![]() Standard USB keyboards can also be connected to some non-desktop devices. Computer keyboards are similar to electric-typewriter keyboards but contain additional keys. Also the 'enter' key is usually shaped differently. The internationally-common 102/105 key keyboards have a smaller 'left shift' key and an additional key with some more symbols between that and the letter to its right (usually Z or Y). Desktop computer keyboards, such as the 101-key US traditional keyboards or the 104-key Windows keyboards, include alphabetic characters, punctuation symbols, numbers and a variety of function keys. Standard "full-travel" alphanumeric keyboards have keys that are on three-quarter inch centers (0.750 inches, 19.05 mm), and have a key travel of at least 0.150 inches (3.81 mm). Alternatively a tool is used for pressing small keys. Reduction is limited by the practical consideration that the keys must be large enough to be easily pressed by fingers. ![]() ![]() ![]() See also text entry interface.Īnother factor determining the size of a keyboard is the size and spacing of the keys. A keyboard with few keys is called a keypad. One factor determining the size of a keyboard is the presence of duplicate keys, such as a separate numeric keyboard, for convenience.įurther the keyboard size depends on the extent to which a system is used where a single action is produced by a combination of subsequent or simultaneous keystrokes (with modifier keys, see below), or multiple pressing of a single key. It is the only way to enter commands on a command-line interface. A keyboard is also used to give commands to the operating system of a computer, such as Windows' Control-Alt-Delete combination, which brings up a task window or shuts down the machine. Keyboards are also used for computer gaming, either with regular keyboards or by using keyboards with special gaming features, which can expedite frequently used keystroke combinations. A computer keyboard distinguishes each physical key from every other and reports all key presses to the controlling software. In a modern computer, the interpretation of key presses is generally left to the software. In normal usage, the keyboard is used to type text and numbers into a word processor, text editor or other program. While most keyboard keys produce letters, numbers or signs (characters), other keys or simultaneous key presses can produce actions or computer commands. However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. With the decline of punch cards and paper tape, interaction via teletype-style keyboards became the main input device for computers.ĭespite the development of alternative input devices, such as the mouse, touchscreen, pen devices, character recognition and voice recognition, the keyboard remains the most commonly used and most versatile device used for direct (human) input into computers.Ī keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. In computing, a keyboard is a typewriter keyboard, which uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches.
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