Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!knapp
From: knapp@cs.utexas.edu (Edgar Knapp)
Newsgroups: comp.sys.mac
Subject: Re: 68882 vs. '881
Summary: They are pin-compatible
Keywords: FPU, 68881, 68882, pin-compatibility
Message-ID: <7896@cs.utexas.edu>
Date: 14 Feb 90 20:07:31 GMT
References: <651@runxtsa.runx.oz.au> <1514.25d95a24@csc.anu.oz> <1990Feb14.050221.16897@wam.umd.edu>
Distribution: usa
Organization: U. Texas CS Dept., Austin, Texas
Lines: 22

In article <1990Feb14.050221.16897@wam.umd.edu> ddev@wam.umd.edu (Don DeVoe) writes:
>
>    Can anyone tell me if the 68882 and '881 are pin compatible?  I recently
>obtained an '882, and I hope to replace my mac II's '881 with it.  What I
>need to know is A) will this switch work?  B) Will I see any real performance
>improvement?  I kinda-sorta recall hearing that the '882 will work in a
>mac II, but I don't really feel like risking my motherboard on it.  
[..]

I have been running a 20 MHz 68882 for two months. It works without a
hitch, and you do notice a performance gain, especially in programs
like Mathematica that use the floating point chip heavily.

By the way, I have both a 20 MHz and a 25 MHz MC68882 for sale ($150.-
and $200.- respectively). Also, if someone wants my old 16 MHz MC68881
to use in an accelerator board it can be had for $50.-.

Edgar

(knapp@cs.utexas.edu)