CHAPTER
COMPUTER DEVICE AND THE HARDWARE
INPUT DEVICE
THE DEVICE WHICH IS USED FOR TO SEND THE INFORMATION AND THE INSTRUCTION TO THE COMPUTER IS KNOWN ANS INPUT DEVICE.
KEYBOARD:- it is a just like a type writer they concisting 105-108 keys they send information as data.
It is devided into four parts. it developed by Kristopher lethom sholege
Main pad (A to Z)
Function keypad (f1 to f12)
Numerical keypad (o to 9)
Special keypad) (chift,num,ctrl,etc.)
Mouse:- it is an pointer device which is shown in the computer screen. This is user friendly. It developed by the scientist dug anglebard.
Scanner:- it is used for send pictures photograph in the computer.
Light pen:-it is used to draw the graphics. Stylus use to run computer screen.
Joy stick:- these are used to play the game on the computer.
BCR:- (bar code reader) it is used to check the bar code on the product and give their full information deeply of the product.
OMR:-(optical mark reader) it is used to check the optical mark in the OMR answer sheet.
OCR:- it is used to check the answer sheet letters applications in the university.
MICR:- (magnetic ink character reader) it is use in the banks for to scan the magnetic code insert in the cheaque.
OUTPUT UNIT
these device are used to produced the fresh result that is after processed.
Monitor:-
A monitor
or a display (also called screen or visual display unit)
is an electronic visual display for computers. The
monitor comprises the display device, circuitry and an enclosure. The display
device in modern monitors is typically a thin film transistor liquid
crystal display (TFT-LCD) thin panel, while older monitors use a (CRT) cathode ray tubeabout as deep as the
screen size.
Originally, computer monitors were used for data
processing while television receivers were used for
entertainment. From the 1980s onwards, computers (and their monitors) have been
used for both data processing and entertainment, while televisions have
implemented some computer functionality. The common aspect
ratio of televisions, and then computer monitors, has also changed
from 4:3 to 16:9 (and 16:10)
devided into 25row and 80 column these pictures are made on the screen in pixals these are two types
1-color monitor
2-monochrome monitor
Printer:-these are also a output device that produced the result by printing or paper they are several types.
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