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Old 31 December 2012, 18:37   #21
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Join Date: Aug 2004
Posts: 2,831
Also it says the HSYNC reset pulse is 32usec long (which is about half a scanline period), though it looks shorter than that in the timing diagram. It looks to end about 1/3 of the way through the scanline in the diagram. CIA-B TOD counts on the rising edge of that so it will count at 1/3 to 1/2 the way along every other scanline.
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