R.O.B. [ Robotic Operating Buddy ], released in Japan as the Family Computer Robot, and is an accessory for the Nintendo Entertainment System (NES). It was launched in July 1985 in Japan, and October 1985 in North America.
R.O.B. receives commands via optical flashes in the screen. Once the screen lights up, R.O.B. is ready to receive six commands. Just like the NES Zapper, R.O.B. only functions correctly when coupled with a television. Both Gyromite and Stack-Up include a test feature, sending an optical flash that should make R.O.B.'s LED light up.
The R.O.B. unit's height is 24 cm (9.6 in). It has a head movement range of a 45° horizontally centered tilt. The arm movement range is 240° left and right with five stopping points, 7 cm (2.75 in) up and down with six stopping points, and 7 cm (2.75 in) between hands when open. The unit has five accessory slots around the hexagonal base, numbered clockwise, starting at the rear-left from the robot's point of view; and notches on the hands allow for specialized parts to be attached for each game. The optional tinted filter can be attached over the eyes to compensate for overly bright televisions. The unit is powered by four AA batteries.