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From: hd7x@vax5.cit.cornell.edu (Sanjay Aiyagari)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Computer slow since installation of SCSI drive
Message-ID: <1990Dec9.050509.1470@vax5.cit.cornell.edu>
Date: 9 Dec 90 09:05:09 GMT
References: <4076@mindlink.UUCP>
Distribution: comp
Lines: 20

In article <4076@mindlink.UUCP>, a516@mindlink.UUCP (Jordan Melville) writes:
> I recently got a new Quantum 210Meg SCSI drive, and notice that
> since I got the drive, the video output has been substantially
> slower (to a level where it is visibly noticeable, I can see screen
> updates lag behind what they used to). Norton's SI still returns
> the same values for processor speed, and the system gets the same
> MIPS value. Could the SCSI drive have anything to do with this?
> It's running on a Future Domain SCSI controller (model TMC-885),
> inside of a 20Mhz 386 machine. I'm using ATI's VGAWonder card. The
> drive is partitioned with the software provided with the drive with
> two 105Meg separations. I am loading the dmdrvr.bin program that
> came with it.

This sounds strange, but one possibility (I'm not sure but it is possible) is
that the new hard disk controller is causing a conflict in the C000/D000 areas
of memory, causing the VGAWonder to use 8-bit ROM access, rather than 16.  If
you are using video RAM shadowing, then this is not the problem; if you are
not, then try using video RAM shadowing.  This will copy the ROM into RAM and
will ensure it is being accessed 16 bits at a time.
Sanjay Aiyagari (hd7x@vax5.cit.cornell.edu)