Keyboard and Its working in Detail
Most input data is entered into the computer by using a keyboard. This input method is similar to typing on a typewriter. Computer keyboards include keys that are designed to perform specific tasks. These special keys include function keys, directional keys and special-purpose keys such as Alt, Ctrl, Enter, Ins, and Esc. These keys enable the user to perform complex tasks easily when using the application.
For example, many applications use a function key to access online help for the user. Some new keyboards have even 110 keys, with three new keys designed to simplify working with Windows 95. Two of these keys, next to the Alt key, bring up the Start menu. The third key, next to the right Ctrl key, brings up a menu of functions that are frequently accessed in whichever application is currently being used.
Working of Keyboard :
A keyboard is a series of switches connected to a small keyboard microprocessor that monitor the state of each switch and initials a specific response to a change in state. When the user presses a key, it causes a change in the amount of current flowing through the circuit associated specifically with that key. The keyboard microprocessor detects this change in current flow. By doing this, the processor can tell when a key has been pressed and when it is being released. Depending upon which key’s circuit carries a signal to the microprocessor, the processor generates the associative code, known as
‘Scan code’ of the key and sends it to the operating system. A copy of this code is also stored in the keyboard’s memory. When the operating system reads the scan code, it informs the same to the keyboard and the scan code stored in keyboard’s memory is then erased.
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