Input device of Comupter

Input Devices

Following are few input devices are used in Computer.

1. Keyboard
2. Mouse
3. Light pen
4. Joy Stick
5. Track Ball
6. Graphic Tablet
7. Scanner
8. Microphone
9. Optical Mark Reader
10. Bar Code Reader
11. Magnetic Ink Card Reader
12. Optical Character Reader

1. Keyboard

• Keyboard is very popular  input device and the most common which in inputting data to the Computer.
• The Keyboard of the layout is  like that of conventional typewriter although there are some additional key provided for performing additional functions.

Keyboard are of two sizes 84 keys and 101/102 keys, but now the keyboard with 104 keys and 108 keys are also available for Windows or Internet.

The key on the Keyboard are are as following......

• Function Keys :-  F1 to F12.

• Numeric Keys :-  0 to 9

• Alphabetic keys:- A to Z.

• Special Keys :- ctrl, alt, shift.

• Non Printable Keys :- Tab, Enter, Space bar.

• Editing Keys :- Delete, Back space, Insert.

• Symbolic Keys:- @,  #,   (,  $,  %,    ),  etc.

Arrow Keys

                                  

5. Page Up

6. Page Down

7. Home

8. End

Cursor Movement Command

Home :- Move to the start of the current line.

End :- Move to the end of the current line.

Page Up :- Scroll up one screen.

Page Down :- Scroll up down one screen.

ctrl+up :- Scroll up one line.

ctrl+Down :- Scroll down one line.

ctrl+PageUp :- Scroll left one screen.

ctrl+PageDown :- Scroll right one screen.

ctrl+Home :- Scroll to the start of the document.

ctrl+End:- Scroll to the end of the document.

ctrl+Left :- Move left one word.

ctrl+Right :- Move right one word.

2. Mouse

Mouse is most Popular pointing device. Mouse can be used to control the position of cursor on screen but it cannot be used to enter text into the computer. Generally it has two buttons called left and right button and a wheel present between the buttons.

It is a very famous cursor control device having a small palm size box with a round ball at its base which senses the movement of mouse and sends corresponding signals to CPU when the mouse buttons are pressed.

• Easy to use the mouse.
• Not very expensive
• move the cursor faster then the arrow keys of keyboard.

3. Light Pen

Light pen is used to select a displayed menu item or draw picture on the monitor screen. Light pen is a devices which is similar to a pen. When the tip of a light of a light pen is moved over the monitor screen ad pen button is pressed. It is consists of a photocell and an optical system placed in a small tube. Its photocell sensing element detects the screen location and sends the corresponding signal to the CPU.

                                         

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