From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Pointer to 0xA000
Date:	Mon, 08 Dec 1997 21:55:06 +0000
Organization:	Two pounds of chaos and a pinch of salt
Lines:	24
Message-ID:	<348C6CBA.4C83@cs.com>
References:	<01bd0337$01ac5e00$390760c3 AT benjamir>
Reply-To:	fighteer AT cs DOT com
NNTP-Posting-Host:	ppp211.cs.com
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Olmeca wrote:
> 
> I wanna have a pointer to the address 0xA000, but in Djgpp it's a problem.
> e.g.: unsigned char *vga=0xA000 (this doesn't work, cause of protected
> mode)
> in the FAQ's is something about the macro: _dos_ds, but I don't know how to
> use it...
> Anybody help?

Try chapter 10 of the FAQ.  This should point you to some items in
chapter 18, which show the available methods for accessing conventional
memory under protected mode.  There are several graphic libraries for
DJGPP such as GRX 2.2 and Allegro 2.2 that handle this for you.  There
is also an excellent beginner's graphics tutorial on Brennan's
DJGPP2+Games Resources at <http://www.rt66.com/~brennan/djgpp/>.

hth
-- 
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|      John M. Aldrich       | "Always listen to experts.  They'll  |
|       aka Fighteer I       | tell you what can't be done, and why.|
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