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From: rfutscher@pbs.org
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: fastest 287?
Message-ID: <1991Mar22.132158.12126@pbs.org>
Date: 22 Mar 91 18:21:58 GMT
References: <1991Mar17.222637.4437@en.ecn.purdue.edu>
Organization: PBS:Public Broadcasting Service, Alexandria, VA
Lines: 25

In article <1991Mar17.222637.4437@en.ecn.purdue.edu>, stevew@en.ecn.purdue.edu (Steven L Wootton) writes:
>
> I've decided to put together the 80287 Socket Rocket described in the April
> 1991 issue of ComputerCraft Magazine.  This will be done purely for its
> experimental value.  To that end, I need to know a couple of things about
> 80287 floating-point processesors.
>
> First, I would like to use the most efficient 287 out there.  There are
> three major contenders for the project (that I know of):
>
> Intel 80287 XL  ($185)
> IIT   2c87-20   ($190)
> AMD   80287     ($100)
>
 MUCH DELEATED

I have a IIT 10 mhz 287. It is running from a 32 mhz clock that is
devided by three for 10 mhz. Because of the devide by three the duty
cycle is not 50-50. When I run the tests on it, it fails the modes that
that were added by IIT. I think they are matrix functions. The boxes
that are drawn on the screen lack x values. As if zero is returned as
answers. The boxes are just a series of verital lines centered on the screen.
No smoke, no flames.

  Robert Futscher  rfutscher@pbs.org