[comp.windows.ms.programmer] 8387 & Windows & DOS Box

ebergman@isis.cs.du.edu (Eric Bergman-Terrell) (04/15/91)

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