Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!pacbell.com!ucsd!mvb.saic.com!dayton.saic.com!valinor!stu From: stu@valinor.UUCP (Stuart L Labovitz) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: 80387 25MHz & 33MHz Questions (Was : 80387 25MHz question) Message-ID: Date: 27 Apr 91 02:46:36 GMT References: <1991Apr24.165319.3600@digi.lonestar.org> Distribution: na Organization: What? Organized?? Lines: 27 jgay@digi.lonestar.org (john gay) writes: > > I think that most of the speed gained by the Weitek coprocessor is because > it is memory mapped. The new Cyrix memory mapped '387 is supposed to be > just as fast as the Weitek (or very close) and can be used as either > memory mapped or interrupt driven. There is an article about 386 coprocessor > in the May '91 Dr. Dobb's. Give it a read. > There is also an excellent review of the Cyrix EMC87, 83D87, and 83S87 (along with comparisons to the Intel 80486, 387DX, and 387SX) in the May 1991 issue of IEEE Software (pg 119-120). This review, entitled "Cyrix Chips Outperform Intel Math CoProcessors," was written by Sorel Reisman (reachable by e-mail at s.reisman@compmail.com) and discusses how the 80386 with a Cyrix co-processor can, generally speaking, be faster than the 80486 (!). Stuart L Labovitz home: stu%valinor.uucp@dayton.saic.com or stu@valinor.uucp or dayvb!valinor!stu work: slabovit@blackbird.afit.af.mil As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.