Computer Input Devices

  • 8Following are few of the important input device which are used in a computer
    • Keyboard
    • Mouse
    • Joy stick
    • Light pen
    • Track Ball
    • Scanner
    • Graphic Tablet
    • Microphone
    • Magnetic ink card Reader (MICR)
    • optical character Reader (OCR)
    • Bar code Reader
    • Optical Mark Reader (OMR)
    Keyboard

  • Keyboard is the most important and very popular input device which helps in inputting data to the computer. the layout of the keyboard is like that of traditional typewriter, although there are some additional keys provided for performing additional functions. keywords are of two size of 84 keys or 101/102 keys but now keyboard with 104 keys or 108 are also available for Windows and internet.

The keys on the keyboard are as follows:
Sr no. Keys Description
1. Typing keys
this keys include the letter keys (A-Z) and digit keys (0-9) which generally give same layout as that of typewriters

2. Numerical Keyboard ___ it is used to enter data aur cursor movement generally it is consist of a set of 17 keys that are laid out in the same configuration used by most adding machines and calculators.

3. Functions keys
___ the 12 Function key are present on the keyboard which are arranged in a row at the top of the keyboard is function key has unique you meaning and is used for some specific purpose.

4. Control keys ______ desk is provide cursor and screen control. It includes for directional Arrow keys. Control keys also include home, insert ,delete ,page up, page down ,control (Ctrl),alternet (Alt),escape (Esc)..

5. Special purpose keys _____ keyboard also contains some special purpose keys such as enter , shift ,caps lock, num lock,, space bar, tab and print screen.

 

2. Mouse

3. Joystick 

 

Joystick is also a pointing device which is used to move cursor position on a monitor screen it is a stick having a spherical ball at its both lower and upper and the lower spehrical ball moves in a socket the Jester can be moved in a four direction.
The function of joystick is similar to that of a mouse it is mainly used a computer aided designing (CAD) and playing computer games.

4) Trackball
Track ball is an input device that is mostly used in notebook or laptop computer instead Amma house this is a ball which is half inserted and by moving fingers on ball pointer can be moved since the whole device is not move a trackball requires less space than a mouse trackball comes in in various shapes like a ball a button and a square.

  • 5 )scanner
    Scanner is an input device which works more like a photocopy machine it is used when some information is available on a paper and it is to be transferred to the hard disks of the computer for further manipulation scanner capture image from the source which are then converted into the digital from that can be stored on the disk this images can be edited before they are printed.

6) magnetic ink card reader(MICR)
MICR Input device is generally used in bank because of the large number of the cheque to be processed everyday the bank code number and check number are printed on the cheque with a special type of ink that contains particles of magnetic material that are machine readable this reading process is called magnetic ink character recognition(MICR) The main advantage of is that it is fast and less error prone.

  • 7. Optical character reader(OCR)
    OCR is array input device used to read a printed text ocr scans text optically character by character converts them into a machine-readable code and store the text on the system memory.

8) barcode reader Amazon.comAmazon.com
Barcode reader is a device used for reading barcode data data in form of life and dark lens barcode data is generally used in labelling goods numbering the books etc it may be a handheld scanner or may be embedded in a stationary scanner barcode reader scan a barcode image convert it into a an alphanumeric value which is then fed to the computer to which barcode reader is connected.

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