALL DONE
- ;
- ; Here on a start-dial sequence
- ;
- STDIAL: LXI H,DIALBF ;SET UP BUFFER POINTER
- SHLD DIALPT
- RET
- ;
- ; Here on an end-dial sequence
- ;
- ENDIAL: MVI M,CR ;STUFF END-OF-LINE INTO BUFFER
- INX H ;FOLLOWED BY TERMINATOR
- MVI M,0
- MVI B,CR ; Send a couple of CRs to put the
- MVI C,SNDCHR ; modem in the interactive mode.
- CALL MEX ; If it's already there thats ok too.
- MVI B,20 ; Two second wait
- MVI C,TIMER
- CALL MEX
- MVI B,CR ; There goes the second one
- MVI C,SNDCHR
- CALL MEX
- MVI B,20 ; And another 2 seconds
- MVI C,TIMER
- CALL MEX
- MVI B,'K' ; Keyboard dial in NEC modem
- MVI C,SNDCHR
- CALL MEX
- MVI B,20 ; Wait a couple of seconds
- MVI C,TIMER
- CALL MEX
- LXI H,DIALBF ;POINT TO DIALING STRING
- CALL SMSEND ;SEND IT
- WAITSM: MVI C,INMDM
- CALL MEX ;CATCH ANY OUTPUT FROM THE MODEM
- JNC WAITSM ;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).
- ; NOTE THAT THE SMARTMODEM HAS AN INTERNAL 30 SECOND TIMEOUT WHILE
- ; FOR A CARRIER ON THE OTHER END. YOU CAN CHANGE BY PLAYING WITH THE
- ; S7 VARIABLE (I.E. SEND THE SMARTMODEM "AT S7=20" TO LOWER THE 30 SECOND
- ; WAIT TO 20 SECONDS).
- ;
- RESULT: MVI C,60 ;<<== MAXIMUM TIME TO WAIT FOR RESULT
- SMWLP: PUSH B
- MVI B,1 ;CHECK FOR A CHAR, UP TO 1 SEC WAIT
- MVI C,TMDINP ;DO TIMED INPUT
- CALL MEX
- POP B
- CPI '*' ; parse the returned string for
- JZ SMTEST ; valid characters
- CPI 'O' ; if an abort
- JZ SMTEST
- CPI 'U' ; if it's busy
- JZ SMTEST
- CPI 'R' ; if it's ringing
- CZ RING
- ;
- IF DCD ;if DCD is available, take a look at it
- IN STPORT ; get the status byte
- ANI DCDBIT ; and test the DCD flag
- XRI DCDBIT ; return with A=0 if found,
- RZ ;but otherwise ...
- ENDIF ;DCD
- ;
- PUSH B ; TEST FOR CONTROL-C FROM CONSOLE
- MVI C,CHEKCC
- CALL MEX
- POP B
- JNZ SMNEXT ;IF NOT, JUMP
- MVI B,' ' ;YES, SHUT DOWN THE MODEM
- MVI C,SNDCHR ; NEC uses a space to abort dialing
- CALL MEX
- MVI A,3 ;RETURN ABORT CODE
- RET
- SMNEXT: DCR C ;NO
- JNZ SMWLP ;CONTINUE
- ;
- ; ONE MINUTE WITH NO MODEM RESPONSE (OR NO CONNECTION)
- ;
- SMTIMO: MVI A,2 ;RETURN TIMEOUT CODE
- RET
- ;
- ; MODEM GAVE US A RESULT, CHECK IT
- ;
- SMTEST: ANI 7FH ;IGNORE ANY PARITY
- CALL SMANAL ;TEST THE RESULT
- MOV A,B ;A=RESULT (CY SIGNIFICANT HERE TOO)
- PUSH PSW ;SAVE IT
- SMTLP: MVI C,INMDM ;FLUSH ANY REMAINING COMMAND LINE
- CALL MEX
- JC SMCHEK ;JUMP IF NO INPUT
- CPI LF ;GOT SOME ... WAITING FOR EOL
- JNZ SMTLP ;EAT ANY IN-BETWEEN
- SMCHEK: POP PSW ;A HAS MEX RETURN-CODE, CY=1 IF UNKNOWN
- JC RESULT ;IF RESULT UNKNOWN, IGNORE IT
- RET
- ;
- SMANAL: MVI B,0 ;PREP CONNECT CODE
- CPI '*' ;"CONNECT"? (NEC "*ON LINE*")
- RZ
-
- INR B ;PREP BUSY CODE B=1
- CPI 'U'
- RZ
-
- INR B ;PREP NO CONNECT MSG B=2
- CPI 'O' ;N=NO CONNECT (NEC "AB'O'RT")
- RZ
-
- MVI B,4 ;PREP MODEM ERROR
- CPI 'O' ;E=ERROR (NEC "AB'O'RT")
- RZ
-
- STC ;UNKNOWN...
- RET
- ;
- RING: PUSH B ; is that the phone ?
- MVI C,ILP
- CALL MEX
- DB 'Ringing... ',0
- POP B
- RET ; go back & find if successful
- ;
- ; FOLLOWING ROUTINE DISCONNECTS THE MODEM USING SMARTMODEM
- ; CODES. ALL REGISTERS ARE AVAILABLE FOR THIS FUNCTION.
- ; NOTHING RETURNED TO CALLER.
- ; This is not used in this implementation. However, if you do
- ; not use DTR to disconnect and you want to use this routine
- ; set the disconnect code in the NEC modem to this string (+++ath)
- ; or to whatever other string you desire. Be sure to change the
- ; string here to match the one you set in the modem.
- ;
- IF DISC
- ;
- DISCON: MVI B,20
- MVI C,TIMER ;WAIT 2 SECONDS
- CALL MEX
- LXI H,SMATN ;SEND '+++'
- CALL SMSEND
- MVI B,20 ;WAIT 2 MORE SECONDS
- MVI C,TIMER
- CALL MEX
- LXI H,SMDISC ;SEND 'ATH'
- CALL SMSEND
- MVI B,1 ;WAIT 1 SECOND
- MVI C,TIMER
- CALL MEX
- RET
- ;
- SMATN: DB '+++',0
- SMDISC: DB 'ATH',CR,0
- ;
- ENDIF
- ;
- ; SMARTMODEM UTILITY ROUTINE: SEND STRING TO MODEM
- ;
- SMSEND: MVI C,SNDRDY ;WAIT FOR MODEM READY
- CALL MEX
- JNZ SMSEND
- MOV A,M ;FETCH NEXT CHARACTER
- INX H
- ORA A ;END?
- RZ ;DONE IF SO
- MOV B,A ;NO, POSITION FOR SENDING
- MVI C,SNDCHR ;NOPE, SEND THE CHARACTER
- CALL MEX
- JMP SMSEND
- ;
- ; DATA AREA
- ;
- DIALBF: DS 52 ;2 * 24 CHAR MAX, + CR + NULL + SLOP
- DIALPT: DS 2 ;DIAL POSITION POINTER
- ;
- END