Something I made last summer that my friends thought was pretty cool. I ordered some USB converter kits from retrousb.com the kits get soldered into the controller and you turn your old legit controller into a USB controller.
Well I like to go overboard and went a step further, I added a USB hub and flash drive and wired it all together inside the controller so I could have my ROMs and saves right on the controller
I want a USB SNES controller so bad! I think it's time for me to get my ass in gear and make one. Xbox 360 controller is terrible for Killer instinct :(
Love it! Reminds me of a senior project a few people did in college they took an NES controller, added a flash drive and a microcontroller to play all games on a monitor/tv all within the small footprint of the NES controller( might have been a little thicker than normal but it was cool).
I have thought about doing an N64 controller, there is a lot of free space inside the grips of the controller.
I would have liked to make something that I could hook directly to a display and play the games but that is far over my head.
I've made a few of these, I sold 2 NES controllers on Craig’s list, sold an SNES controller to a coworker, my sister gave a SNES controller to her boyfriend last Christmas, after I showed it to him he told my sister that he wanted one for Christmas, and the Sega controller went to a friend as a birthday present.
I still have a NES and a SNES controller for myself, I have seen another variation of this mod where the person used a USB keyboard PCB instead of a console to USB adapter, I like mine better though because it will come up as a USB controller in the PC
You can order one from him, all though it's a bit expensive, or if you know how to solder you can buy the DIY kit. Works on just about every classic controller apparantly, haven't tried it out myself though.