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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 ...
The pause command in DOS requests the user to "Press any key to continue." In computing, "Press any key to continue" (or a similar text) was a historically used prompt to the user when it was necessary to pause processing. The system would resume after the user pressed any keyboard button.
The keyboard controller scans the columns. If a key has been pressed, the controller scans the rows, determines the row-column combination at which a key has been pressed, and generates the code corresponding to that key. This process occurs so quickly that the user is unaware of any delay. [1]
The most commonly encountered are the "XT" ("set 1") scancodes, based on the 83-key keyboard used by the IBM PC XT and earlier. These mostly consist of a single byte; the low 7 bits identify the key, and the most significant bit is clear for a key press or set for a key release. Some additional keys have an E0 (or rarely, E1 or E2) prefix.
WhatPulse is a key-counting program that monitors computer uptime, bandwidth usage and the number of keystrokes and mouse clicks made by a user over a period of time. Unlike keyloggers, the authors claim WhatPulse does not record the order in which keys are pressed but instead counts the number of times keys are pressed. [2]
The keyboard controller also handles PS/2 mouse input if a PS/2 mouse port is present. Today the keyboard controller is either a unit inside a Super I/O device or is missing, having its keyboard and mouse functions handled by a USB controller and its role in controlling the A20 line becoming integrated into the chipset's northbridge and then ...
In computing, a modifier key is a special key (or combination) on a computer keyboard that temporarily modifies the normal action of another key when pressed together. By themselves, modifier keys usually do nothing; that is, pressing any of the ⇧ Shift, Alt, or Ctrl keys alone does not (generally) trigger any action from the computer.
A hardware interrupt generated when a key is pressed or released, see keyboard controller (computing) Topics referred to by the same term This disambiguation page lists articles associated with the title Keyboard interrupt .