From: "Ben Peddell" <lightspeed85 AT hotmail DOT com>
Newsgroups: comp.os.msdos.djgpp
References: <Pine DOT SUN DOT 3 DOT 91 DOT 1030210075002 DOT 7932C AT is> <b29tp3$1agvkq$1 AT ID-79865 DOT news DOT dfncis DOT de> <3e489301 DOT sandmann AT clio DOT rice DOT edu>
Subject: Re: how to make a Timer
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Date: Tue, 11 Feb 2003 18:34:49 +1000
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Why not make use of RDTSC? Just divide it by 84 for every 100MHz of CPU
speed. (i.e. for a 1GHz [100MHz x 10] processor, divide by 840; for a
processor with a 13.5x multiplier on a 143MHz FSB [1933MHz], divide by
1620.)

Charles Sandmann <sandmann AT clio DOT rice DOT edu> wrote in message
news:3e489301 DOT sandmann AT clio DOT rice DOT edu...
> > However problem with uclock resolution not solved.
>
> Ah, yes, I believe it's delay() that was fixed, not uclock.
>
> The problem with uclock is the bios tic rollover isn't aligned with the
> PIT counter under Win2K.  It happens at roughly the same point in the
> cycle - but not exactly - each time.
>
> Someplace I have code that works "better" - but still not perfect.
> I haven't decided if "better" is worth putting in since it's still
> broken - just less noticable (which might be worse...)
>