You also forgot this one. Or maybe were just never aware of it.
https://upload.wikimedia.org/wikipedia/commons/thumb/6/66/Sega-Genesis-6But-Cont.jpg/800px-Sega-Genesis-6But-Cont.jpg
Not that I actually thought of it before SNES/playstation. I did think of it before Gamecube, though, despite playing a ton of Melee. I always used Y to jump in that.
http://24.media.tumblr.com/tumblr_lxkdr0uNc91qlu5jao1_r1_400.gif