From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Help X memory peek & poke?
Date:	Fri, 16 Jan 1998 19:36:10 -0500
Organization:	Two pounds of chaos and a pinch of salt.
Lines:	31
Message-ID:	<34BFFCFA.8F7@cs.com>
References:	<01bd2288$fc7589e0$45374b82 AT PCM-2 DOT iw DOT uni-hannover DOT de>
NNTP-Posting-Host:	ppp247.cs.com
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Fadi Rifai wrote:
> 
> How can memory space above 1M (32 bit address space) be accessed with
> djgpp? An example how to peek & poke data would be very helpfull.

If you are referring to allocated memory used by your program, then you
don't need to use any special interface.  Simply call malloc( 32 * 1024
* 1024 ) and play with the results.  :-)  The DPMI interface built into
DJGPP transparently handles all aspects of memory management so that you
can write statements like the above without any overhead whatsoever.

If you want to access memory locations with fixed absolute addresses
outside your program's address space, then you must use the DJGPP
extensions designed for this purpose.  Probably the best functions to
use are the farpokeX()/farpeekX() functions, which you can look up in
the DJGPP library reference ("info libc").  The DJGPP Frequently Asked
Questions list contains a vast amount of information (too much to post
here) on the topic of memory access in chapter 18.

If you have a specific application in mind, please describe it in detail
and we'll try to give you more specific advice.

hth

-- 
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|      John M. Aldrich       | "A committee is a life form with six |
|       aka Fighteer I       | or more legs and no brain."          |
|   mailto:fighteer AT cs DOT com   |                                      |
| http://www.cs.com/fighteer |                 - Lazarus Long       |
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