=== Fourth Generation ===The Sega Mega Drive control pad has an eight-direction d-pad (referred to by Sega as the "D Button", short for directional button), a start button and three action buttons.
=== Sega Genesis/Mega Drive ===Уже в Mega Drive/Genesis контроллер обладал восьминаправленным D-pad, кнопкой Старт и тремя кнопками действия.