Look for the Original Playstation joypad.
The very first one that they made.
Look at the back of the controllers.
Look for a alphabet letters such as (H).
These letters represent when these control were made.
The earlier one doesn't have the BLACK STUFF on it, so you can solder on them.
You can fine these Original Playstation joypad at you local buy and sell used store. (Funcoland) or (GAMEZONE)
Look for letter (H) or any letters before (H).
