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Article #129

Adress of memory beyond 1M on PC

#129
From: Tim Channon
Date: Thu, 23 Jul 1992 00:43
24 lines
1518 bytes
> >    We have a TANG IBM/PC 386 which has 4M of memory. Normally the adress
> >of memory in the PC consists of a segment plus an offset, say, ****:****.
> >1M is the limitation. My question is how can I access the memory beyond 1M?
> >In other words, is there an adress of the memory beyond 1M in the PC?
> 
As a slight side issue -- and this is rumour, no doubt unreliable but 
interesting just the same.

I have heard reported some strange findings when the MicroSoft SmartDrv disk 
cache program is loaded, the version that is supplied with Window 3.1

It appears that this program  does  things  to  the  processor  configuration 
registers  so  that  _all_  the  processor  memory  is  accessible via the ES 
segment. 
It was found that segment wrapping did not occur.

---- 
MicroSoft can supply the XMS specification and demonstration programs on disk 
to  do  with  various  standard  memory  accessing  schemes. The disk here is 
labelled 'XMS Specification and Drivers, Version 2.0'

  TC. 
    E-mail: tchannon@black.demon.co.uk or tchannon@cix.compulink.co.uk
                                
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Message-ID: <711852180snx@black.demon.co.uk>
Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!demon!black!tchannon
References: <1992Jul22.163525.3983@mpifr-bonn.mpg.de>

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From: tchannon@black.demon.co.uk (Tim Channon)
Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!demon!black!tchannon
Subject: Adress of memory beyond 1M on PC 
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References: <1992Jul22.163525.3983@mpifr-bonn.mpg.de>
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Date: Thu, 23 Jul 1992 00:43:00 +0000
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