From: "deckerben" <deckerben AT freenet DOT de>
Newsgroups: comp.os.msdos.djgpp
References: <8ed56b42 DOT 0210250706 DOT 4d2222c6 AT posting DOT google DOT com>
Subject: Re: Trying to use VESA under Windows XP
Date: Sat, 26 Oct 2002 00:53:23 +0200
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"R. Charles Henry" <trapforcannedmeatproduct AT hotmail DOT com> wrote in message
news:8ed56b42 DOT 0210250706 DOT 4d2222c6 AT posting DOT google DOT com...
> Having a bit of trouble trying to use VESA under Windows XP.
>
<snip>
>
> On XP, however, the display becomes garbled, the pixel fields
> split into several bands at 640 x 480, higher modes do nothing.
> (Monitor flashes up an 'invalid signal' warning at 1024 x 768).
>
> Does anyone have any tips? I don't have a lot of experience with
> C or DJGPP and am a little puzzled.


Hi.

The problem seems to be NT-related. We have been having the same BIG trouble
with the MESA DJGPP port running on NT-based OS like mine (Windows 2000) and
probably XP. The problem is that NT does not allow direct access to PCI
addresses ... the brilliant logic behind that big fumble at Micro$oft being
that the OS should manage hardware and programs shouldn't be allowed to
manipulate it on their own.

You might have success with VDMSound ... it allows some DOS-based hardware
access on NT systems.

Ben