10-17-94                         RPI

     RPI= Rockwell Protocol Interface. (for the AFC/X,AMC/X,Pocket and some
14.4 modems).  There is a V42bis.DRV file on the diskette, and the Software
must  recognise RPI for it to Interface that with the modem.  Any  software
that  reconises  RPI  will have a driver included and a place  to  set  the
software  protocol in the Setup. RPI based modems use Xon/Xoff, do not  use
RTS/CTS  (except 14.4 models), it too is RPI controlled. Always  set  modem
speed  to 2400 (19,200 for 14.4 models). RPI is fast and you will  not  see
any speed difference fro using ROM v42bis.

>>>   If you are having trouble connecting, in any program that  uses  RPI,
just set the entry of the phone directory to NONE (not to MNP/V42) or  turn
off  software  protocol in the setup to turn off protocol. There is  no  AT
Command to do it.

 Use the standard Hayes init string   AT&F&C1&D2  for these modems.

     If  the program does not support RPI, do NOT set any MNP  or  V42(bis)
options. It will work as a plain modem (Hayes/generic 2400 or 9600/14.4).

     If  you are sending primarily ZIP (compressed) files,  V42bis  doesn't
help  anyway.  If  you are  sending  uncompressed  documents,  spreadheets,
databases,  then  V42bis will speed transfer. If you can't use one  of  the
comm programs below, you may be better off with a hardware V42bis model.

     There  are  not very many comm programs that suport  RPI  for  V42bis.
Right now I know of 3. (in order of ease of use).

Comit - by Tradewind - 818-335-7007 (Dos & Windows)
Bitcom Deluxe - Bit Software - 510-490-2928
MTEZ/WPCOM- from Wordperfect - 801-228-9915
*Procomm 2.x Plus for Windows       (* Zoom has not tested)
*Crosstalk

     NOTE: If you need modem-based V42bis the cheapest Zoom modems w/V42bis
are  the VFPV32bis. They are often available below $150 at retail  or  mail
order. Sorry, we cannot upgrade any RPI modems to v42bis.

     FAX NOTE: RPI based modems are Class-1 FAX. They will send at 9600 but
only rec'v fax at 4800.

                                               Don Hinds - Zoom Tech
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