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PostPosted: Mon Mar 12, 2018 3:43 pm 
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Joined: Wed Sep 21, 2016 12:08 pm
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UPDATE:

Well that worked. I removed the PPUMASK write that was at the end of the initialization code and put it at the end of the update code. In both positions it immediately followed a BIT wait, so I am not sure why the difference in position caused the problem. Now the left image is blank which works for me. I'd like to know why I was getting this error because I must not be understating something subtle about the timing and ordering of NMI, bulk writes to the PPU, and the enable/disable rendering.


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