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The 20gb and 60gb can play most ps2 games. The 80gb backward compatibility isn't as good as the 20gb and 60gb, but it still can play some ps2 games. The 40gb version can't play any ps2 games at all. It doesn't have backward compatibility.
Naw, look high and low and see if you can still find a 60GB or 20GB PS3. Those ones have the emotion chip in them and can play every PS2 game out there because it basically has a PS2 built with it in. It's going to be hard to find them but call your local electronic stores + ebay