Someone asked on NESdev BBS about making DDR on NES using four controllers. It turns out the NES PPU can't pull it off. There would be too many sprites on a screen (limit is 64, sized 8x8 pixels each) and too many on a scanline (limit is 8).
My parents are still alive!
This file isn't really unused. It's linked from this post on NESdev BBS.
Categories: Files used on forums