updated NOS code on thumper

[val!ben@cs.utexas.edu (Ben Thornton)]

> It turns out that you can convert the PC/AT's raw 8254 clocks (generated by
> a 3.579545... MHz NTSC color burst crystal divided by 3) exactly into
> milliseconds by multiplying by 11 and dividing by 13,125.
> ...
> Phil

Well...  almost correct.  Actually the crystal is a 14.31818 MHz crystal
(4x color subcarrier).  This is divided by 12 to 1.19318 MHz, which works
out to the same frequency as the one you are working with.

Ben

--
Ben Thornton             packet:  WD5HLS @ KB5PM
Video Associates       Internet:  ben@val.com
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Did Schrodinger exist? ...or was that in another universe?