computer keyboard definition

In certain programs for playback of digital video, the space bar is used for pausing and resuming the playback. Illumination facilitates the use of the keyboard or keypad in dark environments. The Break key can be used by software in several different ways, such as to switch between multiple login sessions, to terminate a program, or to interrupt a modem connection. Over time, less key travel was accepted in the market, finally landing on 0.110 inches (2.79 mm). However, producing some symbols may require pressing and holding several keys simultaneously or in sequence. In 1978, Key Tronic Corporation introduced keyboards with capacitive-based switches, one of the first keyboard technologies not to use self-contained switches. In software keyboards, the mouse has to be maneuvered onto the on-screen letters given by the software. Typically handheld keyboards hold all the alphanumeric keys and symbols that a standard keyboard would have, yet only be accessed by pressing two sets of keys at once; one acting as a function key similar to a 'Shift' key that would allow for capital letters on a standard keyboard. Desktop computer keyboards include alphabetic characters and numerals, typographical symbols and punctuation marks, one or more currency symbols and other special characters, diacritics and a variety of function keys. Court reporters' stenotype machines use chorded keyboards to enable them to enter text much faster by typing a syllable with each stroke instead of one letter at a time. Keyboards on laptops are of course integrated, but technically would be considered "wired" since that's how they are connected to the computer. Wireless keyboards need batteries for power, and may be at risk of data eavesdropping. Some of the effects of a modifier key can be seen on the keyboard as keys that have two actions, like the 7 key. Software keyloggers work on the target computer's operating system and gain unauthorized access to the hardware, hook into the keyboard with functions provided by the OS, or use remote access software to transmit recorded data out of the target computer to a remote location. This was possible because of molding techniques that could provide very tight tolerances for the switch-plunger holes and guides across the width of the keyboard so that the key plunger-to-housing clearances were not too tight or too loose, either of which could cause the keys to bind. One test for whether the computer has crashed is pressing the caps lock key. The alphabetical, numeric, and punctuation keys can also have other functions when they are pressed at the same time as some modifier keys. "Dead keys" allow placement of a diacritic mark, such as an accent, on the following letter (e.g., the Compose key). If the computer were watching for each pulse, it would see many keystrokes for what the user thought was just one. It was through such devices that modern computer keyboards inherited their layouts. This produces a clicking sound and gives physical feedback for the typist, indicating that the key has been depressed.[41]. Tim Fisher has 30+ years' professional technology support experience. A wireless keyboard may use industry standard Bluetooth radio communication, in which case the receiver may be built into the computer. Analog keyboards with key switches whose activation distance can be reconfigured through software, optical switches that work by blocking laser beams, and Hall Effect keyboards that use key switches that use a magnet to activate a hall sensor, are also available. Prior to the iMac line of systems, Apple used the proprietary Apple Desktop Bus for its keyboard connector. "Electrical commutation matrixer keyboards for computers", "This Fake Phone Charger Is Actually Recording Every Key You Type", "How To Login From an Internet Cafe Without Worrying About Keyloggers", "6 Tips To Secure Webcams, Stop Keyloggers", "How To Prevent Carpal Tunnel Syndrome: 9 Hand & Wrist Exercises", "Art of Assembly Language: Chapter Twenty": The PC Keyboard,, Short description is different from Wikidata, Articles with unsourced statements from August 2020, Articles with unsourced statements from August 2013, Creative Commons Attribution-ShareAlike License. Some hackers also use wireless keylogger sniffers to collect packets of data being transferred from a wireless keyboard and its receiver, and then they crack the encryption key being used to secure wireless communications between the two devices. This key was created at the same time as the Windows key. Other languages have different default formats such as QWERTZ for German and AZERT for French. Multiple interfaces (serial, USB, audio, Ethernet, etc.) There are several ways of connecting a keyboard to a system unit (more precisely, to its keyboard controller) using cables, including the standard AT connector commonly found on motherboards, which was eventually replaced by the PS/2 and the USB connection. Keystroke logging (often called keylogging) is a method of capturing and recording user keystrokes. It is used to launch a context menu with the keyboard rather than with the usual right mouse button. This is undesirable, especially for fast typing (hitting new keys before the fingers can release previous keys), and games (designed for multiple key presses). to the Enter function, essentially removing the former key's capabilities so as to regain use of the latter. Replacing early punched cards and paper tape technology, interaction via teleprinter-style keyboards have been the main input method for computers since the 1970s, supplemented by the computer mouse since the 1980s. The most popular switch types were reed switches (contacts enclosed in a vacuum in a glass capsule, affected by a magnet mounted on the switch plunger). "Monoblock" keyboard designs were developed where individual switch housings were eliminated and a one-piece "monoblock" housing used instead. On many notebook computer keyboards the key labeled Delete (sometimes Delete and Backspace are printed on the same key) serves the same purpose as a Backspace key. The Enter/Return key typically causes a command line, window form or dialog box to operate its default function, which is typically to finish an "entry" and begin the desired process. Early "solid-state" keyswitch keyboards did not have this problem because the keyswitches are electrically isolated from each other, and early "direct-contact" keyswitch keyboards avoided this problem by having isolation diodes for every keyswitch. When released, they bounce some more until they revert to the uncontacted state. [2] While most keyboard keys produce letters, numbers or symbols (characters), other keys or simultaneous key presses can prompt the computer to execute system commands, such as such as the Control-Alt-Delete combination used with Microsoft Windows. data input device, input device - a device that can be used to insert data into a computer or other computational device keyboard - device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like Based on WordNet 3.0, Farlex clipart collection. [50] Wrist or palm rests should not be used while typing.[51]. In addition to numbers, this pad has command symbols concerned with calculations such as addition, subtraction, multiplication and division symbols. Compact keyboard layouts often use a Fn key. [39] There was simply a sponge pad with a conductive-coated Mylar plastic sheet on the switch plunger, and two half-moon trace patterns on the printed circuit board below. [30] The DEC VT50, introduced July 1974, also had an Esc key. [3][4] In a modern computer, the interpretation of key presses is generally left to the software: the information sent to the computer, the scan code, tells it only which key (or keys) on which row and column, was pressed or released.[5]. The 1984 Apricot Portable is an early example of an IR keyboard. The TECO text editor (ca 1963) and its descendant Emacs (ca 1985) use the Esc key extensively. ESC was part of the standard keyboard of the Teletype Model 33 (introduced in 1964 and used with many early minicomputers). On modern keyboards, the break key is usually labeled Pause/Break. ), and a few function keys. Initially, sublimation printing, where a special ink is printed onto the keycap surface and the application of heat causes the ink molecules to penetrate and commingle with the plastic modules, had a problem because finger oils caused the molecules to disperse, but then a necessarily very hard clear coating was applied to prevent this. Coincident with sublimation printing, which was first used in high volume by IBM on their keyboards, was the introduction by IBM of single-curved-dish keycaps to facilitate quality printing of key legends by having a consistently curved surface instead of a dish. The function of these keys isn't as obvious because the instructions for using it aren't laid out on the keyboard like the 7 key is. They are often used to facilitate data entry with smaller keyboards that do not have a numeric keypad, commonly those of laptop computers. Though most of us use a keyboard nearly every day, there are many keys you probably don't use, or at least aren't sure why you use them. It is one of the most used input devices for computers.

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