Quote:
Originally Posted by compurandom
The technology to make small stand alone digital clocks that are accurate within a second per year has existed for at least 30 years. Why we have PCs that require network time synchronization to prevent their clock from drifting by minutes per day mystifies me.
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I would have said that maybe it's interrupts from devices but on the Unix systems that I worked on the clock interrupts ran at the highest interrupt priority. Maybe the clock interrupt routine sometimes takes longer than an interrupt cycle; on the original Unix systems it was 60 times a second (which may seem like a lot of time but remember that cpus were much slower back then).
But then again, that
was 30 and more years ago.
I could bend your ears with stories of reel to reel tape drives and disk drives the size of a washing machine and whatnot.