No, you can't use ps2 controllers to play ps3.
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No. The PlayStation 3 doesn't have the PlayStation 2's input sockets for the controllers. However, Sony were planning to release a USB adaptor for the PS3 so that you could use your old controllers. It was never released, and is never being released in the UK, but I'm not sure about other territories such as the US or Japan.
No, the PS2 needs a receiver programmed to the PS2 guitar, whereas the PS3 is fully controller wireless
The system supports up to 7 controllers that are connected via Bluetooth 2.0 technology.
Playstation controllers are made with SIXAXIS, a paticularly expensive technolgie but enhanses the sharpness and also lets the controllers last for 30 hours of gaming compared to the xbox's 8 hours of gaming
No as the PlayStation 3 Blu-Ray discs are too large to fit in the DVD slot on the PlayStation 2, although you can play most PlayStation 2 games on American PlayStation 3's and around 50% of PlayStation 2 games on European PlayStation 3's.