Information Technology

Appalo Computer Sytem

Information Technology

Harsha S. WijethungaDip in NIBM, ASLIM, Dip. In HRM, HND in Computer System Design

Appalo Computer Sytem

COMPUTER BASIC PART

MONITOR

SPEAKER

KEYBOARD

MOUSE

CPU

CD-Drive

DVD Drive

Floppy Drive

Flash drive

INPUT DEVICE

OUTPUT DEVICE

SYSTEM UNIT

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WHAT IS THE COMPUTER

A computer is a programmable electronic device that can store, retrieve, and process data.Computer is an electronic device that accepts the data. Process it and give the result.

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WHAT IS COMPUTER DATA & INFORMATION

INPUTCPU

MAIN MEMORY

OUTPUT

DATA INFORMATION

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DATA Input user or other

users May be Number,

text, Sound ,Image May be unintelligible Maybe command or

instruction

INFORMATION Out put from the

computer Is formatted and

understandable Can be printed text,

graphics, images Can be sounds or

video

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What is a Computer?

A computer is an electronic device that manipulates information or "data." It has the ability to store, retrieve, and process data. You can use a computer to type documents, send email, and surf the Internet. You can also use it to handle spreadsheets, accounting, database management, presentations, games,

and more.

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Whether you realize it or not, computers play an important role in our lives. When you withdraw cash from an ATM, scan groceries at the store, or use a calculator, you're using a type of computer.

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Software and HardwareIf you use a player piano as an analogy, the piano can be thought of as the hardware and the roll of music as the software.

The software a series of very simple computer instructions carefully organized to complete complex tasks. These instructions are written in programming languages (like BASIC, PASCAL, C...) to help simplify the development of applications.

The hardware is what sits on your desk and executes the software instructions. The player piano is useless unless the roll of music has been written correctly.

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Input Devices – "How to tell it what to do"A keyboard and mouse are the standard wayto interact with the computer. Other devices include joysticks and game pads used primarly for games.

Mouse, Keyboard, Joystick, Image Scanner, Webcam, Graphics tablet, Microphone, Light Pen, MICR, OCR, Bar Code Reader

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Output Devices -- "How it shows you what it is doing"

The monitor (the screen) is how thecomputer sends information back to you, whether it be surfing the web or writing a memo. A printer is also an output device.

Monitor, Printer, Speaker, Head Phone, Plotter

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Peripheral device Input/output

InputMouse, Keyboard, Joystick, Imagescanner, Webcam

, Graphics tablet, MicrophoneOutputMonitor, Printer, LoudspeakerBothFloppy disk drive, Hard disk drive, Optical disc drive,Teleprinter

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What is “hardware” ? All the bits that

plug together are hardware System Unit Screen Keyboard Mouse Printer Scanner etc

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What is “software” ? Computer programs

and applications are software

They enable the computer to carry out the tasks we need

It is important to choose the right software for the job…

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