TOPIC :  MODEM708 PHONE MODEM GENERAL INTEREST DATA

FROM  :  IRV HOFF W6FFC

DATE  :  15 MAY 83


     MDM708 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.  Also numerous overlay files were added for various computers
to make the program useful for a large number different systems.  It was
originally made to work only with the S-100 bus and plug-in PMMI modem.

     Overlay files are included in MDM708.LBR for Apple, Datapoint, Os-
borne, Kaypro, PMMI, Heath H89, Zenith 100-series, TeleVideo and Xerox.
There is also a "general purpose" overlay which should allow others to
adapt their equipment readily.  It has already been used for a Morrow
computer and a DEC Rainbow computer.

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     MDM708 has numerous changes over previous programs.  A list of those
changes is in the library group called MDM708.LBR under the file named
MDM708.UQD  (MDM708.UPD unsqueezed) which is an "update file".  That
same library group contains 10 overlay files for various computers and
one overlay file for easily changing the phone number library.  A file
in the library called MDM708.IQF 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.

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

     MDM708H8.AQM	(Heath overlay file)
     MDM708.COM		(Master Object code, ready to use for PMMI)
     MDM708.DQC		(Squeezed instruction guide)

and perhaps the update file:
 
     MDM708.UQD     

     You would then unsqueeze MDM708H8.AQM, check the options to see if
they are set the way you prefer, then assemble it (ASM.COM is fine). You
woudl then refer to the instructions at the start of the overlay file to
combine the MDM708.COM file with the MDM708H8.HEX file you get when as-
sembling the MDM708H8.ASM file.  All that won't take even 2-3 minutes.
It is actually very simple and good instructions are provided.  The
program is then ready to use.

     Again it is the latest in the "MODEM7" series, although now called
MDM708.

     At present we are working to adapt the program to the Hayes Smart-
modem 300/1200 with minimal changes.  We hope the same overlay files
may perhaps be used with a different  SMDM708.COM file. 

                                          - Irv Hoff


P.S.  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 MDM708   <ret>      shows contents of the .LBR group
B>LTYPE MDM708 MDM708.UQD  types the MDM708.UQD file for your inspection
B>XMODEM L MDM708 MDM708.COM   downloads the  .COM file only

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