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From: micha@ixos
Newsgroups: comp.unix.i386
Subject: Shadow RAM with UNIX
Keywords: Shadow-RAM, BIOS, Memory
Message-ID: <1239@ixos.UUCP>
Date: 17 Jul 90 07:50:05 GMT
Sender: micha@ixos.UUCP
Reply-To: micha@ixos ()
Organization: iXOS Software, Munich, West Germany
Lines: 29


John Wilkes wrote:

> 5. What is "shadow ram" and do I want it enabled?  As I said, I am new to
> i386 based systems, and I'm blissfully ignorant of the MS-DOS world.
> Anyone who wishes to contribute to my education will earn my undying
> gratitude.
>
> John Wilkes
>
> wilkes@mips.com   -OR-   {ames, decwrl, pyramid}!mips!wilkes


Shadow RAM is an hardware possibility to copy the slow ROM (e.g.
System-BIOS, VGA-BIOS) into fast RAM, deactivate the ROM and activate
the RAM write protected.

This is only useful for operating systems wich are using the BIOS
like MS-DOS. Under UNIX *all* BIOS is disabled. All activities are
made by device drivers. The amount of memory, normally 256 or 384K
is *lost*, so Shadow-RAM with UNIX is useless.

Micha


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