GCC on a 486: Addressing physical memory?

Article View: gnu.gcc.help

Article #51353

#51353

From: Julian Field
Date: Tue, 25 May 1993 12:16

17 lines
1414 bytes

We are using GCC on a '486 PC.
We can access physical PC memory below 1MB easily.

How do we access a physical PC address above 1Mb ?

This is because we have a video grabber whose video ram is mapped onto
13Mb in the PC address space.

Many thanks in advance,

Jules and Steve.

-- 
Julian Field, MEng.                                 jkf@soton.ac.uk
Department of Electronics           ___   __o       Fax: +44 (703) 592082
University of Southampton          ___    -\<,      Tel: 0703 593021/592774
Southampton SO9 5NH, UK              .....O/ O      Disclaimers? Who needs 'em!

Technical Details

Message-ID: <1tt2nk$adr@gauguin.ecs.soton.ac.uk>

Path:

arc1-ca.pugleaf.net!gmd.de!Germany.EU.net!mcsun!uknet!doc.ic.ac.uk!bright.ecs.soton.ac.uk!gauguin.ecs.soton.ac.uk!not-for-mail

Show Full Headers

Complete Article Headers

X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 11318c,a3b78e9c3596667a,start
X-Google-Attributes: gid11318c,public
X-Google-Thread: 10f6aa,a3b78e9c3596667a,start
X-Google-Attributes: gid10f6aa,public
X-Google-ArrivalTime: 1993-05-25 05:35:21 PST
Path: arc1-ca.pugleaf.net!gmd.de!Germany.EU.net!mcsun!uknet!doc.ic.ac.uk!bright.ecs.soton.ac.uk!gauguin.ecs.soton.ac.uk!not-for-mail
From: jkf87r@ecs.soton.ac.uk (Julian Field)
Newsgroups: gnu.gcc.help,comp.os.msdos.programmer
Subject: GCC on a 486: Addressing physical memory?
Date: 25 May 1993 13:16:52 +0100
Organization: Electronics and Computer Science, University of Southampton
Lines: 17
Message-ID: <1tt2nk$adr@gauguin.ecs.soton.ac.uk>
NNTP-Posting-Host: gauguin.ecs.soton.ac.uk
Summary: How do we do it ?
Keywords: Addressing physical memory above 1MB