Posted by : Waqas Javed Wednesday, 24 September 2014

Keyboard is an important input used device. Its is the first peripheral to be connected with computers. A standard keyboard contain 101 keys each of which send different signal to the CPU to process and let it know which key is pressed

Standard Key-Board Layout
          Among IBM-Compatible computers, the most common keyboard layout is that called IBM-Enhanced keyboard. It arrange 101 keys in 5 groups.

IBM-Compatible computer
           refers to any PC based on the first personal computer made by IBM. Toady an IBM compatible computer refer to any PC other than Macintosh computers.

Keys Grouping
          The five groups of keyboard in which keys are arranged are:

  •  Alpha-Numeric keys:  Area that look like a type writer is called Alpha Numeric keys. These                                           keys include all the characters keys and also digits. Together with that                                         it also include four other keys as well which include 

    • TAB:                  It move the selection to next tab. Also induce tabs space in word.
    • CAPS-LOCK:    By pressing this you will enable the upper case letter so character will                              be written capital. 
    • BACKSPACE:  It is used to erase character.
    • ENTER.             It is used to click the selected option. Or to execute the function or                                    program which is selected

  • Modifier Keys:              Modifier keys are three in number their basic function is to modify the                                       function of other keys that's why they are called modifier keys. These                                         three modifier keys are:
    • Shift:                   This serve the function of caps lock but in using this key is different                                   from caps lock as you have to hold this key to use this. So when you                                 have to write a long data in capital you enable caps lock for ordinary                                 usage when you write some capitals letter you use shift key.
    • Alt:                     Alt is the term for alternate. If you hold this key and press a number a                                symbol will b written. Its combination is used for creating shortcuts.
    • Ctrl:                    This is called control key its combination with different keys is used for                            shortcuts.
  • Numeric Keys:            These keys are situated at the right side of keyboard. It is like a                                                    calculator pad consist of digits and numeric operator like +, -, / and *. It                                      also contains a Num-Lock key which when disabled the numeric pad                                          behave like cursor or mouse.
  • Function Keys:            These are arranged as a row on the top of keyboard. They are usually 12                                      in number labelled as F1, F2, F3, ....... They are used to specialized                                              function. For example F1 is usually for help of any program. Its                                                    functioning depend upon the software.
  • Cursor-Movement       These keys are four in number used to move around the cursor on            Keys:                           screen.
  • Special Purpose Keys: They are basically six keys viz INSERT, HOME, DELETE, END,                                              PAGE UP, PAGE DOWN.
                                              after 1996 Together with them there are two other function keys called                                                 start and shortcut.
Esc:                                        There is another single key at top left of keyboard. Its function is to                                                 move one step back in multi-levels.
          

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