MSDOS Source code leaked
ard at p850ug1.demon.co.uk
Thu Oct 12 18:36:19 CDT 2006
> As a curious aside, the trimmer near the 14 MHz crystal on the 5150 is
> intended not to adjust the time-of-day clock accuracy, but rather to adjust
> color rendition with the CGA card.
But only if you're using a composite NTSC monitor (the colour subcarrier
-- 3.58-ish MHz -- is 1/4 of the master clock freqwuncy, of course). On
a TTL RGB monitor, like the 5153, the trimemr does nothing.
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