From:	"Matthew Conte" <spam AT somebody DOT else>
Newsgroups:	comp.os.msdos.djgpp
References:	<6vp6lh$g71$2 AT otis DOT netspace DOT net DOT au> <36209c73 DOT 0 AT d2o63 DOT telia DOT com>
Subject:	Re: vsync
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Date:	Mon, 12 Oct 1998 09:45:58 -0400
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Henrik Rydgård wrote in message <36209c73 DOT 0 AT d2o63 DOT telia DOT com>...
[...]
>framerate goes straight down to 30 FPS. And if your program can't cope with
>that, it will go down to 15. And the program will go four times as slow.
>Does anyone know how to maintain a constant speed?

Yes- you need to hook into the DOS Int 8h timer interrupt, and reprogram it
to fire off at say 60Hz or so.  Then you have it call a interrupt handler
which just increments a variable, and you can base your redraw function off
of the value of that tick counter.  It's really quite easy, just ask and I
will post some sample code.

Later,
Matt.

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