Clone games from other systems?

Hello. I always see some games from other systems such as arcade, playstation and such... I already know about roms and emulators but my question is.. Is there a way to take a ps1, ps2, ps3 or xbox game and clone it so it will burn onto dvd and work on the wii?

The Wii is too weak to handle PS2 ,PS3, or Xbox. As far as PS1, WiiSX can load images from DVD if your system can handle burned discs. But it won't be like a PlayStation in terms of loading...As in you can't just pop the disc in and have it load straight to the game.