Computer system

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