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.