IMSAI/586 [ Re: Multiuser computing invented! ]

From: William Donzelli <>
Date: Thu Jan 21 09:24:26 1999

> I think it's dynamic processor like the 8080 so there is a minimum clock
> that is likley a few Mhz.

Many of the faster CPUs these days have PLLs up front, so the minimum
clock speed may be a a function of the PLLs locking window.

The 68332 had (has, as I think it is still being made) a very interesting
feature - if the crystal fails (stops oscillating), the PLL will still
keep going and generate an interupt telling you that your crystal has
died! Just do not trust what the timers on the chip say, as that PLL will
tend to drift...

William Donzelli
Received on Thu Jan 21 1999 - 09:24:26 GMT

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