Re: Memory expansion and AMI BIOS

Article View: comp.sys.ibm.pc.hardware

Article #19573

Back to comp.sys.ibm.pc.hardware Previous Next

#19573

From: ajb8886
Date: Sat, 23 Jan 1993 16:15

29 lines
1774 bytes

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

Technical Details

Message-ID: <1993Jan23.161519.1395@ultb.isc.rit.edu>

Path:

arc1-ca.pugleaf.net!sparky!uunet!gatech!destroyer!cs.ubc.ca!uw-beaver!cornell!rochester!rit!isc-newsserver!ritvax.isc.rit.edu!AJB8886

References: <1993Jan18.155720.131133@mswe.dnet.ms.philips.nl> <1993Jan20.002151.755@newshost.lanl.gov>,<C15oxs.yp@sci.kun.nl>

Show Full Headers

Complete Article Headers

Newsgroups: comp.sys.ibm.pc.hardware
Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!destroyer!cs.ubc.ca!uw-beaver!cornell!rochester!rit!isc-newsserver!ritvax.isc.rit.edu!AJB8886
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
Reply-To: ajb8886@ritvax.isc.rit.edu
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

Reply to Parent Message