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Key rollover is the ability of a computer keyboard to correctly handle several simultaneous keystrokes. A keyboard with n-key rollover (NKRO) can correctly detect input from each key on the keyboard at the same time, regardless of how many other keys are also being pressed. Keyboards that lack full rollover will register an incorrect keystroke ...
A common test for whether the computer has crashed is pressing the "caps lock" key. The keyboard sends the key code to the keyboard driver running in the main computer; if the main computer is operating, it commands the light to turn on. All the other indicator lights work in a similar way.
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The cheap plastic office keyboard sitting at your desk is likely a membrane keyboard. These boards use a rubber sheet (membrane) with electrical switches to register each keypress.
The two operating modes of keyboard section are 2-key lockout and n-key rollover. In the 2-key lockout mode, if two keys are pressed simultaneously, only the first key is recognized. In the N-key rollover mode, simultaneous keys are recognized and their codes are stored in FIFO. The keyboard section also has an 8 x 8 FIFO (First In First Out) RAM.
The USB HID keyboard interface requires that it explicitly handle key rollover, with the full HID keyboard class supporting n-key rollover. However, the USB boot keyboard class (designed to allow the BIOS to easily provide a keyboard in the absence of OS USB HID support) only allows 6-key rollover. Some keyboard peripherals support only the ...
These early keyboards had "n-key" rollover, which means any number of keys can be depressed and the keyboard will still recognize the next key depressed. But when three keys are pressed (electrically closed) at the same time in a "direct contact" keyswitch matrix that doesn't have isolation diodes, the keyboard electronics can see a fourth ...
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