I'm sure it is around 99%. However it affects some of my favorites: Final Fantasy Anthology, Suikoden 2, Fight Maker, the Midway Arcade collections. I hope they all continue to. But if they have to sacrifice for the new concole, I don't want it. I think backwards compatability is not important to most of the people who play video games. When Sony said the PS3 may not be backwards compatable, not many where complaining.