with the ps1 there was the action replay which relied on the connection port in the back of the machine, it also used a spring to keep the button that detects the cd hatch closed so you could boot a regular ps1 game and then swap it. The playstation 2 is quite different, the internals are reminiscent of a dvd player and are much more advanced in comparison to the original ps1, they developed a chip that could be attached how ever and like i said you are supposed to be able to hook it up to a computer and gain access to the operational programming.