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   Author  Topic: Timekeeping  (Read 458 times)
POISN
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Posts: 48
Timekeeping
« on: Jan 18th, 2003, 3:49am »
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My LZ no longer keeps accurate time. It's clock gets ahead by about 20 minutes per week. Anyone here ever experienced this problem with your organiser? Could this be a software problem or only a hardware problem?
Zac Schroff
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Posts: 81
Re: Timekeeping
« Reply #1 on: Mar 10th, 2003, 4:57pm »
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Once I wrote an OPL program which changed the free running counter / keyboard scan IRQ frequency and had to hard reset to get the behaviour back to normal (before I knew what the proper value was for this feature).
 
However, I thought the clock NMI was divided from the main crystal oscillator for the system.  If this is the case, you're dealing with a drifting crystal or some of the support for the crystal.  The schematics should be able to point you to the correct components to replace (I'd put a freq counter on the crystal output before trying anything though).  Feeling brave?  :-o

Tact is for those who are not witty enough to be sarcastic.
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