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- Newsgroups: comp.sys.ibm.pc.hardware
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- From: ajb8886@ritvax.isc.rit.edu
- Subject: Re: Memory expansion and AMI BIOS
- Message-ID: <1993Jan23.161519.1395@ultb.isc.rit.edu>
- Sender: news@ultb.isc.rit.edu (USENET News System)
- Nntp-Posting-Host: vaxa.isc.rit.edu
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- Organization: Rochester Institute of Technology
- References: <1993Jan18.155720.131133@mswe.dnet.ms.philips.nl> <1993Jan20.002151.755@newshost.lanl.gov>,<C15oxs.yp@sci.kun.nl>
- Date: Sat, 23 Jan 1993 16:15:19 GMT
- Lines: 29
-
- 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:
- >>[...]
- >>Since you ask, I have a similar problem. But mine says only 3712 Kb OK!
- >>And I had the same difference of 284 KB "missing" when I only had 2 MB
- > ^^^
- > 384
- >
- >>of memory. Since they were entirely different chips, I presume it is
- >>not a problem with the RAM itself. I have an AMI BIOS date 5/5/91.
- >
- >I have the same amount of RAM, the same brand of BIOS and the same
- >effect. 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.
-
- Alex
-
-
-
-
- >
- >Peter Herweijer
- >pieterh@sci.kun.nl
-