Newsgroups: comp.sys.ibm.pc
Path: utzoo!utgpu!cunews!bcars8!bnrgate!bigsur!bcars53!mussar
From: mussar@bcars53.uucp (G. Mussar)
Subject: Re: 8087 Coprocessor
Message-ID: <1990Jul11.172043.525@bigsur.uucp>
Sender: news@bigsur.uucp (Usenet)
Organization: Bell-Northern Research, Ottawa, Canada
References: <169@evtprp0b.UUCP>
Date: Wed, 11 Jul 90 17:20:43 GMT

In article <169@evtprp0b.UUCP> tea6219@evtprp0b (Terry E. Acker) writes:
>I have an XT with a V20 processor running at 8/4.77Mtz.  What speed
>coprocessor do I need.  If there are different speed 8087s, can I
>use a 4.77Mtz 8087 and set the system speed to 4.77?  What if I run
>the system at 8Mtz with a 4.77Mtz 8087?  Will it work?  Will it
>overheat?

If you plan on always running at 4.77 MHz, no problem. If you switch to 8 MHz,
chances are the system won't even boot/run. This is based on trying the same
experiment with a 4.77/10 MHz XT. YMVM. Even if if does boot/run, the 8087
(which normally runs pretty warm) will run VERY hot and this will decrease its
life significantly.
--
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