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@Daft_Freak Fortunately there’s a whole bunch of RAM sitting there on the board! Unfortunately it has a tendency to disappear once a frame. If you only need ROM though it can be used…
@mike It's almost all RAM so I'm going to need to do some sneaky paging... 
@Daft_Freak Cache all writes and then reapply them to the other PSRAM on the frame swap? You might have to just block until vsync if too much RAM is written, but hopefully that is fairly rare 