[The Germanator]

Was there any actual proof that Nintendo actually helped design the PS controller? I know that Sony and Nintendo were in talks with the whole CD add-on deal, but did it ever get to the point where they actually designed the controller? I never remember reading about that, but if you could provide a link to a story or cite something from a book that'd be cool. Not trying to be a jerk, but I've never personally heard anything about Nintendo having any input about the PS controller.