INTRODUCTION TO COMPUTER

Instructor : Mrs Halimaton Sa’adiah Ariffin E-mail : halimaton@usim.edu.my

Telephone : 06-7987039, Office : MPG, Level 2. No. 1

1. Information Technology

2. Information Communication Technology

3. Information System

4. Computer

5. Data and Information

6. Components of Computer

7. Classification of computer

8. Assignment

http://jobsearchtech.about.com/od/careersintechnology/p/ITDefinition.htm

information technology is the use of computers and software to manage

information.

INFORMATION TECHNOLOGY

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COMMUNICATION

ICT refers to technologies that provide access to information through telecommunications. It is similar to Information Technology (IT), but focuses primarily on communication technologies. This includes the Internet, wireless networks, cell phones, and other communication mediums.

INFORMATION COMMUNICATION TECHNOLOGY

Process in which two or more computers or devices transfer data, instructions and information.

TECHNOLOGY

Technology is the usage and knowledge of tools, techniques, systems or methods of organization in order to solve a problem

INFORMATION

Conveys meaning and is useful to people

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A System is a set of components that interact to achieve a common goal. An information System (IS) is a collection of hardware, software, data, people and procedures that work together to produce quality information.

PEOPLE

People are involved in every aspect of an information system. Users are people who are affected by the information system. If people are going to survive in to day's society they must be users of information. Users can be classified as direct users and indirect users. Computer Uses • Business • Entertainment • Education • Medicine

Direct users Direct users of information systems are people who interact with and are in control of the system. All of the providers of the information services are direct users. Example : system analyst, system managers, operators and data entry personnel. Indirect Users Indirect users of an information system never use the system, but its use by other people and affects them. Example : supermarkets use an information system to complete an inventory of goods. When we buy our groceries we are not using the information system, but its use has affected the service we are receiving.

SOFTWARE

Software refers to a set of instructions that tells the computer on what to do. These instruction sets also called programs which provide a means for us to interact with and use the computer, all without computer programming skills. Computer has two basic types of software : 1. System software 2. Application software

System Software • A collection of programs • Enables the application software to interact with the hardware • Background software that helps the computer manage its own resources Application Software • “End-user” software where you use them to do tasks at home, school and work. • Two major categories

General purpose (writing letters, sending e-mail, balancing a budget, creating presentations) Special purpose (editing photos, specialized business, computer-aided design)

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An electronic device

For data Processing

1. It gathers data (or allows user to input data) 2. It process data into information 3. It outputs data or information 4. It stores data and information

Computer is an electronic device, operating under the control of instructions stored in its own memory, that can accept data, process the data according to specified rules, produce results, and store the results for future use. Computer can performs four major functions :

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IN COMPUTER TERMS

Data is a collection of unprocessed items (raw facts) , which can include text, numbers, images, audio and video. Example : 1. Names (Aril Iskandar) 2. Date of Birth (11 Mei 1987) 3. Place of Birth (Perak - 08) 4. Picture ( ) , 5. etc .

Information is data that has been organized or presented in a meaningful fashion and is useful to people. Example : 1. My Card 2. Poster 3. Database Record

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A computer processes data into information. In this simplified example, the item ordered, item price, quantity ordered, and amount received all represent data. The computer processes the data to produce the cash register receipt (information).

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Computers process data into information in binary language. Binary language consist of just two digits : 0 and 1 (bit) Eight binary digits (or bits) combine to create one byte. (8 bits = 1 byte) In computers, each letter of the alphabet, each number and each special character consists of a unique combination of eight bits, or a string of eight 0s and 1s.

HOW MANY BITS & BYTES IN THE WORD OF

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I C T

• I = 01001001 (8 BITS)

• C = 01000011 (8 BITS)

• T = 01010100 (8 BITS)

8 BITS = 1 BYTE

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I C T

• I = 01001001 (8 BITS)

• C = 01000011 (8 BITS)

• T = 01010100 (8 BITS)

8 BITS = 1 BYTE

TOTAL BITS = (8X3) = 24 BITS = 3 BYTES

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Hardware is the electronic, and mechanical components of a computer that you can physically touch. All hardware on the computer helps the computer to perform its various tasks. These components include : 1. Input devices 2. Output devices 3. A system Unit 4. Storage Devices 5. Communication Devices

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Processing ? Storage?

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Input Devices is any hardware component that allows you to enter data (text , images , sounds) and instructions (user responses , commands) into a computer. Six widely used input devices are the : 1. Keyboard 2. Mouse 3. Microphone 4. Scanner 5. Digital camera 6. PC video camera (Web Cam)

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Computer Keyboard contains keys you press to enter typed data and commands into the computer. Mouse is a small handheld device to control movement of a small symbol on the screen (pointer), and you make responses and commands by any selections from the screen. Microphone allows a user to speak into the computer to enter data (input sounds) and instructions.

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Ergonomic Computer Keyboards To minimize muscle strain and a host of related problems. An ergonomic keyboard is designed to make typing easier and lessen the strain that your hands may suffer, such as "Carpal Tunnel Syndrome".

Rollup Keyboards Typically the material is either silicone or polyurethane. These devices are meant to be rolled up, rather than folded, as folding can damage the circuitry.

OTHER TYPES???

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Scanner converts printed material (such as text and pictures) into a digital form the computer can use. Digital Camera you take pictures and then transfer the photographed images to the computer or printer instead of storing the images on a traditional film. PC Video Camera is a digital video camera that allows users to create movie or take still photographs electronically.

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Output Devices is any hardware component that conveys information to one, or more people. They enable you to send processed data out of your computer. This can take the form of text, pictures (graphics), sounds (audio), and video. Three commonly used output devices : 1. Printer 2. Monitor (display screen) 3. Speakers

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Printer produces text and graphics on a physical medium such as paper. Monitor displays text, graphics, and videos on screen. Speakers allow you to hear music, voice and other audio (sounds).

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System Unit is a case that contains the central electronic components of the computer that are used to process data. The circuitry of the system unit usually is part of or is connected to a circuit board called the motherboard. Two main components on the motherboard: 1. Central Processing Unit (CPU) 2. Memory

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Central Processing Unit is the electronic component that interprets and carries out the basic instructions that operate the computer. It is sometime referred to as the brains of the computer because it can perform 3 billion tasks a second without error, making them extremely powerful components.

RAM (Random Access Memory) Electronic components that store instructions waiting to be executed and data needed by those instructions. RAM keeps data and instructions temporarily (Volatile Storage) . Its contents are erased when the computer is shut off. RAM can hold multiple programs simultaneously.

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Storage Devices records (writes) and/or retrieve (reads) items to and from storage media. Example of storage devices : 1. Floppy disk drive 2. USB flash drives 3. CD / DVD drives 4. Hard disks 5. Card reader / writer

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A computer keeps data, instructions, and information on storage media. Example of storage media : 1. Floppy disks 2. USB flash drives 3. Hard disks 4. CDs 5. DVDs 6. Memory cards

CD : Compact Disc DVD : Digital Versatile Disc USB : Universal Serial Bus

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Capacity is the number of bytes (characters) a storage medium can hold. Storage terms used by manufacturers to define the capacity of storage media.

Storage Term Approximate Number of Bytes

Byte (B) 1 byte (8 bit)

Kilobyte (KB) 1 thousand

Megabyte (MB) 1 million

Gigabyte (GB) 1 billion

Terabyte (TB) 1 trillion

Example : A reasonably priced USB flash drive can store up to 256 MB of data (approximately 256 million bytes)

A typical hard disk has 160 GB (approximately 160 billion bytes) of storage capacity.

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Communication occur over transmission media. Transmission media such as satellites, cellular radio networks, are wireless, which means they have no physical lines or wires. Other non-wireless transmission media are cables and telephone lines.

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Communication Devices is a hardware component that enables a computer to send (transmit) and receive data, instructions and information to and from one or more computers. A widely used communication device is modem. Modem enables the computer to access other computers and the Internet via telephone lines, cables. Most inside in the system unit.

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Supercomputers

Mainframe computers

Minicomputers

Microcomputers

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Supercomputers is the ultrafast, most powerful computer and the most expensive. The fastest supercomputers are capable of processing more than 100 trillion instructions in a single second. Can be a single computer or a series of computers working in a parallel as a single computer. Stored in special, secure rooms. Different between mainframe is a supercomputer focuses on performing a few set of instruction as fast as possible, whereas a mainframe executes many instructions concurrently Example : 1. Weather forecasting 2. Nuclear energy research

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Mainframe computer is a large , expensive , powerful computer that can handle hundreds or thousands of clients at the same time. Mainframes store huge amounts of data, instructions, and information. Large corporations or government agencies that handle a high volume of data. For example, an airline use mainframe to handle airline reservations, banks manage customer accounts. Usually stored in a special secure rooms that have a control climate.

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Minicomputers/midrange servers is a centralized computer that served from a handful to several hundred "dumb" terminals. Minicomputer is size of one or several four drawer file cabinets with hardware and software. Handle the computing needs of 4 to approximately 200 client computer in a smaller organization.

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Microcomputers is computer with a microprocessor as its central processing unit. They are physically small compared to mainframe and minicomputers Four types of microcomputer : 1. Desktop computer 2. Notebook or laptop 3. Tablet PC 4. Handheld

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Desktop computer is designed so the system unit, input devices, output devices and any other devices fit entirely on or under a desk or table. In some models, the monitor sits on top of the system unit, which is placed on the desk. The more popular style of system unit is the tall and narrow tower, which can sit on the floor vertically.

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Laptop is a portable, personal computer designed to fit on your lap. Laptop computers are thin and lightweight, yet can be as powerful as the average desktop computer. On a typical notebook computer, the keyboard is on top of the system unit, and the display attaches to the system unit with hinges (joint). Most laptop computers can operate on batteries or a power supply or both.

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Netbook can perform the majority of the functions of a desktop or laptop, but is extremely mobile, miniature laptops, with screens rarely exceeding 10 or 12 inches. Primarily mobile Web browsing tools. They do not have some of the functionalities offered by a desktop or laptop. Tablet are equipped with sensors, including cameras, microphone, touch screen with finger or stylus gestures replacing computer mouse and keyboard

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Handheld computer / ultra personal computer (uPC) / handtop computer is a computer small enough to fit in one hand. The screens on handheld computers are small. Industry-specific handheld computers serve mobile employees : 1. Parcel delivery people 2. Whose jobs require them to

move from place to place