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I just went googling, and found a model that used an odd horizontal frequency (15816) , I guess either in order to get particular pulse widths or to accommodate a simple counter circuit to lock things. So I guess there were variations on the basic idea, but all had to work by slipping color by one cycle per horizontal, whatever the horizontal was that they used. 15750 (the monochrome horizontal rate), locked to a 189 kHz pulse rate, is another likely choice.
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