I actually assumed that this was actually creating ROMs.<p>I wonder if you could somehow use a large multimodal model trained on all of the existing NES software machine code along with manuals, forums and videos for each game. If it's not enough training data, maybe include other 6502 software, with the platforms encoded to differentiate?<p>Then you get a model that can take a description of a game and maybe a proposed screenshot and generate a new ROM. You train it further by testing the ROMs and giving feedback, starting with negative feedback for ROMs that don't boot.