I've heard different stories regarding MultiTap usage on the PS2.

Some stores I go to say that in terms of backward compatibility MultiTaps work just like the memory cards i.e. you have to use a PS2 multitap for PS2 games and PSOne MultiTaps for PSX games.

Other stores I've been to say that the PS2 Tap will work with both PS2 and PSX games, but the PSOne Tap will only work with PSX games.

Yet another variation I've heard is that both PSOne and PS2 MultiTaps work with both PS2 and PSX games, with the only difference being that DualShock will not be available if you're using the PSOne Tap.

Does anyone know for SURE which version is correct? *I'm on the verge of buying a PS2 MultiTap but I want to make sure that it'll work for PSX games since I don't have any PS2 games that use a MultiTap. *I only want to buy a PS2 one because I'm looking towards future games.