Transcript Document
Lecture 1-
PC, Client Server, Future IT These materials are from
0-07-115105-2”
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Textbook using Information Technology by Williams and Sawyer, fifth edition, ISBN
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Introduction to Information Technology Information technology becomes popular, as There are many cellphones, E-Mail, the Internet, & the E-World in our lives.
The “All-Purpose Machine”: The Varieties of Computers. A computer can access the Internet, play games, buy software over the internet, send and receive e-mails. Understanding Your Computer: What If You Custom-Ordered Your Own PC?
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 (common) computing trends : Information overload Less use of our brains for memorizing A surge in multi-tasking activity 2020/4/29
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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 mobile phone Grows Up
Approximately 1 billion people using cellphones Internet phones are cell phones plus: Email Web services Video 2020/4/29
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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 2020/4/29
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The Internet, the World Wide Web, & the
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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 2020/4/29
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The E-World & Welcome to It E-business E-commerce E-government E-learning E-pinions (opinion) E-tailing (retailing) 2020/4/29
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1.2 The “ All-Purpose Machine ” : The Varieties of Computers All Computers, Great & Small: The Categories of Machines l Supercomputers 1. Mainframes 2. Workstations 3. Microcomputers 4. Microcontrollers IBM ASCI White 2020/4/29
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All Computers, Great & Small: The Categories of Machines l Supercomputers 1. Mainframes 2. Workstations 3. Microcomputers 4. Microcontrollers VP2400 mainframe 2020/4/29
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All Computers, Great & Small: The Categories of Machines l Supercomputers 1. Mainframes 2. Workstations 3. Microcomputers 4. Microcontrollers Sony tower PC 2020/4/29
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All Computers, Great & Small: The Categories of Machines l Supercomputers 1. Mainframes 2. Workstations 3. Microcomputers 4.
Microcontrollers 2020/4/29
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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 and Clients linked together. It is called Client/Server network such as the Internet. (don ’ t miss “ the ” ) 2020/4/29
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Client, server and Internet Service Provider (ISP) such as i-cable Regional service P rovider Browser server ISP ISP
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1.3 Understanding Your Computer: What If You Custom-Ordered Your Own PC?
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
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How Computers Work - Concept #2 Computers consist of hardware and software.
Hardware is: Software is: l All the machinery and equipment in a computer system, You could physically see and touch, All the instructions that tell the computer how to perform a task, you could not physically see and touch.
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How Computers Work - Concept #3 All computers follow the same five basic operations.
1.
2.
3.
4.
5.
Input – keyboard & mouse Processing Storage Output Communications Mouse Keyboard 2020/4/29
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How Computers Work - Concept #3 All computers follow the same four basic operations 1.
Input 2.
Processing 3.
Storage 4.
Output 5.
Communications Motherboard 2020/4/29
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How Computers Work - Concept #3 All computers follow the same four basic operations 1.
Input 2.
Processing 3.
Storage 4.
Output 5.
Communications 2020/4/29
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How Computers Work - Concept #3 All computers follow the same four basic operations 1.
Input 2.
Processing 3.
Storage 4.
Output 5.
Communications Video card 2020/4/29
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How Computers Work - Concept #3 All computers follow the same four basic operations 1.
Input 2.
Processing 3.
Storage 4.
Output 5.
Communications Modem 2020/4/29
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Put all the hardware together and … 2020/4/29
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You still need the software!
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 … 2020/4/29
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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 2020/4/29
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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 2020/4/29
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When Computers & Communications Combine: Convergence, Portability, & Personalization Convergence mass media. – means combining industries through various devices that exchange data in the format used by electronics, entertainment and Portability – that you could carry it is so tiny Personalization creation of information tailored to individual – 2020/4/29
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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) 2020/4/29
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