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Living Room / Re: Windows XP system clock losing (lots) of time.
« Last post by 4wd on December 25, 2011, 06:50 PM »Hm, would a CMOS battery affect the RTC of a running system? I WouldaThunk it only used the battery when powered off?-f0dder (December 25, 2011, 09:04 AM)
That's what I said in my previous posts, RTC time has no effect on Windows OS once it's up and running, (unless you're telling Windows to get it from the RTC, of course, like I am with ClockMon).
Windows uses interrupts once it's running but for the sake of completeness I changed it yet again, even though I'd already proved it was OK.
Currently the system is behaving itself so AFAIAC it comes down to one of two things:
1) Software that I installed post-October, or
2) The PWM fan controller generating sufficient interference to upset the clocking.
I have had the second happen once before but on the 240V mains system, a slave/master switch inducing enough interference into the mains circuit to cause a new digital clock on the other side of the house to run fast....returned the clock twice before I worked out what it was


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At some point I must have disabled or forgotten to enable the HPET and WDRT in BIOS when playing with the battery.

