Problems with 'new?' Playstation


I've got a playstation type 7502 with a lot of games. Now my brother has the new version 9000 (something). Games that work fine on my machine don't work on his. Help me out please. (of course they both have a chip installed).


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i got 9000 had no probs with mine its prob way modchip was put in the only thing im moaning about is the missing paralell port off the back other than that no probs