TOPIC :  MDM712 PHONE MODEM PROGRAM GENERAL INTEREST DATA

FROM  :  IRV HOFF W6FFC

DATE  :  27 JULY 83


     MDM712 is the latest in the "MODEM7" telephone modem series.  After
MODEM 7.98, the program became known as MDM700, etc.  At that time the
external macro library was combined into the source code plus other
changes.  Numerous overlay files were added for various computers to
make the program useful for a large number of different systems.  Orig-
inally it worked only with the PMMI plug-in modem for the S-100 bus.  It
now also supports the Hayes 300 and 1200 and U. S. Robotics modems.  It
is the only modem program that offers auto-dialing and auto-continuous
redialing for all these modems.  It also supports up to two different
alternate long distance systems such as 'ALLNET', 'MCI' or 'SPRINT'.  It
can auto-dial for TYMNET, etc.

     Overlay files are included in MDM712.LBR for Apple, (several ver-
sions), Altos, Datapoint 1560, Heath H89, Heath -100 series, Hewlett
Packard 125, Interfacer 3/4, Kaypro, Morrow, NEC, Osborne OS-1, Osborne
Executive One, Otrona, PMMI, Telecon Zorba, Televideo, Xerox and Zenith
Z90 and -100 series.  There is also a "general purpose" overlay to read-
ily adapt to other systems not mentioned.  An additional file makes it
simple to change the phone number library.  (This file also provides ac-
cess to the alternate long distance dialing systems.)  Others are being
added that may not be mentioned in this list.

     The MDM712.UPD file lists the most recent changes that have been
added to the program.  This is in the MDM712.LBR group.  There are many
overlay files for various computers and one additional file for easily
changing the phone number library.  MDM712.INF explains what each of
the programs is for, plus has some comments similar to these, regarding
how to use the overlays in the easiest manner.   Under normal circum-
stances you would have no need for the source code, as the overlays have
the beginning of the program.  This includes all the various options you
may select.

     Let's say you have a Heath H89, for example.  You would wish to get
(download) the following files from that library group:

     MDM712.COM		(Master object code, ready to use for PMMI)
     M712H8.AQM		(Heath overlay file)
     M712NM.AQM		(to easily change the phone number library and
			   access the alternate long distance systems if
			   using the Smartmodem or Robotics)

and perhaps MDM712.UQD (update file) and MDM712.DQC (instruction manual):
 
     You would unsqueeze M712H8.AQM, edit the options if not set the
way you prefer, then assemble it (ASM.COM is fine).  Refer to the in-
structions in the overlay file to combine the MDM712.COM file with the
M712H8.HEX file you just got when assembling M712H8.ASM.  All this will
only take a few minutes.   It is actually very simple.  The program is
then ready to use.  If unfamilar with this type modem program, read the
MDM712.DOC file and try it out.

     0103H  FF for PMMI, 00 if not PMMI
     0104H  FF for Hayes Smartmodem 300 or 1200 or US Robotics
     0105H  54 for touch-tone dialing or 50 for pulse-dialing
                   (only applicable for the Hayes or Robotics)	

     These bytes are automatically selected when edited into the approp-
riate overlay.

========================================================================

      If you have never downloaded a particular file from a library
      group, you can do it this way:  Use LDIR to see what is in the
      library:

B>LDIR MDM712   	      	shows contents of the .LBR group
B>LTYPE MDM712 MDM712.UQD  	displays MDM712.UPD update file
B>XMODEM L MDM712 MDM712.COM	downloads the  .COM file only

					- Irv Hoff