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The crumbs, dust, and other particulate that fall between the keys and build up underneath are loosened by spraying pressurized air into the keyboard, then removed with a low-pressure vacuum cleaner. A plastic-cleaning agent applied to the surface of the keys with a cloth is used to remove the accumulation of oil and dirt from repeated contact ...
The small pieces punched out by a keypunch fell into a chad box, [2] [3] or (at IBM) chip box, or bit bucket. In many data processing applications, the punched cards were verified by keying exactly the same data a second time, checking to see if the second keying and the punched data were the same (known as two pass verification ).
[6] [7] Reed switches in keyboards have largely been superseded by Hall effect switches. [8] PKM 1B (left) next to Cherry MX. Electric and electronic pedal keyboards used by pipe organ and Hammond organ players often use reed switches, where the glass enclosure of the contacts protects them from dirt, dust, and other particles. They may also be ...
Portable electronic keyboards became a regular feature of rock-and-roll music during the 1960s. They are also more convenient to move and store than are the large one-piece organs that had previously defined the market. By the late 1960s, the home organ market was dying while the portable keyboard market was thriving.
Laptops contain the keyboard, display, and processor in one case. The monitor in the folding upper cover of the case can be closed for transportation, to protect the screen and keyboard. Instead of a mouse, laptops may have a touchpad or pointing stick. Tablets are portable computers that use a touch screen as the primary input device. Tablets ...
Typing on a laptop keyboard. A computer keyboard is a built-in or peripheral input device modeled after the typewriter keyboard [1] [2] which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches.
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The majority of modern keyboards include a control processor and indicator lights to provide feedback to the user (and to the central processor) about what state the keyboard is in. Plug-and-play technology means that its "out of the box" layout can be notified to the system, making the keyboard immediately ready to use without the need for ...
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