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Backwards Compatibility
When new technological products are designed, the manufacturers need to decide on how the product will work with its preceding models. This is called backwards compatibility. With the PS2, Sony assured its customers that old games from the PS1 would work on the new system. With the PS3, Sony began by trying to ensure backwards compatibility. The first PS3 system, which was released in November 2006, supported PS2 games. Two subsequent models were backwards compatible too, but the other 11 models are not as of publication in September, 2011.
Compatible Systems
The three backwards compatible PS3 systems have model numbers CECHB01, CECHA01 and CECHE01. The A01 and B01 models were the first two PS3 systems that Sony released in 2006, and the E01 system followed -- with a hard drive upgrade -- in August 2007. None of the subsequent systems are backwards compatible.
Identifying Models
Outwardly, most PS3 systems look the same. The first few models were notably larger than the models released after August 2008. The similarities make it difficult to know which model you have just by looking. To find find your PS3 model number, unplug all cords from the back of the system and turn it around. The model number is the last few digits of the serial number, which is printed on a black sticker in white lettering.
Compatibility Notice
Sony notes that most of its PS3 systems have "limited backwards compatibility." Before you buy a PS3, check the box for compatibility information. The notice specifically states that PS2 software "will not play" but that some PlayStation (PS1) software might. You can search for compatible titles at us.playstation.com.