I remember the introduction of the PS2. I was the first kid on my floor to bring one back after thanksgiving break (even beating out "The Cool Kids"). Of course, My confusion began when I tried playing my PS1 games. Sure, they worked fine, but the games wouldn't even recognize my fancy new 8mb PS2 card. So I held onto the old PS1 cards; sure, you could copy the saves onto the PS2 cards, but you'd have to load them back onto the older cards if you wanted to actually, y'know, use them. I think I actually bought more PS1 cards after I got my PS2.

And then of course was the N64 Memory card. If developers had embraced it faster (for game saves rather than just toting around high scores), it would have served just as well as the PS1 cards in their function.

Of course, then one wouldn't be able to plug in the rumble pack...