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ross · 29 January 2020, 13:27

Your bitplane screen buffer seems for a 512x256 screen ($49FC-$09fc=$4000->/256=64->*8=512).

As your registers setup is for a 320 screen, you need to set modulo registers to
512/8-320/8=64-40=$18

29 January 2020, 13:27	#3
ross Defendit numerus Join Date: Mar 2017 Location: Crossing the Rubicon Age: 53 Posts: 4,479	Your bitplane screen buffer seems for a 512x256 screen ($49FC-$09fc=$4000->/256=64->*8=512). As your registers setup is for a 320 screen, you need to set modulo registers to 512/8-320/8=64-40=$18