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From: grege@gold.GVG.TEK.COM (Greg Ebert)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: AMD's 80C287
Message-ID: <1144@gold.GVG.TEK.COM>
Date: 6 Jul 90 15:41:51 GMT
References: <2347@mindlink.UUCP> <837@lee.SEAS.UCLA.EDU>
Organization: Grass Valley Group, Grass Valley, CA
Lines: 16

In article <837@lee.SEAS.UCLA.EDU> kislik@boole.seas.ucla.edu (Maxim Kislik/;093090) writes:
>I remember that some 386s can handle a 287 as a co-processor.
>How can I tell whether I can or cannot do this?
>

According to my Intel databook, an 80287 is a 40-pin DIP device, and the
80387 is a pin grid array (PGA) device. So, I'd just look at the sockets.
An 80387 has 2 'rows' of pins which form a square; don't confuse it with a
socket for a Weitek, which is larger.

When I was at AST Research, I seem to recall our first '386 system had a
socket for an 80287.

The 80386 has an internal mode bit which tells it to run 16-bit (80287)
cycles or 32-bit (80387) coprocessor access cycles. Your setup utility MUST
have some sort of selection for this.