Wait, did sony come out with an official emulator, or is this just someone's homebrew or hack?
If you don't know, homebrew refers to user created games they are not official licensed by Sony (or whoever made the console). The thing about homebrews is that in most cases, you need to use some hacks to get them to load. Usually these hacks are the same ones you need to use to get pirated games to run.
As I understand it, console makers can't allow homebrews for two reasons, the need to prevent piracy, and the need to make all commercial games license from them (that's how they make their money after all).