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From: danm@mspiggy (Dan McCabe)
Newsgroups: net.micro.6809
Subject: Re: Re: Using /t1 on CoCo - (nf)
Message-ID: <125@mspiggy>
Date: Wed, 18-Jan-84 15:27:10 EST
Article-I.D.: mspiggy.125
Posted: Wed Jan 18 15:27:10 1984
Date-Received: Sat, 21-Jan-84 23:16:24 EST
References: <4932@uiucdcs.UUCP>
Organization: Microsoft, Bellevue, WA
Lines: 21

It has been suggested at one of the meetings of a Motorola User's Group
which I attend that you can run at 9600 baud by using the fourth line
(the others are Signal Ground, Transmit Data, and Receive Data) to interrupt
the processor when data is received.  Radio Shack calls this line their
Carrier Detect line, which is normally generated by modems when the
carrier is detected (makes sense).  However, this line is connected to
one of the interruptable inputs of one of the PIA's in the CoCo.  With
proper signal conditioning (convert RS-232 levels to TTL), the Recieve Data
line could be connected to this line and interrupt the processor when
the start bit is recieved.

Of course, this means that you will need to write a new RS232 module, as
well as design some hardware (however minimal).

					Happy hacking,
					Dan McCabe
					decvax!microsoft!danm

Disclaimer:  I haven't tried this method, so try it at your own risk.
However, it does sound like a reasonable technique;  if it wasn't, I wouldn't
have suggested it.