ecm support

[nurpax]

this would align with dirart ”masking” as ecm only supports 64 chars so the used chars should be constrained somehow on the ui. it should also support reordering chars from the rom font so users can choose a 64 char subset for their art.

[matozoid]

http://petscii.krissz.hu/ has a simple but useful implementation of ECM.

[nurpax]

@matozoid thanks for the tip! That looks good.

I was thinking of adding (maybe later if not in the first version) a wayvto sort the charset so that you could choose your own 64 char subset. This would of course require setting the charset on the C64 but it wouldn’t be too hard to do in the standalone .asm export.