The NES Advantage is an arcade style controller sold for the Nintendo Entertainment System beginning in 1987. The device is meant to rest on a flat surface at a comfortable level, such as a tabletop or the floor, with the player seated behind it. This way, it can be used like an arcade game joystick -- with one hand using the joystick and the other manipulating the buttons.
The Advantage is a rather advanced controller, with variable-speed turbo that can be flipped on or off with a button, pseudo-slow motion (basically toggling the Start button rapidly), and the ability to plug into both controller ports (useful for games that had an alternating two-player mode, like Super Mario Bros.).
Even more impressive, and less common, is the presence of a "Slow Motion" button on the Advantage. The slow motion button works by repeatedly pausing and unpausing the game, leaving it paused for only a short time interval. This effectively slows down gameplay.
Nintendo NES
NES Game Systems
