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The overlay was often made from good-quality laminated paper and was designed to fold up and fit in the game's packaging when not in use.
When a key is pressed, the keyboard does not send a message such as the A-key is depressed but rather the left-most main key of the home row is depressed.
Compared with the ANSI layout top leftthe enter key is vertical rather than horizontal. In addition, the left shift key is smaller, to make room for an additional key to its right.
For example, the "ISO" keyboard layout is used throughout Europe, but typical French, German, and UK variants of mechanically identical keyboards appear different because they bear different legends on their keys. Mechanical, visual, and functional layouts[ edit ] As noted before, the layout of a keyboard may refer to its mechanical physical arrangement of keysvisual physical labeling of keysor functional software response to a keypress layout.
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Technically, each key has an internal reference number, "raw keycodes", and these numbers are what is sent to the computer when a key is pressed or released.
Mixed hardware-to-software keyboard extensions exist to overcome above discrepancies between functional and visual layouts. Visual layouts vary by language, country, and user preference, and any one mechanical and functional layout can be employed with a number of different visual layouts.
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In the past, complex software that mapped many non-standard functions to the keys such as a flight simulator would be shipped with a "keyboard overlay", a large sheet of paper with pre-cut holes matching the key layout of a particular model of computer.
Visual layouts[ edit ] A visual layout consisting of both factory-printed symbols and customized stickers. A keyboard overlay  is a plastic or paper masks that can be placed over the empty space between the keys, providing the user with the functional use of various keys.
Thus, a touch typist can type various foreign languages with a visible English-language keyboard only. Mechanical layouts[ edit ] A comparison of common mechanical layouts.
In fact, the mechanical layouts referred such as "ISO" and "ANSI" comply to the primary recommendations in the named standards, while each of these standards in fact also allows the other way.
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The United States keyboard layout is used as default in the currently most popular operating systems: Here it is the right-hand shift key that is smaller. The JIS mechanical layout bottom right is the basis for Japanese keyboards.
The user of the computer is requested to identify the functional layout of the keyboard when installing the operating system.
However, most operating systems have software that allow the user to easily switch between functional layouts, such as the language bar in Microsoft Windows. Usually the functional layout is set to match the visual layout Concluding chapter thesis the keyboard being used, so that pressing a key will produce the expected result, corresponding to the legends on the keyboard.