Discovering Computers Chapter 1 Overview On-line materials http://www.scsite.com/dc2011cp Ch 1 – Overview Ch 4 Processor Ch 2 – Internet & WWW Control Control Unit Unit Ch 3 – Application Software Input Devices Ch 5 Ch 8 – System Software Arithmetic Arithmetic Logic (ALU) Logic Unit Unit (ALU) Instructions Data Information MemoryInformation Output Data Devices Ch 6 Instructions Data Information Storage Devices Ch 7 2 What Is a Computer? Electronic device operating under the control of instructions stored in its own memory Accepts data Raw facts, figures, and symbols Processes data into information Data that is organized, meaningful, and useful Produces and stores results Stores for further use Communicates to other users and computers What are data and information? Data Raw facts, figures, and symbols Information Data that is organized, meaningful, and useful 4 Information processing cycle Process Input Output Communication Storage 5 What is hardware? Hardware electric, electronic and mechanical components 6 Hardware 7 Computer hardware includes: Input devices Output devices Processing hardware (System unit) Storage devices (magnetic, optical, electronic) Media devices Communication (network) devices 8 9 What is an input device? Hardware used to enter data and instructions PC camera microphone keyboard mouse scanner 10 digital camera What is an output device? Hardware that conveys information to a user monitor speakers printer 11 What is storage? – Holds data, instructions, and information for future use Storage media Physical material on which data, instructions, and information are stored Storage device Records and retrieves items to and from a storage medium 12 What is the system unit? Processor Also called a Central Processing Unit (CPU) The electronic component that interprets and carries out the basic instructions that operate the computer Memory Consists of electronic components that store instructions waiting to be executed and data needed by those instructions What is communications hardware? Establishes a connection between two computers using a modem, cable, electric grid, telephone lines, wireless, and satellites modem 14 What are networks? Collections of computers and devices connected together via communication devices and transmission media 15 What is the Internet? Worldwide collection of networks that connects millions of businesses, government agencies, educational institutions, and individuals Networks and the Internet People use the Internet for a variety of reasons: Communicate Online Trading Entertain Research Download Music Shop Share Videos Bank and Invest Web Application A social networking Web site encourages members to share their interests, ideas, stories, photos, music, and videos with other users 18 What is the World Wide Web (WWW)? Billions of documents, called Web pages, linked together on computers throughout the world Web browser Web site Collection of related Web pages Web page Program used to access and view Web page Contains text, Search engine graphics, sound, or Program used to select video and links to Web pages according to a other Web pages criteria and evaluate them 19 What is software? Consists of a series of instructions that tells the computer what to do and how to do it Also called a program Software High-level language program (in C) swap int v[], int k){ int temp; temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; } Assembly language program (for 80x86) pusha mov ah,2Ah int 21h mov byte ptr Place,'0' cmp dh,9 ja M1 Machine code 000000 00000 00101 0001000010000000 000000 00100 00010 0001000000100000 21 What is software ( SW )? Programs that control the operations of the computer – System Software Programs that perform specific tasks for users – Application Software Installing is the process of setting up software to work with the computer 23 What are the categories of computers? Embedded Computers Mobile Computers and Mobile Devices Personal Computers (desktop, laptop, notebook, tablet ) Game Consoles Servers Mainframes Supercomputers What is an embedded computer? A special-purpose computer that functions as a component in a larger product Embedded Computers Consumer Electronics • Mobile and digital telephones • Digital televisions • Cameras • Video recorders • DVD players and recorders • Answering machines Home Automation Devices • Thermostats • Sprinkling systems • Security monitoring systems • Appliances • Lights Automobiles • Antilock brakes • Engine control modules • Airbag controller • Cruise control Process Controllers and Robotics • Remote monitoring systems • Power monitors • Machine controllers • Medical devices Computer Devices and Office Machines • • • • Keyboards Printers Faxes Copiers What is a handheld (mobile) computer? Small enough to fit in one hand Used by mobile employees such as meter readers and delivery people Mobile Computers and Mobile Devices Mobile Computer Personal computer you can carry from place to place Mobile Device Computing device small enough to hold in your hand Examples include Examples include notebook computers, laptop computers, Tablet PCs, netbooks smart phones, PDAs, handheld computers, portable media players, digital cameras 28 Mobile Computers and Mobile Devices iPad and iPhone by Apple PDA – personal digital assistant Tablet PC Smart phone 29 What are smart phones? A smart phone is an Internet-enabled telephone that usually provides PDA capabilities What is eBook? Amazon Kindle What is iPad? Who is he? A tablet PC What is a personal digital assistant (PDA)? Provides personal organizer functions Calendar Appointment book Address book Calculator Notepad What is a desktop computer? Designed so all of the components fit entirely on or under a desk or table What is a notebook computer? Portable, small enough to fit on your lap Also called a laptop computer What are game consoles? Mobile computing device designed for singleplayer or multiplayer video games Xbox-360, Sony play station, Nintendo, Wee Servers A server controls access to network resources and provides centralized storage Mainframes Mainframe Very powerful, expensive computer that supports thousands of connected users Supercomputers Supercomputer The fastest, most powerful, most expensive computer. Used for applications requiring complex mathematical calculations Computer system includes Hardware - the physical components of a computer Software – programs to perform specific tasks Computer architecture (outside view – what it does?) Computer organization (inside view – how it does?) What has to be added to get an Information System? 40 Elements of an Information System Hardware Software People Data Procedures 41 Who are users of computers? Home user SOHO user Mobile user Power user Enterprise user Computer Applications in Society Education Finance Government Health Care Computer Applications in Society Science Publishing Travel Manufacturing 44 Appreciating the Gift Crime fighting Tools for disabled Automation Transportation (efficiency and safety) Paperless technologies More efficient government Management of economy Fighting enemies Telecommuting 45 Appreciating the Gift News, research Distance education Online shopping listen to music Surfing WWW Watch movies Health management Bank and invest Entertainment games, leisure 46 Computers add complexity From natural to virtual More consumerism Public Safety Impact on Labor Force Weakening of local communal life Digital divide Internet addiction New kinds of crimes Easy brainwashing Advantages Disadvantages of Using Computers Speed Reliability Health Risks Violation of Privacy Consistency Public Safety Storage Impact on Labor Force Impact on Environment Communications 49 Green computing involves reducing the electricity consumed and environmental waste generated when using a computer 50 To see the online addition to the book click here