Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!mailrus!uunet!convex!rigel!harper
From: harper@rigel.uucp (David Harper)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 80387 problems: HELP!
Message-ID: <4600@convex.UUCP>
Date: 15 Jan 90 13:23:50 GMT
References: <3737@jarthur.Claremont.EDU>
Sender: news@convex.UUCP
Reply-To: harper@convex.COM (David Harper)
Distribution: na
Organization: Convex Computer Corporation, Richardson, Tx.
Lines: 24

In article <3737@jarthur.Claremont.EDU> paul@jarthur.Claremont.EDU (Paul Thiessen) writes:
>Hello all.
>  I just bought and installed a new 80387 chip. However, it didn't work.
>properly...)
>  I was wondering if anyone knows of any compatibility problems with the
>following system:
>
>  Micronics 25-MHz motherboard, 32K Cache, Intel cache controller
>  80386 DX, 80387 DX, both rated 25 MHz
>  Phoenix BIOS

I have this exact same combination and I too had problems initially installing
the 80387.  In my case the problem was due to the fact that I "assumed" that
pin 1 on a jumper controlling 80387 operation was in the same orientation as
pin 1 on all the chips.  If fact, it was just the opposite.  I have seen a
recent version of the Micronics 25 MHz motherboard (mine is about 6 months
old) and it had a slightly different layout so they may have fixed this
"problem".  In any case, you might want to experiment with various jumper
combinations.  


Dave Harper    -     Convex Computer Corp.            E-mail address:
3000 Waterview Pky.  Richardson, TX 75081             harper@convex.COM
(214) 497-4525 (W)   (214) 727-4206 (H)