Re: Memory expansion and AMI BIOS

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#20219

From: Peter Herweijer
Date: Tue, 26 Jan 1993 11:29

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In <1993Jan23.161519.1395@ultb.isc.rit.edu> ajb8886@ritvax.isc.rit.edu writes:

>In article <C15oxs.yp@sci.kun.nl>, pieterh@sci.kun.nl (Peter Herweijer) writes:
>>In <1993Jan20.002151.755@newshost.lanl.gov> masten@beta.lanl.gov (David A. Masten) writes:
>>
>>[...]  I assume that the chipset disables the RAM in the area that
>>is needed for interface cards (the top 384k), without being able to
>>move it to another place in the memory map.  It is partly used for
>>shadowing, though.
>
>It IS used for shadowing.  If you disable all ROM BIOS shadow features you'll
>find you can get the 384K back.  But then you also get slower VGA and system
>BIOS calls to ROM insteads of fast shadowed RAM.

Forget it. Don't you think I tried? The 384k is unreachable except for
shadowing. I am fairly certain that this is dependent on the chipset.
Some chipsets are able to move this RAM, some are not. It definitely
cannot stay where it is, because in prehistory IBM decided to use the
entire top 384K of the first 1Meg for I/F & ROM.

Peter Herweijer
pieterh@sci.kun.nl

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<1993Jan18.155720.131133@mswe.dnet.ms.philips.nl> <1993Jan20.002151.755@newshost.lanl.gov>,<C15oxs.yp@sci.kun.nl> <1993Jan23.161519.1395@ultb.isc.rit.edu>

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From: pieterh@sci.kun.nl (Peter Herweijer)
Subject: Re: Memory expansion and AMI BIOS
Message-ID: <C1GL9L.7yx@sci.kun.nl>
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References: <1993Jan18.155720.131133@mswe.dnet.ms.philips.nl> <1993Jan20.002151.755@newshost.lanl.gov>,<C15oxs.yp@sci.kun.nl> <1993Jan23.161519.1395@ultb.isc.rit.edu>
Date: Tue, 26 Jan 1993 11:29:44 GMT
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