For example if the key with the character a is kept

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Unformatted text preview: function keys. These templates are usually made of plastic that nicely fit over the keyboard. The functionality 01 the various function keys is written on tpp of the plastic at the positions of those function keys. With this, a used need not remember the functions assigned to different keys by different software packages. Software Simulated Keys We often come across the situation of entering a non-standard character such as "a" or "±", or a phrase or name such as "Prentice-Hall of India" again and again while preparing a particular document. To allow faster entry of data, a user may reassign a keyboard key to produce them. For example, a user may write a software to reassign the character "#" to the name "Prentice-Hall of India" so that whenever he/she enters the character "#" from the keyboard, the system automatically enters "Prentice-Hall of India" in place of the character #. Such arrangements of making the key produce something different from what it is normally supposed to produce is known as software simulation of the key. Autorepeat Feature Almost all keyboards are designed with the auto repeat feature. According to this feature, if a key remains pressed for the auto repeat initial delay period (usually of the order of 300 milliseconds),, then the character or the functionality of the key starts auto-repeating. For example, if the key with the character "a" is kept pressed, then the characters "aaaaa....." will start appearing on the terminal screen till it is kept pressed. This feature facilitates faster data entry when the same character is to be entered multiple times or when multiple lines or pages have to be skipped. Keyboard Buffer A keyboard buffer is a small memory inside either the terminal or the keyboard in which each keystroke is first saved before being transferred to the computer's main memory for processing. The keyboard buffer usually has capacity to save from a few tens to a few hundreds of keystrokes. Storing of keystrokes in keyboard buffer instead of sending them directly to the main memory makes the user interaction with the...
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This document was uploaded on 04/07/2014.

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