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From: ebergman@isis.cs.du.edu (Eric Bergman-Terrell)
Newsgroups: comp.windows.ms,comp.windows.ms.programmer
Subject: 8387 & Windows & DOS Box
Message-ID: <1991Apr15.061129.19851@mnemosyne.cs.du.edu>
Date: 15 Apr 91 06:11:29 GMT
Sender: usenet@mnemosyne.cs.du.edu (netnews admin account)
Reply-To: ebergman@isis.cs.du.edu (Eric Bergman-Terrell)
Organization: Nyx, Public Access Unix (sponsored by U. of Denver Math/CS dept.)
Lines: 16
Disclaimer1: Nyx is a public access Unix system run by the University of Denver
Disclaimer2: for the Denver community.  The University has neither control over
Disclaimer3: nor responsibility for the opinions of users.


I have a 386SX with a 387SX math chip.  I'm developing a program that does
a lot of floating point math.  Whenever I have my (Windows) program active,
and then select the dos box, and then return from dos, the Windows program
gets a UAE and stops.

I can repeat this behavior with the Windows calculator accessory - when I'm
using the calculator & go to dos, when I return often the calculator program
gets a UAE and stops.

So now the question:  Is this a (known?) bug in Windows?  Is there a 
workaround?  Or perhaps my configuration needs some modifications?  Does this
happen even without having a coprocessor installed?


Terrell