CHAPTER 1ALL ABOUT COMPUTER

Rak na ituu!!!

WHAT IS A COMPUTER?

Can be defined as an electronic device that performs rapid computations and generates desired output for users based on input data and programs.

DATA AND INFORMATION

DATA – is a collection of unprocessed items, which include numbers, audio videos, text and images.

INFORMATION – conveys meaning and is useful to people

CHARACTERISTICS OF COMPUTER

1. SPEED – millisecond (thousandth), microsecond (millionth), nanosecond (billionth) and picosecond (trillionth).

1 second

CHARACTERISTICS OF COMPUTER

2. ACCURACY – process data according to the sequence of instructions.

CHARACTERISTICS OF COMPUTER

3. HUGE STORAGE AND FAST RETRIEVAL

MEMORY TYPES: MAIN MEMORY, CACHE MEMORY AND SECONDARY (AUXILLARY STORAGE).

CHARACTERISTICS OF COMPUTER

4. VERSATILITY

5. FATIGUE-FREE – it doesn’t get tired of work and never loses concentration.

CHARACTERISTICS OF COMPUTER

6. PROGRAMMABLE – can be program to function automatically and this differentiates it from any other calculating device.

7. NETWORKING CAPABILITY – computers can be interconnect into a network.

CATEGORIES OF COMPUTER

1. Personal (desktop)

2. Mobile computers and mobile devices

3. Game consoles

4. Mainframe

5. Supercomputers

6. Embedded computers

CONVERGENCE

Rapidly changing technology, however, the distinction among categories is not always clear-

cut (very definite)

May nag tweet!

PERSONAL COMPUTERS

Is a computer that can perform all of its input, processing, output, and storage activities itself.

2 types of personal computers: desktop computers

notebook computers

DESKTOP COMPUTER

Is designed so that the system unit, input devices, output devices and any other devices fit entirely on under a desk or table.

Ex: gaming desktop, home theatre PC (HTPC)

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MOBILE COMPUTERS AND MOBILE DEVICES

Mobile computer – personal computer you can carry from place to place

Mobile device – similar to Mobile computer but it is small enough to hold in your hand.

notebook computer

NOTEBOOK COMPUTER

Also called as Laptop computer, a portable, personal computer often designed to fit on your lap.

types of notebook

netbook

ultra-thin

TABLET PC’s

Special type of notebook computer that you can interact with by touching the screen with your finger or a digital pen. (uses pressure rather than ink) it also uses voice input so that users can speak to a computer.

Convertible tablet has attached keyboard.

State tablet provides other means for typing.

MOBILE DEVICES

Small enough to carry in a pocket usually do not have hard drives instead using of special memory to store programs and other some use small storage such as memory cards.

Popular types: smart phones and PDA’s, e-book readers, handheld computers, portable media players and digital cameras

SMART PHONES AND PDAs

Smart phone – internet enabled phone, provides information, calendars appointment book, address book, calculator, notepad, send and receive email.

Also provides portable media player, built-in digital cameras, cable of using word processing, spreadsheet, and games.

SMART PHONES AND PDAs

PDA – (Personal digital assistance) differs from smart phone in that is usually does not have phone capabilities and may not be internet-enabled, support voice input, built-in camera, function as portable media player.

handheldsDifficult to differentiate the SP and PDA which

leads some manufacturer to refer them as simply handhelds.

Chura moh!

E-BOOK READERS

Short for electronic book reader or e-reader.

Used for reading books An electronic version of a printed

books Internet-enabled and touchscreen Usually smaller than tablet but larger

than smart phone

HANDHELD COMPUTER

Sometimes referred to as an Ultra-Mobile PC, a small PC that small enough to fit in one hand.

Use wireless technology Digital pen or stylus for input.

PORTABLE MEDIA PLAYER

Is a mobile device on which you can store, organize and play digital media.

Internet-enabled Calendar, address book, games and

other apps.

MP3MP4

MP5MP6

MP7

MP7.50

DIGITAL CAMERAS

Is a device that allows users to take pictures and store photographed images digitally, instead of on traditional film

Internal memory and memory cards Reviewing and modifying while using

camera Wireless technology#SELFIE

GAME CONSOLES

Is mobile computing device designed for single-player or multiple video games.

Standard game consoles use a handheld controller(s) as an input device

Television as output Hard disk and/or memory card as storage

Microsoft xbox 360, nintendos wii, sony’s playstation 3

MAINFRAMES COMPUTER

A large and expensive, powerful computer that can handle hundreds or thousands of connected users simultaneously.

Can also act as server You can use terminals or personal

computers to access the mainframe

SUPERCOMPUTERS

Fastest, most powerful computer – and the most expensive.

Can process more than 1 quadrillion instructions in a single second

Can store 20,000 times than desktop computer

EMBEDDED COMPUTER

Special purpose computer that functions as a component in a larger product

EMBEDDED COMPUTER

Consumer electronics Home automation devices Automobiles Process controllers and robotics Computer devices and office

machines

BASIC FUNCTION OF COMPUTER

INPUT OUTPUTPROCESS

STORAGE

© Copyright 2011 John Wiley & Sons, Inc. 1-32

© Copyright 2011 John Wiley & Sons, Inc. 1-33