From:	"Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: help! FPU emulation worries... (RHIDE?)
Date:	Thu, 15 May 1997 22:18:37
Organization:	Aspen Technology, Inc.
Lines:	7
Message-ID:	<337b8bbd.sandmann@clio.rice.edu>
References:	<337B82CA DOT 1A7 AT blackmagic DOT tait DOT co DOT nz>
Reply-To:	sandmann AT clio DOT rice DOT edu
NNTP-Posting-Host:	spica.dmccorp.com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

> I'm not certain, but I thing that setting the EM bit in cr0 has the same
> effect on a 486 as a 386, causeing fp code to generate exceptions.  The
> problem then becomes setting this bit when your code is in ring 3.

This is a DPMI 1.0 extension supported on almost all DPMI hosts (even most
MS Win stuff).  a "SET 387=N" should force this behavior.  See the source
for more details.

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