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Date:      Tue, 5 Nov 1996 18:44:28 -0500 (EST)
From:      cau@cc.gatech.edu (Carlos Ugarte)
To:        pechter@shell.monmouth.com (Bill/Carolyn Pechter)
Cc:        dwlewis@intervista.com, FreeBSD-questions@freebsd.org
Subject:   Re: Cyrix vs. Intel
Message-ID:  <199611052344.SAA08125@oscar.cc.gatech.edu>
In-Reply-To: <199611051442.JAA15608@shell.monmouth.com> from "Bill/Carolyn Pechter" at Nov 5, 96 09:42:32 am

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> Well, my VESA motherboard came with the Cyrix chip -- (the 586-100) -- but
> the board wouldn't run with the 586.  The problem was it would recognize
> and identify the Adaptec 1542 controller and SCSI drives -- but wouldn't 
> read/write the busmastering controller.  IT worked fine with the IDE
> C: drive (dos/os2).  I dropped a 486/DX2 66 in and it all works.
> With internal and external cache off -- it worked SLOWLY... and not from the
> OS/2 boot mgr...

I had the same problem, but I believe the blame lies with the
manufacturer of the motherboard and not Cyrix.  In my case, the
motherboard was even listed as one of the "golden" certified
mobo's for the 5x86...  Basically, it didn't like the combination
of a high bus/CPU speed, a DMA busmaster (1542CF), and a write back
cache.  Lowering the bus speed from 40 MHz to 33 MHz (and thus
the CPU from 120 MHz to 100 MHz) was one way to get around it.
Disabling the cache (ugh!  might as well use a 486-33...) was
another.

Carlos

-- 
Carlos A. Ugarte                                cau@cc.gatech.edu
Author of PageMage, a virtual desktop util for OS/2
http://www.cc.gatech.edu/people/home/cau/
If you understand what you're doing, you are not learning anything



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