In addition, many keyboard standards (for example, IBM PC compatible standards) allow the keyboard itself to generate " typematic" repeating keys by having the keyboard itself generate the pressed-key scancode repeatedly while the key is held down, with the release scancode sent once when the key is released. Some keyboard standards include a scancode for each key being pressed and a different one for each key being released. However, many types of computers still use their traditional scancodes to maintain backward compatibility. This cost difference is not as profound as it used to be. Mapping key positions by row and column requires less complex computer hardware therefore, in the past, using software or firmware to translate the scancodes to text characters was less expensive than wiring the keyboard by text character.
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