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Old 20 November 2019, 23:41   #5
a/b
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Join Date: Jun 2016
Location: europe
Posts: 174
Based on generator code, it looks like your split screen starts at line $dc.
And based on copper list dump, you are changing a bunch of bitplane stuff right at the very end of line $db leading into line $dc (bplcon0, modulos, bitplane pointers), all while display DMA is still enabled. I'd try setting $0100 (bplcon0) to $0200 first, then change stuff, and finally set $0100 to $3200.
Plus there's also a $008a trigger, so maybe check if you can squeeze all that stuff within horizontal blanking, otherwise you'll need an empty line.
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