Control Pad (Master System)
From Sega Retro
Just a minor correction from a brazillian player: The 6-button controller of the Sega Master System wasn't necessary compatible with the Sega Mega Drive/Genesis. Not only it lacks the Start and Mode Buttons, only the black model with a red LED works on Sega Genesis (with the limitations of the lack of start, for sure).
The weird is there's a 6-button controller for Master System released by Tectoy which HAVE the Start button, but DOESN'T WORK on Mega Drive, neither the start button works on Master System I, II e III original hardware.