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From: JEB6589@RITVAXB.BITNET
Newsgroups: net.micro.atari8
Subject: Re: atari serial interface info wanted
Message-ID: <8603180135.AA20721@ucbvax.berkeley.edu>
Date: Mon, 17-Mar-86 20:36:49 EST
Article-I.D.: ucbvax.8603180135.AA20721
Posted: Mon Mar 17 20:36:49 1986
Date-Received: Wed, 19-Mar-86 01:00:36 EST
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Organization: The ARPA Internet
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     I have the R-Verter interface, you mentioned.  It is a very simple
interface and does not support true RS-232 levels.  Most manufactures consider
0 volts a logic 1 and +5 a logic 0 so they can get away with this.  The RS-232
standard states that a logic 1 is -5 to -15 volts and a logic 0 is +5 to +15
volts.  So consequently the R-verter is not compatible with every modem along
with the fact it does NOT support DTR.  Also the 850 and P:R: connection allow
the daisy chaining of peripherals, while the R-verter doesn't.  The U-call
interface from digital devices I am not sure about.  I am a member of DELPHI
and there has been alot of discussion of the compatability of the P:R: Connectio
n
and the 850, it is 100% CIO compatible, not SIO though, as this would cause
copyright infringement, or so the discussion goes.

                                        Jim Berg
                                        Jeb6589@ritvaxc.BITNET