Key jamming
From Wikipedia, the free encyclopedia
Key jamming occurs when two or more keys on a keyboard that aren't normally depressed are depressed simultaneously, and the keyboard controller can't interpret them all, causing the computer to only recognize that some or none of the keys have been pressed. Which keys "jam" when pressed together differs between brands and models of keyboards.
Key jamming is most often noticed when using a keyboard to play action-oriented computer games. The original Star Control game included a utility to test for key jamming and help the player determine the best key mapping for his/her keyboard, since during gameplay it was common for each of the two players to be pressing three or four keys at the same time.
Most modern action-oriented computer games and console emulators use the control, alt, and shift keys by default, since they are always designed to be pressed in combination with other keys, and thus usually circumvent key jamming.
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