Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!samsung!think.com!snorkelwacker.mit.edu!bloom-beacon!eru!hagbard!sunic!fuug!tuura!risto
From: risto@tuura.UUCP (Risto Lankinen)
Newsgroups: comp.sys.intel
Subject: Re: 287 on a 386 machine
Message-ID: <916@tuura.UUCP>
Date: 9 Jan 91 14:56:17 GMT
References: <1991Jan9.004654.21586@research.canon.oz.au>
Organization: Nokia Data Systems Oy
Lines: 28

graeme@research.canon.oz.au (Graeme Wong See) writes:



>I was recently in a computer store where I saw a brochure for a 386
>motherboard (can't remember if it was a DX or SX motherboard) from Taiwan.
>In the specs under coprocessors it says that it can take either a 
>287 or a 387 maths coprocessor. Is this at all possible with either a DX or SX?
>Perhaps it is a typo but any clarification on the matter will be helpful.

Hi!

It's true; a friend of mine has a Finnish-made Nokia AWS/386 with *2*87, and
it runs fine.

The socket is a bit peculiar:  There are pin holes in square arrangement for
80387, and in two parallel rows for 80287, some of which are shared at the
same place.  Also, the 287 is 2/3 the frq of the CPU (like 12 MHz <-> 16 MHz)
as it often is with 287.

I don't know how much speed would be gained by using 387 instead.

Terveisin: Risto Lankinen
-- 
Risto Lankinen / product specialist ***************************************
Nokia Data Systems, Technology Dept *  2                              2   *
THIS SPACE INTENTIONALLY LEFT BLANK * 2 -1 is PRIME!  Now working on 2 +1 *
replies: risto@yj.data.nokia.fi     ***************************************