From:	Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Physical Address Mapping under XP
Date:	7 Aug 2003 09:07:10 GMT
Organization:	Aachen University of Technology (RWTH)
Lines:	17
Message-ID:	<bgt4ru$enn$1@nets3.rz.RWTH-Aachen.DE>
References:	<3f317a87$1 AT news DOT 012 DOT net DOT il>
NNTP-Posting-Host:	acp3bf.physik.rwth-aachen.de
X-Trace:	nets3.rz.RWTH-Aachen.DE 1060247230 15095 137.226.32.75 (7 Aug 2003 09:07:10 GMT)
X-Complaints-To:	abuse AT rwth-aachen DOT de
NNTP-Posting-Date:	7 Aug 2003 09:07:10 GMT
Originator:	broeker@
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Avi Berkovich <berkovis AT 012 DOT net DOT il> wrote:
> Hello,
>   After running my old Vesa VBE2 code on XP, I realized that the DPMI
> function for mapping a physical address for the LFB doesn't work under XP.

In Windows XP support for any kind of direct, and sometimes even for
_indirect_, hardware access by DOS programs is somewhere between
miserable and non-existant.

In particular, you can mostly forget about any VBE support whatsoever.
The only thing you can get to work somewhat reliably are the original
VGA/MCGA modes from 13 years ago, i.e. 640x480 AT 16 and 320x200 AT 256

In other words: for this kind of program, you better stay away from XP.
-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.

- Raw text -