From: Richard.Town@f235.n254.z2.gryn.org (Richard Town)
Newsgroups: trends.fido.hs-modems
Subject: RPI/WinRPI modems
Organization: Another message via PackLink +44(0)1812972486
 -=> Quoting Disen Abella to All <=-
 DA> I've seen some modems which mention RPI or WinRPI.
 DA> What advantages do these modems offer?
RPI (the old style) or RPI+ stands for Rockwell Protocol Interface.
These modems will only work with the supplied terminal program
(often COMit for DOS) or with written for Windows comms programs
in Windows.  Telix for Windows, QModem Pro when registered, etc
The RPI+ does the error correction and data compression in your
software using your computer's CPU.  For Windows operation you
would use a special driver collectively known as a WinRPI driver.
There are several of these for Win3.1, 3.11, WfWG3.11, and Win'95
 DA> Seem to be something to do
 DA> with running better under Windows?
They are a bit faster than standard modems because they use the
virtual comport that is made by the WinRPI program which interfaces
directly with Window's comms routines.  For text transfers they can
be much faster since they're not restricted to the 115k2 port speed
because there's no "port" (just a virtualised one)
Latest V34Plus Zooms offer both standard hardware error correction
and datacompression, and RPI+ methods, controlled by init string, all
at V34 speeds
For an RPI+ only modem use +H0 at the end of init if you have to
operate one from DOS or in a DOS box.  It won't give you EC/DC but
at least it will work.  Most RPI modems found around tho are 14k4 max
rgdZ
Richard
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