15 Mar
2008
15 Mar
'08
2:10 p.m.
dwight elvey <dkelvey at hotmail.com> writes:
No, that's 3.579545 MHz (or 4.43361875 MHz for PAL) -- this one's a
bit faster than the NTSC colourburst, which presumably is what makes
it unusual...
To be pedantic there are several PALs (including at least one 525 line
one), and I asusme several NTSC-like standards, all of which have
slightly different colourbust frequencies. I don't konw of any that's
3.59... MHz, though.
3.595295
MHz
TV color crystal frequncy.
Colourburst crystals do show up in quite a few computing devices,
though. I built a couple of Z84C00 machines running at the PAL
colourburst rate in the mid-1990s.
The Science of Cambridge MK14 clocked the SC/MP at 4.43... MHz,
presumably because that was the cheapest crystal around. And 3.57... MHz
xtals turn up all over the place, including in things which have nothing
at all to do with video
-tony