I'm digressing because it's not a WinUAE option
But I think it should be quite easy to add a rainbow background when modifying the copper list of a game like Great Giana because the scrolling is horizontal.
besides, maybe I'll try with an update of the slave whdload...
it's a little more complicated with a game like Turrican because the scolling is multi-directional.
But not impossible if you have enough free CHIP memory and you locate in memory the data relating to the Y position of the scrolling.
Last edited by CFou!; 22 September 2022 at 10:00.
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