HELP!! Floppies are corrupt when 486 CACHE is on?!

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#12106

From: Chris Miles
Date: Sun, 11 Sep 1994 03:27

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I have just upgraded a 386DX40 to a 486SX33 w/ VLB and an S3 video card.
I am running OS/2 on it.

I am having trouble getting the floppy drives [a 3.5" and a 5.25"] to work
properly in that data read from them appears to be getting corrupt.
I did a lot of testing before I decided that the floppies WERE actually
corrupting data [whether it be copying a file, running an executable, or
anything on the floppy].  OS/2 is not the problem, as it effects BOOTING
from a normal DOS disk as well.

I have found a CURE for the problem - I go into the BIOS, and DISABLE the
INTERNAL CPU CACHE.  When this is disabled, the floppies WORK FINE! 
[And the system is a LOT slower!]  If I enable the cache again, the floppies
corrupt data once again...

Can anyone explain what is happening here, and especially how to FIX this
strange problem, so that I can have the floppies working AND have the CPU
run at its full speed [ie: with the cache ON] !!??

I will be happy to supply any other info if it will help.

Thanks for any advice,

Chris.

csccm@lux.latrobe.edu.au

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Newsgroups: comp.sys.ibm.pc.misc,aus.computers.ibm-pc,comp.sys.ibm.ps2.hardware
Subject: HELP!!  Floppies are corrupt when 486 CACHE is on?!
Message-ID: <1994Sep11.032747.21542@lugb.latrobe.edu.au>
From: csccm@lux.latrobe.edu.au (Chris Miles)
Date: Sun, 11 Sep 1994 03:27:47 GMT
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