From: "Michael Stewart" <mike AT reggin DOT freeserve DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Vsync!
Date: Thu, 29 Jul 1999 16:58:31 +0100
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Knutte wrote in message ...
>A few minutes after I wrote this I tried to force Allegro to use VESA 1.0
>instead of Autodetect. The Attempt was successful so the problem lies
within
>the communication between Allegro and my GFXcard.  Thank you all for the
>help


I'd be suprised if that was the case. Any problems with vsync would have
been sorted out a long time ago.

This is the `standard' method of waiting for the vertical retrace (I would
think Allegro will be similar if not the same). Try it and see if this
works.

void vsync () {
  while (inportb (0x3DA) & 8);
  while (! (inportb (0x3DA) & 8));
}