Because its old or you broke it somehow.
Or what happened is one of the prongs in the input for the controller is missing. That happens a lot.
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No it does not work for PS2
Charge it, then try, if that doesnt work, restart the PS2. Make sure that any other remotes are not set to primary, if that doesnt work get a new one.
yes, the ps1 controllers are dualshock, and the ps2 are dualshock2, so it may not be as good overall as a ps2 controller, but it should work
no it will not
Of course you could, the jack on both Sony PS1 and Sony PS2 are exactly the same, although it lowers the performance than if you were playing with a Sony PS2 controller which means that you can not actually use the controller because who wants a controller that does not work completely. Used PS2 controllers are cheap and there are no good reasons to try and use a PS1 controller on your PS2 because it will not preform like a PS2 controller