I was pondering recently how hilarious it would be to, say, take an old 486 CPU and build a special cartridge with it, a long cartridge with it, and a huge heatsink sticking out of it, heh. The NES is so expandable, anything is possible. The fact is, one could really do EVERYTHING in x86 code if this cart was made. It would just need to catch the vectors. Imagine running a cart with a fast 486 processor to handle all the code! Think of what you could do in HBLANK!