A5000 serial port

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#757

From: George Taylor
Date: Mon, 25 Jan 1993 13:47

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Further to my previous posting concerning my record of faulty serial ports, I now
have my machine back and working.

The engineer at Norwhich Computer Services reports
that the serial driver chip had suffered static damage (the driver chip is a CMOS
device which uses a charge pump to create the +/- RS232 voltages).
He suggests extreme care be taken with the port and that screened (hence earthing
from one machine's chasis to another) leads and plugs should always be used.
I would have thought that given the typical nature of serial port use (noisy
environments etc) that CMOS drivers are a bad idea, I intend to make up my own
buffer to protect my port. I have never heard of this problem occuring on
other euqipment using serial ports.

-- 
George

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From: gst@dcs.ed.ac.uk (George Taylor)
Newsgroups: comp.sys.acorn.tech
Subject: A5000 serial port
Message-ID: <C1Ewyx.2ny@dcs.ed.ac.uk>
Date: 25 Jan 93 13:47:21 GMT
Sender: cnews@dcs.ed.ac.uk (UseNet News Admin)
Organization: Department of Computer Science, University of Edinburgh
Lines: 15