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Information technology Choi yiu Kuen Lecturers and Tutors Weeks 1 – 4, Choi yiu kuen, [email protected] , ext-27888639 Weeks 5 – 7, Bryan Cheung [email protected] , 27888115 Textbook using Information Technology by Williams and Sawyer, fifth edition, ISBN 0-07-115105-2 Assessment

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Information technology l.jpg

Information technology

Choi yiu Kuen


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Lecturers and Tutors

  • Weeks 1 – 4, Choi yiu kuen, [email protected], ext-27888639

  • Weeks 5 – 7, Bryan Cheung [email protected], 27888115

  • Textbook using Information Technology by Williams and Sawyer, fifth edition, ISBN 0-07-115105-2


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Assessment

  • Continuous Assessment

    • Laboratory practise (20%)

    • Assignment – hardcopy submission and presentation (25%)

  • Time-constraint examination

    • Questions (50%)



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Using Information Technology

Chapter 1 – Page 1 - 23

Introduction to Information Technology


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Introduction to Information TechnologyMind Tools for Your Future

  • 1.1 Infotech Becomes Commonplace: Cellphones, E-Mail, the Internet, & the E-World

  • 1.2 The “All-Purpose Machine”: The Varieties of Computers

  • 1.3 Understanding Your Computer: What If You Custom-Ordered Your Own PC?

  • 1.4 Where is Information Technology Headed?


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Say goodbye to the personal computing era. Just on the horizon is the era that comes next--the personal information era.” --Kevin Maney, Technology Journalist

  • Pervasive computing trends:

    • Information overload

    • Less use of our brains for memorizing

    • A surge in multi-tasking activity


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1.1 Infotech Becomes Commonplace: Cellphones, E-Mail, the Internet, & the E-World

  • Information technology (“infotech”):

  • Computers - programmable multiuse machines that convert data into information

  • Communications - electromagnetic devices and systems for communicating over long distances


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The Telephone Grows Up

  • Approximately 1 billion people using cellphones

  • Internet phones are cell phones plus:

    • Email

    • Web services

    • Video


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You’ve Got Mail!” E-Mail’s Mass Impact

  • E-mail (“electronic mail”) -

  • messages transmitted over a network

  • Network - communications system connecting two or more computers


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The Internet, the World Wide Web, & the “Plumbing of Cyberspace”

  • Cyberspace encompasses the whole wired and wireless world of communications:

  • The Internet - the “mother of all networks”

  • The World Wide Web - multimedia part of Net


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The E-World & Welcome to It

  • E-business

  • E-commerce

  • E-government

  • E-learning

  • E-pinions

  • E-tailing

e-service


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1.2 The “All-Purpose Machine”: The Varieties of ComputersAll Computers, Great & Small: The Categories of Machines

  • Supercomputers

  • Mainframes

  • Workstations

  • Microcomputers

  • Microcontrollers

IBM ASCI White


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All Computers, Great & Small: The Categories of Machines

  • Supercomputers

  • Mainframes

  • Workstations

  • Microcomputers

  • Microcontrollers

VP2400 mainframe


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All Computers, Great & Small: The Categories of Machines

  • Supercomputers

  • Mainframes

  • Workstations

  • Microcomputers

  • Microcontrollers

Sun Microsystems workstation


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All Computers, Great & Small: The Categories of Machines

  • Supercomputers

  • Mainframes

  • Workstations

  • Microcomputers

  • Microcontrollers

Sony tower PC


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All Computers, Great & Small: The Categories of Machines

  • Supercomputers

  • Mainframes

  • Workstations

  • Microcomputers

  • Microcontrollers

Picture of desktop


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All Computers, Great & Small: The Categories of Machines

  • Supercomputers

  • Mainframes

  • Workstations

  • Microcomputers

  • Microcontrollers

Laptop computer


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All Computers, Great & Small: The Categories of Machines

  • Supercomputers

  • Mainframes

  • Workstations

  • Microcomputers

  • Microcontrollers

Personal Digital Assistant


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All Computers, Great & Small: The Categories of Machines

  • Supercomputers

  • Mainframes

  • Workstations

  • Microcomputers

  • Microcontrollers


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Servers and clients

  • Server – it is a central computer that holds collections of data & programs for clients

  • Clients - PCs, workstations, & other devices

  • Server + Clients linked together = Client/Server network


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Data is defined as:

The raw facts and figures that are processed into information

Information is defined as:

Data that has been summarized or otherwise manipulated for use in decision making

1.3 Understanding Your Computer: What If You Custom-Ordered Your Own PC?How Computers Work - Concept #1The purpose of a computer is to process data into information.


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Hardware is:

All the machinery and equipment in a computer system, You could physically see and touch,

Software is:

All the instructions that tell the computer how to perform a task, you could not physically see and touch.

How Computers Work - Concept #2Computers consist of hardware and software.


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How Computers Work - Concept #3All computers follow the same five basic operations.

  • Input – keyboard & mouse

  • Processing

  • Storage

  • Output

  • Communications

Keyboard

Mouse


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Case or system cabinet


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Processor chip, CPU


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Memory chips, 64M, 128M and 256M


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Motherboard


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Input

Processing

Storage

Output

Communications

Primary storage (memory)

Computer circuitry that temporarily holds data waiting to be processed

Secondary storage (storage)

The area in the computer where data or information is held permanently

How Computers Work - Concept #3All computers follow the same four basic operations


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Input

Processing

Storage

Output

Communications

Byte - 1 character of data

Kilobyte - 1000 characters

Megabyte - 1,000,000 characters

Gigabyte - 1 billion characters

Terabyte - 1 trillion characters

How Computers Work - Concept #3All computers follow the same four basic operations


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Floppy disk

Zip disk


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Hard-disk drive


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Sound card


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Speakers


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Video card


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Monitor


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Printer


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How Computers Work - Concept #3All computers follow the same four basic operations

  • Input

  • Processing

  • Storage

  • Output

  • Communications

Modem



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You still need the software!

Bill Gate

  • System software

  • Helps the computer perform essential operating tasks and enables the application software to run, such as Windows XP, 2000 and 98, Linux

  • and…


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You still need the software!

  • Application software

  • Enables you to perform specific tasks--solve problems, perform work, or entertain yourself such as word, excel, powerpoint, photoshop


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1.4 Where Is Information Technology Headed?Three Directions of Computer Development

  • Miniaturization

    • smaller

  • Speed

    • faster

  • Affordability

    • cheaper

Then (1946)

Now


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Three Directions of Communications Development

  • Connectivity–connects to other machines

  • Interactivity– two-way communication, a user can respond to information

  • Multimedia – supports text, graphics, video and sound

Auto PC


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When Computers & Communications Combine:Convergence, Portability, & Personalization

  • Convergence –means combining industries through various devices that exchange data in the format used by electronics, entertainment and mass media.

  • Portability –it is so tiny that you could carry

  • Personalization –creation of information tailored to individual


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E” Also Stands for Ethics

  • Speed and scale – huge information can be stored and retrieved.

  • Unpredictability – compared to others, such as electricity, it is less predictable

  • Complexity – computer systems are complex


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Summary

  • Data and Information

  • Hardware and Software

  • Computer Scale: supercomputer, mainframe, minicomputer, microcomputer, microcontroller

  • Microcomputer: Input, Output, CPU, memory, hard disk

  • Software: Operation software (Windows XP) and application software (Word)


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