Located in San Mateo
, this company ("Gravis" = Latin
for "heavy") produces gamepads
and other PC
game controllers. It was founded in 1985 by "two serious gamers" (quote www.gravis.com).
These days, Gravis still produces popular game controllers like the Xterminator, Eliminator and Destroyer series. They have discontinued their series of soundcards (such as the Gravis Ultrasound, an extremely popular soundcard in it's time), though, and now only concentrate on controllers.