Yes, you can use them to save PlayStation 1 games when you play them on the PlayStation 2.
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Can't play ps2 games or use ps2 memory cards.
No.
Yes, only for PSone games though. PS2 games require a 8MB (PS2) memory card.
No, PS2 memory cards are keyed differently, and will not physically fit inside the PS machine.
For a more detailed answer, the reason you cant is because tye ps2 memory cards dont even fit inside, they are too big. However, i think a ps1 memory card may work, as they work on gamecubes, and the wii uses gamecube memory cards