Something kinda interesting for you guys to check out - I dismantled a Genesis controller, and did some Frankenstein voodoo magic to interface it's digital multiplexer with a NES dogbone controller. The results? An NES controller that works with the Sega Genesis, Master System, Atari 2600, and more!

Check it out.

http://www.youtube.com/watch?v=lFxgqwrFGXI