Atari, Commodore, MSX, SEGA 

You switch a, b, c, d, depending on what type of console you are playing on.

You can play both  player 1 and player 2 on the same controller.

Great for Atari, 

Features suction cups on the bottom.

Note: only has 2 buttons, Might not be suitable for some Sega games where you require the native 3 button configuration