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From: bc@cyb-eng.UUCP (Bill Crews)
Newsgroups: net.micro.pc
Subject: Re: 19.2K bps from std serial card?
Message-ID: <693@cyb-eng.UUCP>
Date: Fri, 6-Sep-85 12:53:07 EDT
Article-I.D.: cyb-eng.693
Posted: Fri Sep  6 12:53:07 1985
Date-Received: Tue, 10-Sep-85 20:17:45 EDT
References: <2192QAA@psuvm> <322@sesame.UUCP>
Organization: Cyb Systems, Austin, TX
Lines: 20

> Yes, it is possible to get a standard pc's serial card to go up
> to 38.4 Kbps without any hardware modifications.  Most programs do
> not go beyond 9600 bps due to the fact that the pc's processor is
> too slow to process incoming data at that rate!  (There are exceptions,
> eg:Pro-Yam will run at 38.4 Kbps - it is largly a matter of how much
> overhead is in the interrupt service routines.  It doesn't take too
> much overhead before the I/O rate is outpacing the processor, thereby
> loosing characters).

Don't forget either that other software that you may be using might turn
interrupts off for periods of time that are unacceptable at those data rates.
If the communications package is designed to do this while only that package
is running, then fine.  But under Topview or a serial network, even 9.6Kbps
may not be reliably achievable.
-- 
  /  \    Bill Crews
 ( bc )   Cyb Systems, Inc
  \__/    Austin, Texas

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