The arcade machine features both Ms. Pac-Man and Galaga, both of which were developed in 1981 (although Ms. Pac-Man was commercially released in 1982). The original Pac-Man is also an unlockable game, playable by entering a secret joystick combination. Each game can be set (by the arcade operator) to run in its standard mode or its "speed-up chip" mode by default; the other speed setting being accessible by another joystick code.
     The Ms. Pac-Man/Galaga machine adds a "continue" feature upon getting a game over, in which the player can insert another quarter to resume their game (while continuing off of their high score). This feature can also be disabled by the arcade operator. High scores appear to be saved into the machine's memory, even if the cabinet is unplugged or turned off.
 
Codes
Pac-Man: Enter Up, Up, Up, Down, Down, Down, Left, Right, Left. Blinky will turn into Pinky, and selecting Ms. Pac-Man will load Pac-Man.
Speed adjuster: Enter Left, Right, Left, Right, Up, Up, Up, Fire. The speed will be changed to slow or fast (speed-up chip), depending on what mode is already set by default.
Specs:
H 68.25"  x  33" D  x  25" W  x  250lbs