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From: smsmith@hpuxa.acs.ohio-state.edu (Stephen M. Smith)
Subject: Re: hard 80386 questions
Message-ID: <1991Mar30.211923.29185@magnus.acs.ohio-state.edu>
Keywords: 80386 (80286)
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Date: Sat, 30 Mar 1991 21:19:23 GMT
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I made a mistake in my previous posting:

(this concerns Micronics ASIC 386 motherboards)

>First of all, when switch 4 is enabled, the system BIOS is shadowed
>to F000-FFFF and the video BIOS is shadowed to C000-C800.  This
>is the way most clones do it.  BUT, the motherboard manual when
>talking about BIOS shadowing refers to 128k of ROM that is used
>in the shadowing process.  THIS IS WRONG.  Only 64k gets shadowed.
>This is important, because if you use an EMM like QEMM which puts
>the 64k page frame at D000-DFFF, SETSYS will show "PAGE FRAME"
                       ^^^^^^^^^
I meant to say E000-EFFF.

>in its setup screen under SHADOW BIOS instead of saying "ENABLED",
>and it will give a warning message saying something like "page
>frame address cannot be in D000 segment; check your EMM manual
                            ^^^^
I meant to say E000.

>to switch the address of the page frame."
>
>The solution is to move the page frame to C800-CFFF.  This makes...
                                           ^^^^^^^^^
I meant to say C800-D7FF.  Obviously, you need the full 64k for
a page frame, and C800-CFFF is only 32k.  I use C800-D7FF for my
page frame instead of D000-DFFF because it makes D800-EFFF
to be a 96k area of contiguous high ram available to QEMM for
other things.  Desqview, for example, can load itself into this
area with no (apparent) conflicts with SETSYS.

>...SETSYS happy, and you can then turn cache on and off, set the system
>speed up or down, and turn the BIOS shadowing on and off with SETSYS
>without any problems.

Sorry for these mistakes!

SS