My information could be out of date, but in the past, the realtime clock only
set Windows on bootup. During run windows kept time off the bus crystal (hence
the sensitivity to interupts)
No matter how cheap, only a defective real time clock will err anything close
to 1 minute/day, normal values are around 1 sec.
Jay
I could be talking a lot of hot air, so please forgive me, but I've
had a thought: if PCs still use a Real Time Clock chip, could a hardware
modification be done to give them an accurate clock frequency, rather
than relying on whatever cheap crystal is installed on the mother board?
Maybe one of the aforementioned TAPR Clock-Blocks configured for, I
guess, a 32768 Hz output?
I am worried by Hals comment though, that NMIs could upset the clock
- that suggests the PC clock is not just a simple RTC, which would render
the above suggestion invalid. Oh well, just a thought thrown into the
arena.
Peter
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