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From: rex@otto.COM (Rex Jolliff)
Newsgroups: comp.sys.m6809
Subject: RS-232 port: hardware or sotfware?
Message-ID: <500@otto.COM>
Date: Sat, 18-Jul-87 08:34:07 EDT
Article-I.D.: otto.500
Posted: Sat Jul 18 08:34:07 1987
Date-Received: Sun, 19-Jul-87 19:54:45 EDT
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Reply-To: rex@otto.UUCP (Rex Jolliff)
Organization: Las Vegas Sun
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I was thinking of buying a coco (2 or 3) and I was wondering if the rs-232 port
is all hardware or if any of it is implemented in software.  Let me clarify
this.  I own a Commodore-64, and it's rs-232 port is set up as follows: an
8-bit parellel port is used, and each of the rs-232 pins, including the TxD and
RxD, are driven by a line coming off the parellel port.  A piece of software is
tied to the NMI vector and the timer is loaded with a value that comes as close
as they could to the actual baud rate. This doesn't really work at all past
1200 baud, and not even that good at 1200 baud.  I would rather not buy another
computer with a kludge like this, and if coco's have a HARDWARE UART, I would
like to know.  This probably is'nt in everybodies interest, so E-mail replies.

                                                            Rex.
-- 

Rex Jolliff  (rex@otto.UUCP, {akgua,ihnp4,mirror,sdcrdcf}!otto!rex)
The Sun Newspaper -            |Disclaimer:  The opinions and comments in
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