-> As a modulation scheme it promises impproved colour purity, in common use
-> it also uses more lines than ntsc to give slightly higher resolution. but
-> at a lower frame rate.

 The cheapest way to get the Frame rate is synch it to the Power Line.
Those with 50 Hertz power systems do have a different frame rate then
the 60 hertz countries as I recall. This is going WAY back into the
memory cells.
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