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http://www.nintendoworldreport.com/video/38870/nintendos-gamepads-episode-2
If you missed the first episode you can check it out here
In episode 2 of Nintendo's Gamepads we meet an inventor name Gunpei Yokoi. Yokoi invented what might very well be the most important thing in the history of controllers, the D-Pad. As Nintendo moved from the third generation with the NES through to the fourth and fifth generations they'd have to get creative with their controllers.
Learn all about the design philosophies behind the NES, SNES, and N64 controllers in this video!