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Old 16 February 2013, 13:40   #64
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Join Date: May 2001
Location: New York
Posts: 19,265
Copper banding usually goes all over the screen area into overscan, this is why you see it exceeding the regular play screen. It's like on the C64, the "border" is a special area you access differently.

My guess is, and knowing not much about coding, is that the way copper banding works (or, at least, the way is implemented here), it affects all the screen memory on that bitplane, filling even onto the overscan with color data.
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