From: "Charles Sandmann" 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 Precedence: bulk > 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.