Yes, to store PlayStation 2 game data you need a 8MB (PS2) memory card.
The PS2 will still play most games without a memory card
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You can get a cheap PlayStation 2 memory card online from Amazon for roughly $13. You can also purchase used PlayStation 2 memory cards from used game stores such as GameStop.
I do believe that a PlayStation 2 will recognize a PlayStation 1 memory card. I use a ps1 memory card in my ps2 might it might vary from the different memory card brands.
The PlayStation 3 has a built in Hard Drive. Ps3 game saves will be saved to the Hard Drive. But to save PlayStation 1 + 2 games, an internal mermory card must be created inside the Hard Drive. PS1 + PS2 games will save there. So no you don't need a memory card for the PlayStation 3.
yes, as long as its a playstation 1 memory card you are saving to.
No, the ps3 does not have memory card slots.