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From: robert@gitpyr.UUCP (Robert Viduya)
Newsgroups: net.micro.pc
Subject: Re: Running IBM serial boards at 19.2KB
Message-ID: <331@gitpyr.UUCP>
Date: Sun, 21-Apr-85 07:21:14 EST
Article-I.D.: gitpyr.331
Posted: Sun Apr 21 07:21:14 1985
Date-Received: Mon, 22-Apr-85 02:15:06 EST
References: <145@cernvax.UUCP> <138@omen.UUCP> <535@cyb-eng.UUCP>
Distribution: net.micro.pc
Organization: Georgia Tech, Atlanta
Lines: 24

> > The standard IBM serial adapter using the 8250 UART, as well as the
> > serial ports on expansion boards such as AST SIXPACK can be programmed
> > for 19200 and 38400 bits per second.
> 
> Huh?  I quote from page 1-238 of the I.B.M. PC2 Technical Reference manual:
> 
> 	Note:  The maximum operating frequency of the baud generator is
> 	3.1MHz.  In no case should the data rate be greater than 9600 baud.
> 

To bring a real-life application into the argument, I've written a comm-
unication program for the PC that can handle 19200 baud with no errors
or dropped characters.  This was using the standard IBM Async card.
Now, of course, it had to have XOn/XOff flow-control to work properly
(just can't write to that screen fast enough), but it was 19200.  You
also can't tell the difference between 9600 baud and 19200 baud.

			robert
-- 
Robert Viduya
Georgia Institute of Technology

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