Re: System Clock update rate of 0.055 milliseconds in DOS/Win95 and Ada.Calendar

[Paul Whittington <paul@grep.net>]

There are at least two possibilities.  One is Win32 specific and the
other Intel specific.

1) Win32 API call.  The GetTickCount function retrieves the number of 
milliseconds that have elapsed since Windows was started.

2) Use the RDTSC instruction on the Intel Pentium processor to
read the timestamp counter.

Both of these are not platform portable.  The first is accurate to one
millisecond while the second is accurate to one processor cycle.

TTFN Paul

Craig Garrett wrote:
> 
> In Dos/Win95, the system clock is only updated every 0.055 milliseconds,
> which from a real-time simulation perspective is absolutely pitiful.  Is
> there a system call to force the OS to update the system clock more
> frequently or on demand?  I am sick of having such low resolution.  How do
> real-time games such as Quake and flight-sims on PCs running Dos/Win95 get
> around this problem?
>   Craig

-- 
Paul Whittington
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paul@grep.net

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