Date: Fri, 16 Feb 2001 08:16:58 +0200
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: "Rob Kramer" <robk AT cyberway DOT com DOT sg>
Message-Id: <7458-Fri16Feb2001081657+0200-eliz@is.elta.co.il>
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CC: djgpp AT delorie DOT com
In-reply-to: <3a8ca532$1@news.starhub.net.sg> (robk@cyberway.com.sg)
Subject: Re: System clock problem.
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> From: "Rob Kramer" <robk AT cyberway DOT com DOT sg>
> Newsgroups: comp.os.msdos.djgpp
> Date: Fri, 16 Feb 2001 11:48:33 +0800
> 
> My application shows a clock on a graphics screen, amongst other things.
> Recently I've had a problem that on some devices (after 2.5 years of perfect
> operation) the clock starts speeding up mysteriously.

What do you mean by ``devices''?  Does that mean this happens on some
PCs but not on others?

> My program gets the time from the time() call, which ultimately gets it from
> Int. 0x21 function 0x2a/0x2c as far as I can see in the DJGPP sources.

This is true.

> Anybody has a clue what might cause the clock to speed up? The weird thing
> is that if I go back to DOS, the system time is perfectly OK.

``Go back'' here means that you just exit the program?  You don't
reboot, do you?

> Doesn't the DOS time command use int 21 as well?

Yes, it does.

> There's only one RTC, right.. If I
> start my application again, it's fine (but only for a few hours/days).

Try to use `gettimeofday' and compare its output to what `time'
produces.  Perhaps it will tell you something.