COMPUTER HARDWARE - 4


Mouse :- It is hand help pointing device i.e, move across the flat surface and it's movement controls the movement of mouse pointer on the screen.

There are three buttons in a mouse -----

✳️ Left or Selection Button :- This button is used to select anything on screen.

✳️ Middle or Scroll Button :- With this button we can move around the page quickly.

✳️ Right or Shortcut Button :- When we press this button, it displays a shortcut list of related window.


➝ Joystick :- It is a pointing device which is used to play game on computer or any other display devices.

➝ Light Pen :- This device used to draw a line directly on screen.

➝ Track Ball :- It is also a pointing device in which we rotate the ball to move the cursor.

➝ Scanner :- It is very similar to the photocopy machine which is used to scan or create text or image into the computer. The basic function of a scanner is to convert hard copies into soft copies.

Scanner are of two types -----------

✳️ Image Scanner
Hand held
Flatbed 

✳️ Special Purpose Scanner
MICR (Magnetic Ink Character Recognizer)
OCR (Optical Character Recognizer)
BCR (Bar Code Recognizer)
OMR (Optical Mark Recognizer)

Special Purpose Scanner -----

⟶ MICR :- It is used in banks to check demand drops and cheques. 

⟶  OCR :- It is used to recognize written hand text or typed text.

⟶  BCR :- It is used in shopping complex and super market to read the coded price of an item.

⟶ OMR :- It is used to detecting the presence of intended marked response.


1 comment:

INTERNET TECHNOLOGY DFINITION

INTERNET Internet is an connection between several computers of different types belonging to various network across the world. It is ...