i already use two of this adapter on my A1200, and i'm very happy with it.
But this week i plugged one in my A500+ .. and surprise... one of 2 resistors near the joy connector started to burn with a white smoke...
re-plug my Speedking Joystick, no prob all is working...
re-test : psx-adapter.. re white smoke... STOP.. and i don't know why i can't use it in my A500+