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Old 22 December 2014, 21:31   #13
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Join Date: Aug 2004
Posts: 2,828
After writing a little test program that loops writing to COLOR00...

On alternate frames, the last line is either correct (changing colour from left to write as the test program runs), or on frames where it should be all black, it's the same as colour 0 at the right edge of the previous (last real) scanline. So effectively it latches the colour 0 value from the last real scanline.
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