Hewlett Packard 54645 series Oscilloscope (included game)

The Hewlett Packard 54645 series Oscilloscopes include a game as an Easter egg or, at least, undocumented feature. The game is summoned when pressing the second and third softkeys simultaneously.

The game is a variant of Centipede. The player is positioned at the bottom of the screen and fires upwards to the top of the screen. The player can shoot mushrooms and a large centipede which when hit spawns more mushrooms. The player can move left, right, up and down and fire their wand. Each hit scores points and the player loses a life when coming in contact with the Centipede.