Xref: utzoo misc.forsale:1737 comp.sys.ibm.pc:17009 Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!mailrus!tut.cis.ohio-state.edu!osu-cis!att!lzaz!lznv!psc From: psc@lznv.ATT.COM (Paul S. R. Chisholm) Newsgroups: misc.forsale,comp.sys.ibm.pc Subject: Re: Intel Coprocessors for sale Summary: 5 MHz 8087-3 won't work in PS/2-25 or -30; too slow Keywords: 8087 80287 IBM Message-ID: <1400@lznv.ATT.COM> Date: 6 Jul 88 19:27:36 GMT References: <143@celerity.UUCP> Distribution: na Organization: AT&T Lines: 24 < "Would you buy a used operating system from these guys?" > In article <143@celerity.UUCP>, tester@celerity.UUCP (tester) writes: > FOR SALE FOR SALE FOR SALE >... > 8087-3 $50 >... > The 8087 is designed to work at 5MHZ. >... > For the uninformed: the 8087 is designed to be used in an IBM PC/XT or > PS/2 models 25 and 30 and compatibles. (PS/2-25 compatibles?-) Um, no. For a system with an 8 MHz 8088 or 8086 (e.g., AT&T PC 6300, original Compaq Deskpro, IBM PS/2 Models 25 and 30), you want an 8 MHz 8087-2. The 5 MHz 8087-3 is suitable for 4.77 MHz machines (PC and XT compatibles). That's a good price for an 8087-3, but if it doesn't work reliably in your (8 MHz) system, it's no bargain at any price. No, I *don't* know what speed a 8087-1 runs at. -Paul S. R. Chisholm, {ihnp4,cbosgd,allegra,rutgers}!mtune!lznv!psc AT&T Mail !psrchisholm, Internet psc@lznv.att.com I'm not speaking for my employer, I'm just speaking my mind.