>> 55ms (or 55.55555ms to be more exact)  is about 18 pulses per 
>> second.

> ... 4.772727 MHz.

which was chosen because that's the NTSc color burst frequency and the 
crystals are cheap.

> If you want 55.55555 ms, that's *exactly* 18 pulses/second.

In engineering at least, 'about' includes 'exactly' :-)



                RM

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