Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!wuarchive!uunet!munnari.oz.au!csource!david
From: david@csource.oz.au (david nugent)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Serial input under DesqView
Keywords: DesqView interrupts serial
Message-ID: <769@csource.oz.au>
Date: 20 Dec 90 14:23:06 GMT
References: <1990Dec11.032154.18383@dms3b1.uucp> <1990Dec12.190108.15079@Octopus.COM>
Organization: Unique Computing Pty Ltd, Melb, Aust.
Lines: 24

In <1990Dec12.190108.15079@Octopus.COM> stever@Octopus.COM (Steve Resnick ) writes:

> >Here's my situation:  I have a program that takes serial input at
> >19200 baud.  By experimentation, I've determined that, with code in
> >the interrupt service loop, I can spare about an additional 250 microsec.
> >of delay in the interrupt response before risking occasional overruns.
> >(This is running on a 25 MHz 386 in real mode.)  

> DESQview does disable interrupts during a task switch - it HAS to.


.. and of course the short solution is to get a better serial chip and
upgrade the software to take advantage of it. Namely, the NS16550A.

BTW, has anyone heard of the release of a 16650?  I've heard the same
thing now for two sources but haven't had any firm confirmation yet.


   david
   
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