computer system
TRANSCRIPT
COMPUTER SYSTEMSOFTWARE
{WILL BE DEALT LATER}HARDWARE
The physical components of aComputer system are called
HARDWARE
A computer system basically consists of:-
Input unit Processing unitOutput unit
INPUT UNITIT IS A UNIT WHICH TAKES INPUT
FROM THE USER & CONVERTS INTO BINARY
INPUT DEVICESKEY BOARDMOUSELIGHT PENJOY STICKTRACK BALLGRAPHICS TABLETSCANNERDIGITAL CAMERAMAGNETIC INK CHARACTER READEROPTICAL CHARACER READEROPTICAL MARK READERBAR CODE READERTOUCH SCREENMICRO PHONE
IT TAKES INPUT FROM THE KEYS PRESENT ON IT& CONVERTS INTO BINARY FORM ,FOR THE COMPUTER THEN THE COMPUTER USES THE BINARY DIGITS TO GIVE OUTPUT.THE COMMONLY UDED INPUT DEVICE BY EVERY USER
KEY BOARD
IS A POINTING DEVICE.
MOUSE
IS A POINTING DEVICE THAT CAN BE USED TO SELECT AN OPTION ON THE SCREEN BY SIMPLY POINTING.
CAN ALSO DRAW PICTURES USING IT. USED BY ARTHITECTS,ENGINEERS OR DESIGNERS.
LIGHT PEN
Track ball
It has a ball that can be rotated in different directions to move the cursor on the screenFound in laptops
Joy stickIt consists of a vertical stick which is used to control screen objects.Used to play computer games.It provides better control than key board.
Graphics tablet
Allows a user to create digital drawings by hand on a flat surface using a special pen called STYLUS
SCANNER
IT SCANS THE OBJECT PLACED & CONVERTS IT INTO A DIGITAL FILE
Digital cameraIt takes video &still images or both .Used in movie shootings , for photography etc.
Magnetic Ink Character Reader
Human –readable characters are printed on documents like cheques using a special ink that contains magnetic particles of iron oxideUsed in cheques
Optical character reader
Used to detect alphabetical and numerical characters on a page or hand written text .It makes data entry simple and faster.
Optical mark reader
It is used to identify pre – specified type of marks on a sheet.Only compactable with pencil marks or ink.Used for multiple choice question answer sheets.
Bar code reader
It reads print of vertical bars mostly found on grocery items which contains data about the product and the manufacturer.Used in grocery stores.
Touch screen
It allows us to select a thing on the screen by just touching it Used in mobiles, airline and railway reservations
Microphone
Microphone is a input device used to transmit the human speech into electrical signals to the computer then ,the trained computer finds match to the signal and identifies input.
PROCESSING UNIT
Machine LanguageAssembly LanguageHigh Level Languages
COMPUTER LANGUAGES
Machine Language
Can be Easily understood by the computerIn the form of 0s and 1s.No translation required.Difficult to write.
Done by praneeth