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From: mjg@ecsvax.UUCP (Michael Gingell)
Newsgroups: net.micro.pc
Subject: Re: Running IBM serial boards at 19.2KB
Message-ID: <1141@ecsvax.UUCP>
Date: Fri, 3-May-85 10:17:52 EDT
Article-I.D.: ecsvax.1141
Posted: Fri May  3 10:17:52 1985
Date-Received: Mon, 6-May-85 00:11:53 EDT
References: <145@cernvax.UUCP> <138@omen.UUCP> <535@cyb-eng.UUCP>, <122@kontron.UUCP>
Organization: NC Educational Computing Service
Lines: 15


Warning! Running your IBM PCs serial port at 19200 may be hazardous
to it's health!. I am just passing this on but I am reliably informed
that the reason IBM does not specify serial operation at 19.2 is that
it is under some circumstances possible to burn out the UART chip.
The reason may be that internal currents in MOS curcuits are often
directly related to switching frequency.

This is not to say you can't do it, in fact I have linked my PC to my
Data General One at 19200 baud and got away with it .. but for how long
that will last I don't know. Data General has a program for c
communicating to the PC which works up to 19200 baud but they reccomend
only using at 9600 for this very reason.

Mike Gingell,  ITT Raleigh, NC (919) 878 8100  ..decvax!mcnc!ecsvax!mjg