I was wondering if anyone had tried outputting the sprites on a seperate 8-bit port (there appears to be some pins free on the schematic and maybe you could move some things around to free up an entire port?) so you're background and sprites bot appear on different output ports and are mixed in hardware, some sort of check to determine which port is used and then pass that onto the ladder... saves a couple cycles trying to do the logic in software :-p.
Might be a crazy idea but I thought I'd mention it to see what others think .
Chris
Sprite and background output on different pins...
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