I've never heard of one. Apart from the fact that the older consoles become rare and expensive, one of the reasons emulators are made for the older consoles is that making emulators requires the PC to run a virtual PC inside itself which drives the game. This is a really taxing process on the CPU, so you would probably need a really really powerful rig to be able to emulate something like an Xbox 360. There's also something to do with the software which runs the games being proprietary as well. I don't know much about this, but I that's what I think.