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From: notes@isucs1.UUCP
Newsgroups: net.micro
Subject: Re: Re: 1200 buad modem designs wanted
Message-ID: <273@isucs1.UUCP>
Date: Sun, 27-Jan-85 02:01:27 EST
Article-I.D.: isucs1.273
Posted: Sun Jan 27 02:01:27 1985
Date-Received: Mon, 4-Feb-85 04:44:22 EST
Sender: notes@isucs1.UUCP
Organization: Iowa State University
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Nf-ID: #R:fortune:-466000:isucs1:9500002:000:768
Nf-From: isucs1!drew    Jan 22 18:02:00 1985

Exar also offers a 1200-baud modem chip set.  They also publish an application
note that gives a schematic diagram for a auto-sense 300/1200-baud modem.
You could connect it to the phone line through a simple acoustic coupler
(Ciarcia, in his Circuit Cellar article, "A Build-it-yourself Modem for Under 
$50", shows such a setup) or a direct-connect setup.

I once priced components for such a modem (with acoustic coupler).  You should
be able to build it (if you have sufficient technical knowledge and ability)
for about $200-$250.  You can write Exar at:

                       Exar Integrated Systems
                       750 Palomar Avenue
                       Sunnyvale CA 94088
                       (408) 732-7970

Hope this will be able to help you.