n-key rollover


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n-key rollover

[′en ‚kē ′rōl‚ō·vər]
(computer science)
The ability of a computer-terminal keyboard to remember the order in which keys were operated and pass this information to the computer even when several keys are depressed before other keys have been released.

n-key rollover

The number of keyboard keys that can be depressed and held down while all keys input the appropriate character. For example, if pressing A, S and D in sequence without lifting the fingers from all three keys generates ASD on screen, the keyboard has 3-key rollover (3KRO), which is necessary for fast touch typing. Gamers and Braille users generally require 6-key rollover (6KRO).

Test the Rollover
To test the rollover number, press three, then four and then five keys simultaneously. If they all display on screen, the keyboard has rollover for that number of keys.
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References in periodicals archive ?
The Zebronics Max Pro supports N-key rollover just like its predecessors.
The durable switches are rated for 20 million presses, so they can withstand heavy use, and N-key rollover ensures each press registers precisely regardless of how many keys are mashed at once.
The upgraded TactX keyboard and n-key rollover enable more than 100 key commands for maximum actions per minute.
Additional features include a Game Mode, N-Key Rollover, and anti-ghosting.