Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!elroy.jpl.nasa.gov!jarthur!nntp-server.caltech.edu!josephc
From: josephc@nntp-server.caltech.edu (Simplelogic)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: 287 in a 386-33 system?
Message-ID: <1991Feb21.033602.9676@nntp-server.caltech.edu>
Date: 21 Feb 91 03:36:02 GMT
References: <1991Feb19.080902.21887@amd.com> <1670@pdxgate.UUCP>
Organization: California Institute of Technology, Pasadena
Lines: 28

mwizard@eecs.cs.pdx.edu (Craig Nelson) writes:

>indra@brahms.amd.com (Indra Singhal) writes:
>>Do 386 machines have a socket that allow using a 287?
>>For a 33 Mhz 386 machine, what speed 287 should be used?
>>Thanks!

>	Hate to say it, but you get the prize of forking over some rude cash
>if you want a 387 for that machine.   80387DX Coprocessors run bucks.  And No,
>to my knowledge jamming a 287 in just won't work.  No Slot, wrong speed, get
>the picture ?

Not true.

I have a 386-25 system that runs an 8MHz 287 as a "cheap way out" for those
who don't want to spend the money for a more expensive 387, running at
full system speed.

(Cyrix 287 compatible are $99 each!  Yeah!)

BTW, more andmore motherboards I'm seeing have dual co-processor sockets (one
for 287, one for 387; or 387/Weitek combo, though that's more exotic...)


-- 
Joseph I. Chiu, Department of Computer Science, Calif. Inst. of Technology
1-57 Fleming House, Caltech, Pasadena 91126.   (818) 585-0393
josephc@coil.caltech.edu               ...Just another lost soul in the universe