Advanced Gravis

Advanced Gravis Computer Technology, Ltd. was a manufacturer of computer peripherals and hardware.Their most famous products were the Gravis PC GamePad, at one time one of the most popular gaming controllers for the PC, the once-ubiquitous Gravis Joystick (black with red buttons), and the Gravis Ultrasound add-on card, competitor to the Sound Blaster. At its peak, the company had almost 300 employees, and was at the time the world's largest manufacturer of computer joysticks and gamepads.