ANATOMY OF COMPUTER-I

 ANATOMY OF COMPUTER-I

INPUT DEVICE
An input unit is a device which accepts instructions and data from the user and communicates these to central processing unit of the computer.
In brief the following function are performed by input unit-

• It accepts data and information from the user.
• It converts these instructions and data into computer acceptable form.
• It passes the converted instruction and data to the central processing unit.

Input device are following-

1. Keyboard
2. Mouse
3. Scanner
4. Joystick
5. Light pen
6. Camera
7. Microphone

Keyboard 
Keyboards are designed for the input of text and characters and also to control the operating of a computer.
We can classify the keys of keyboard in six type of understand anatomy as-

• The alphanumeric key             [A to Z, 0-9, Special Symbol]
• The numeric keypad                 [0-9]
• The function keys                      [F1-F12]
• Special purpose keys                [Sleep, Power, Volume etc]
• Modifier keys                             [Shift, Alt, Ctrl]
• Movement keys                         [Up, Down, Left and Right]

Mouse
Mouse is an online input device which can be used by single hand. By moving a mouse on a plane surface.

   Mouse has two or more buttons. Left hand side button is most in use while right hand side button is used in special cases sufficing special purpose. A mouse is generally used to navigate pointer on the screen and to draw pictures and graphics.

Scanner

Scanner is the input device which input data on the paper in the graphics, picture or texts directly into the computer.

OCR, OMR, MICR are the examples of scanner only. Now-a-days variety scanners are available for personal computers with resolutions starting form 300DPI [Dot per inch]. Resolutions refer to the clarity of scanned picture.  The no of dots in a unit area in a picture is called resolution.

Joystick

Joystick is an input device generally used for playing video game.

Light pen

Light pen is used draw any picture or graphics on the computer screen.

A light pen consists of a light sensitive pen like device to select object on a display screen. Any graphic drawn using light pen can be saved into computer and even can be modified and resized.

Camera

Camera is an input device which can store any photograph and movie. After storing camera connect in computer, photo ı are movie transfer in computer.

Bar code reader

Bar code reader is one of the used to read bar code written on the packet of the products. Bar code contains price and other product related information.

ATM [Automatic Teller Machine]

ATM’s are wonderful devices usually come across on the bank campuses, snooping malls, railway stations, airports, bus stands, and public places. These are actually specialized from the input devices for transactions processing.