Newsgroups: comp.sys.ibm.pc.hardware
Path: utzoo!utgpu!cunews!bnrgate!bigsur!bcars53!mussar
From: mussar@bcars53.uucp (G. Mussar)
Subject: Re: Computer slow since installation of SCSI drive
Message-ID: <1990Dec10.213919.26659@bigsur.uucp>
Sender: news@bigsur.uucp
Organization: Bell-Northern Research, Ottawa, Canada
References: <1990Dec9.050509.1470@vax5.cit.cornell.edu> <1990Dec9.195558.16216@bigsur.uucp> <4477@altos86.Altos.COM>
Date: Mon, 10 Dec 90 21:39:19 GMT

In article <4477@altos86.Altos.COM> rcollins@altos86.UUCP (Robert Collins) writes:
>In article <1990Dec9.195558.16216@bigsur.uucp> mussar@bcars53.uucp (G. Mussar) writes:
>>You can't shadow the video RAM only the video ROM. (What good would it do for
>
>Wrong!
>
>There are numerouse chipsets that allow you to shadow video RAM (A0000-BFFFF).
>
Gee, what a neat trick. The video card must be a bus master and be able to fetch
its data every refresh from the shadow RAM...

The fact that the address space can be shadowed doesn't mean that the system
will actually do what you want. Perhaps you can tell me why it works for your
video system but not for the people who have tried it on ethernet cards, token 
ring cards, cards with memory for the disk controller... I guess we just aren't
smart enough to find the trick.

--
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Gary Mussar  |Bitnet:  mussar@bnr.ca                  |  Phone: (613) 763-4937
BNR Ltd.     |  UUCP:  ..uunet!bnrgate!bcars53!mussar |  FAX:   (613) 763-2626