The document provides an overview of various topics related to computer science including instant messaging, voice over internet protocol (VoIP), weblogs, podcasts, webcasts, wikis, social networking, web entertainment, e-commerce, online annoyances like spam and spyware, web browsers, search engines, the origins and differences between the internet and the web, internet connection options, software types including system software and various application software, and operating systems.

1. Computer Science 203 102 Review Slides For Final Exam

2. Instant Messaging Real-time text-based conversations Set up a list of contacts Buddy list Contacts must be online IM software detects presence Example: AOL Instant Messenger

3. Voice over Internet Protocol VoIP - The Internet as a means to place phone calls Uses technology similar to e-mail to send voice data digitally Requires a microphone an Internet connection A VoIP provider Services differ Free services require an account on both ends Paid services connect phone to computer Cable and DSL providers offer phone through broadband WiFi IP phones call through Internet hotspots and wireless networks

4. Weblogs (blogs) Known as blogs Available to the public Simple to create, read, and manage Entries listed on a single page Most recent entry at the top Searchable Some are personal Many are focused on a topic

5. Podcasts Video blog (vlog) – entries are video clips Podcasts – compressed audio/video files distributed on the Internet RSS (Really Simple Syndication) technology allows constant updates for subscribers Podcasts are all over the Web Requires “aggregator” software to gather podcasts Requires media player software to play them Simple to create and attach RSS files

6. Webcasts and Wikis Webcasts broadcast audio/visual files but are not updated use streaming media A wiki is a Web site that allows anyone to change its content Wikis provide an excellent source for collaborative writing Unlike blogs, wikis can be edited for a “common” opinion

7. Social Networking Social networking sites like Facebook.com Members share common interests Members communicate by voice, chat, instant message, video, and blogs Members create personalized profiles Growth has been explosive Risks must be recognized and reduced

8. Web Entertainment Multimedia: Involves forms of media and text Graphics Audio Video Streaming audio and video Plug-in

9. Conducting Business Over the Internet E-Commerce: Electronic commerce Business-to-consumer (B2C) Business-to-business (B2B) Consumer-to-consumer (C2C) Secure transactions B2B E-commerce Manufacturer Suppliers Retailer

10. Online Annoyances Spam – electronic junk mail Pop-ups – intrusive advertising Cookies – tracking user’s browsing habits Spyware – programs that collect data from a user’s computer Malware - software that has a malicious intent Phishing and Hoaxes – Ruses to fool and maybe steal from users

11. Phishing and Hoaxes Phishing is a phony communication Attempts to scam someone into sending vital information Hoaxes are attempts to scam people into sending money, or join a chain letter Identity Theft

12. Navigating the Web: Web Browsers Computer software Graphical Enables Web navigation Popular browsers: Internet Explorer Netscape Navigator Camino (Mac OSX)

13. Browser Toolbars

14. Hyperlinks Provide access to other Web pages Specially coded text or graphics Cursor becomes a hand with finger pointing upward

15. Favorites and Bookmarks List created of favorite Web pages Easy method of returning to Web pages Internet Explorer uses Favorites Netscape uses Bookmarks Live Bookmarks use RSS

16. Tabbed Browsing Found on Firefox and Safari browsers Not available on Internet Explorer Multiple pages in same browser window

17. Search Engines User keys word or phrase in search box “ Spider” or “Robot” or “Crawler” program scans Web pages Results are indexed and sent to the client

18. Evaluating Web Sites Who is the author of the article or Web site sponsor? What audience is the site geared toward? Is the site biased? Is the information current? Are links available?

19. The Internet: The Basics Origin of the Internet The Internet vs. the Web Clients and servers Connecting to the Internet

20. Comparing Internet Connection Options 500 Kbps 100 Kbps Satellite 4 Mbps 500 Kbps Cable 1.5 Mbps 1.5 Mbps DSL (SDSL) 1 Mbps 300 Kbps DSL (ADSL) 56 Kbps 56 Kbps Dial-Up Maximum Download Data Transfer Rate (approximate) Maximum Upload Data Transfer Rate (approximate) Connection Option

21. The Origin of the Internet ARPANET: Advanced Research Projects Agency Network Funded by the U.S. government in the 1960s Allowed computers at leading universities and research organizations to communicate with each other over great distances

22. The Web The Web is a part of the Internet distinguished by: common communication protocols TCP/IP and HTML special links (called hyperlinks ) Web invented in 1989 by Tim Berners-Lee 1993, National Center for Supercomputing Applications releases the Mosaic browser Developers of Mosaic release Netscape (1994) Netscape is beginning of Web’s major growth

23. The Internet vs. The Web Internet – part of the system that is primarily hardware infrastructure (telecommunications, routers, servers, disk drives, etcetera) Web – part of the system that contains intellectual property in many multimedia formats (test files, graphic files, sound files, video files, etc.) INTERNET WWW

24. Future of the Internet Large Scale Networking (LSN): Research and development of cutting-edge networking and wireless technologies Internet2: Project sponsored by universities, government, and industry to develop new Internet technologies Internet2 backbone supports transmission speeds of 9.6 Gbps

25. Software A set of instructions that tells the computer what to do Two main types of software System software Application software System Software Application Software

26. System Software vs. Application Software System Software Coordinates instructions between software and hardware Includes Operating system Utility programs Application Software Programs used to complete tasks Includes Productivity software Specialty software Entertainment software Educational and reference Software Personal software

27. Productivity Software Word processing programs Spreadsheet programs Presentation programs Database programs Personal information manager programs Programs that enable you to perform tasks required in home, school, and business

28. Used to create and edit written documents Features include Quick and easy editing Variety of formatting options Graphics Templates Examples Corel WordPerfect Microsoft Word Word Processing Software Sammy the WonderDog Word Processor Features Click to view Insert Graphics Create Tables Insert Excel Spreadsheets Use Templates

29. Spreadsheet Software Used to perform calculations and numerical analyses Features include Worksheets with cells Values, formulas, and functions Automatic recalculation Examples Lotus 1-2-3 Microsoft Excel Spreadsheet Features Click to view Charts Formulas Functions Labels Values Columns Rows Cell Range of cells Worksheet

30. Presentation Software Used to create slide shows Features include Templates and layouts Different views Examples Corel Presentations Microsoft PowerPoint Presentation Software Features Click to view Slide Show View Background Bulleted Text Graphics Slide Title Speaker Notes Work Area Task Pane Slide/Outline View

31. Database Software Used as a complex electronic filing system Features include Ability to group, sort, and retrieve data and generate reports Organized into fields, records, and tables Examples Corel Paradox Microsoft Access Productivity Software Tools Wizards Step-by-step guides to help you complete a task

32. Productivity Software Tools Templates redesigned forms included with software

33. Graphics and Multimedia Software Used to create and design documents, images, illustrations, Web pages, and more

34. Image-Editing Software Used to edit photographs and other images Also called photo-editing software Features include Tools for basic modifications to digital images Painting tools that allow you to create images Example: Adobe Photoshop Photo Collection software Google “Picasa” Microsoft “Photo Story”

35. Digital Audio Software MP3: Audio compression format Software allows you to record, rip, and burn files Also allows you to perform format conversion

36. Video-Editing Software Used to edit digital videos Features include Special effects Transitions Narration/voiceover Overlays Examples Adobe Premiere Microsoft Movie Maker

37. Entertainment Software Designed to provide users with entertainment Categories include Action and Adventure Driving Puzzles and strategy Role-playing Card-playing Simulation Virtual reality

38. Educational and Reference Software Educational Software Provides instruction or training Types include K-12 education Skills Test preparation Course management Reference Software Sources of reference Types include Atlases, dictionaries, thesauri, encyclopedias Medical and legal references

39. Drawing Software Used to create and edit Two-dimensional drawings Technical diagrams Animations Geometric shapes Also referred to as illustration software Examples Adobe Illustrator Microsoft Visio Bit-mapped programs MS-Paint

40. Desktop Publishing Software Used to arrange text and graphics for publications Features include Text formatting File importing Graphics tools Web publishing Example: QuarkXPress

41. Web Page Authoring Software Used to design Web pages: knowing HTML is not necessary Features include Wizards and templates Reference materials Example Macromedia Dreamweaver Office Applications HTML authoring capabilities

42. System Software Operating systems Control computer functions: Hardware Memory Application programs System maintenance Provide user interface System utilities Programs that perform computer housekeeping tasks: Manage system resources Improve efficiency Virus prevention

43. Single-User Operating Systems Single-task systems Perform one task at a time PDAs: Pocket PC Palm OS Windows Mobile MS-DOS Multitask systems Perform simultaneous tasks Windows MAC OS Linux

44. Multiuser Operating Systems Known as network operating systems Allow access to the computer system by more than one user Manage user requests Systems include: UNIX Novell Netware Windows Server 2003

45. Desktop Operating Systems Operating system combined with the processor is known as a platform Microsoft Windows / Intel Apple Macintosh / Motorola Desktop operating systems include: Microsoft Windows MAC OS UNIX Linux

46. What the Operating System Does Provides user interface Manages the CPU Manages memory Manages hardware Coordinates application software with the CPU

47. The User Interface Enables you to interact with the computer Types of interfaces: Command-driven interface Menu-driven interface Graphical user interface Command-driven Menu-driven Graphical

48. Starting the Computer The Boot Process Step 1: The basic input/output system (BIOS) is activated Step 2: A Power-on self-test (POST) checks attached hardware Step 3: The operating system loads into memory Step 4: Configuration and customization settings are checked 1 2 3 4

49. Handling Errors in the Boot Process Non-system disk or disk error Remove the floppy from the drive and press any key POST errors Single beep: Everything is loading properly Series of beeps: Hardware problem Safe mode Windows does not boot properly Uninstall any new devices or software

50. File Management The operating system provides an organizational structure to the computer’s contents Hierarchical structure of directories: Drives Folders Subfolders Files

51. Viewing and Sorting Files and Folders Windows Explorer Tiles View

52. Viewing and Sorting Files and Folders Windows Explorer Icon view

53. Viewing and Sorting Files and Folders Windows Explorer List View

54. Viewing and Sorting Files and Folders Windows Explorer Detail View Sorted and grouped

55. Naming Files Filename: Name assigned plus filename extension only characters not legal in filenames are: \ ⁄ : * ? &quot; < > ¦ all others are allowed Bioreport .doc or Bio report .doc

56. Filename Extensions Filename extensions: Used by programs Application Type of Document Extension Hypertext Markup Language Web page .htm or .html Adobe Acrobat Portable Document Format .pdf WinZip Compressed file .zip Windows Bitmap image .bmp Microsoft Access Database .mdb Microsoft PowerPoint PowerPoint presentation .ppt Microsoft Excel Workbook .xls Microsoft Word; Corel WordPerfect Word processing document .doc

57. File path File path Location of the file C: Tech in Action\TIA Pics\ \My Documents\ dotmatrix.gif Drive Primary folder Secondary folders Filename

58. Add or Remove Programs Installation wizard Uninstall wizard: Do not delete programs

59. File Compression Programs Reduce the size of a file: Removes redundancies

60. Evaluating the CPU How does the CPU work? Control unit Arithmetic logic unit (ALU) Machine cycle: Instruction Cycle Fetch Decode Execution Cycle Execute Store Speed: MHz GHz

61. How Much Ram is Needed? RAM for System Software RAM for Productivity Software RAM for Entertainment RAM for Graphics Programs 128 MB MS Picture It! Graphics 64 MB Windows Media Player Entertainment Software 128 MB MS Office Pro Productivity Software 128 MB Windows XP System Software

62. Evaluating Storage Types of storage devices: Hard drive Floppy drive Zip disk drive CD/DVD Flash memory Nonvolatile storage

63. The Hard Disk Drive Storage capacity up to 500 GB Access time is measured in milliseconds Data transfer rate is measured in megabits or megabytes per second Spindle speed is measured in revolutions per minute (rpm)

64. How a Hard Disk Works Composed of several coated platters stacked on a spindle Data saved to the disk: pattern of magnetized spots – Spots = 1 – Spaces = 0 Between platters are read/write heads that read and write magnetized data Spots are translated into data Platters Read/write head Access arms

65. Portable Storage Gives us the ability to move data from one computer to another Types of portable storage devices: Floppy disk: Capacity 1.44 MB Zip disk: Capacity 100 MB to 750 MB CD-R, CD-RW, DVD-R, DVD-RW: Capacity 700 MB to 9.4 GB Flash drive: Capacity 32 MB to 1 GB Flash memory Card: Up to 4 GB

66. Optical Storage Optical media: CD-ROM CD-R CD-RW DVD-ROM DVD-R DVD-RW Laser Pits scatter laser light equaling a 1 Nonpitted area reflects laser light equaling a 0

67. Video Cards Process binary data into images Contain memory known as video RAM (VRAM) Control the number of colors a monitor can display (bit depth) Standard VGA 4 bits 16 colors True color (SVGA) 24 bits 16 million colors

68. Monitors Things to consider: Types: CRT or LCD Size: 15, 17, 19, or 21 inch Resolution: Increasing resolution allows more to be displayed Dot pitch: .31mm or less Refresh rate: 75 Hz or higher

69. Evaluating Ports Ports are used to connect peripheral devices to the computer Things to consider: Devices you want to use Ports needed for the devices

70. Types of Ports Serial Port Transfers data one bit at a time; 56Kbps PS/2 Port COM 1 Port PS/2 Connectors Serial Connector

71. Types of Ports Parallel Transfers eight bits of data simultaneously; 12 Mbps LPT 1 Port Printer Cable Connector

72. Types of Ports Universal serial bus Transfer speed up to 480 Mbps; hot swapping USB Port USB Connector

73. Types of Ports FireWire Transfer rate of 400 Mbps; Digital cameras Newer FireWire 800 is fastest Available only on the Apple Mac FireWire Port FireWire Connector

74. Types of Ports Ethernet Transfer rate of 100 Mbps; connects computers to networks Ethernet Port Ethernet jack

75. Types of Ports IrDA Transfer rate of 4 Mbps; Uses infrared light waves IrDA

76. Types of Ports Bluetooth Transfer rate of 1 Mbps; radio waves send data over short distances Bluetooth

77. Mobile Computing Devices Pagers Cellular phones Portable media players Personal digital assistants Tablet PCs Laptop computers

78. Cell Phone Hardware Microprocessor (CPU): Coordinates data between components Runs the operating system Memory: ROM stores the operating system Internal memory chips store: Contact data Ring tones Images Small application programs Microprocessor Memory

79. Cell Phone Hardware Input devices: Microphone Keypad Graffiti pad Touch-screen Digital camera Output devices: Speaker LCD display Microphone Keypad LCD display Speaker

80. Cell Phone Internet Connectivity Wireless Internet service provider Maximum speeds of 200 to 300 Kbps Micro-browser software EDGE and EVDO standards Difficult to display Web pages on small screen Checking e-mail is a popular feature Special “push” technology delivers e-mail to a cell phone

81. Portable Media Players MP3: Format for storing music Portable media player (PMP): A small device that stores and plays music Storage space determines the number of songs stored: Memory chips 64 MB to 256 MB Hard drive up to 40 GB Sampling rate also affects number of songs stored

82. PMP Ethical Issues Is it illegal to download MP3 files? MP3.com: Song files are on a public server Permission is given by the artist or recording company to place the files on the server A fee is paid to download a file. Napster: A file exchange site Song files were borrowed from users’ computers (peer-to-peer [P2P] sharing) Sued for copyright infringement

83. Podcasting Distributing nonmusic MP3 files over the Internet Podcasts can be information, books on tape audio plays, etc. People can listen when they wish iPod synchronization transfers new content.

84. Small devices that store digital information Known as palm computers or handhelds PDA hardware includes: CPU Operating system Storage capabilities Input/output devices Ports Personal Digital Assistants (PDAs)

85. PDA Input and Output Devices Input devices Touch-screen with stylus Keyboards: On-screen Integrated Folding Digital cameras Output devices LCD displays: Grayscale Color

86. Notebook Ports A full set of ports: Parallel Monitor USB Modem Ethernet Audio jacks FireWire PCI type I/II card slots DVI IrDA

87. Binary Language Computers work in binary language Consists of two numbers: 0 and 1 Everything a computer does is broken down into a series of 0s and 1s Switches: Devices inside the computer that can be flipped between these two states: 1 or 0, on or off

88. Switches Nonmechanical devices in computers that open and close circuits Types of electrical switches: Vacuum tubes Transistors: Semiconductors Integrated circuits Vacuum Tube Transistors Integrated Circuits

89. The on/off state of a switch represents one bit of data Bit (binary digit) On = 1 Off = 0 Switches Representing Data 0 1 OR = 1 bit OFF 0 ON 1

90. The Binary Number System Describes a number as powers of 2 Also referred to as base 2 numbering system Used to represent every piece of data stored in a computer: all of the numbers, letters, and instructions

91. The Binary Number System Number systems are organized ways to represent numbers Each number in one system has a corresponding number in another. 01011001 = 89 Binary Base 10 89 1 = 0 + 0 + 8 + 16 + 0 + 64 + 0 + Base 10 1 0 0 1 1 0 1 0 Binary 1 2 2x1 4 2x2 8 2x4 16 2x8 32 2x16 64 2x32 128 2x64

92. Representing Letters and Symbols American Standard Code for Information Interchange (ASCII) 8 bits = 1 byte = alphanumeric character or symbol 256 different combinations Unicode 16 bits equal 1 byte 65,000 different combinations, used for all languages 01100001 = a 01000001 = A 00100011 = # 01101101 = m ASCII

93. The CPU: Processing Digital Information The CPU is the brains of the computer Different types of CPUs Intel and AMD chips: Used in most Windows-based PCs Apple systems use different CPU design Differentiating CPUs Processing power Clock speed and cache

94. The System Clock Located on the motherboard Controls the CPU’s processing cycles Clock cycle Pulse or tick Clock speed Number of pulses per second Measured in hertz (Hz)

95. The Control Unit Manages the switches inside the CPU Is programmed by CPU designers to remember the sequence of processing stages for that CPU Moves each switch to its correct setting (on or off) Then performs the work of that stage

96. The Arithmetic Logic Unit (ALU) Part of the CPU designed to perform mathematical operations (addition, subtraction, multiplication, division, etc.) Also performs logical OR, AND, and NOT operations Is fed data from the CPU registers Word size: Number of bits a computer can work with at a time

97. Cache Memory Small amount of memory located on the CPU chip or near it Stores recent or frequently used instructions and data Used for quick access by the CPU Different levels of cache

98. RAM: The Next Level of Temporary Storage Volatile: When you turn off your computer, the data is erased Several kinds of RAM exist Each type of RAM has a different design Some types work at much faster speeds Some transfer data more quickly

99. Bus Electrical pathway used to move data between components Local bus: Connects the CPU with the memory Expansion bus: Connects the CPU with peripheral devices Buses: The CPU’s Data Highway 01100010 01110011 01001000 00100111

100. Bus Performance Bus clock speed Rate of speed data moves from one location to another Measured in MHz (millions of clock cycles per second) Bus width The number of bits of data moved on a bus at any one time Measured in bits 16 bits 32 bits

101. Moore’s Law Number of transistors on a CPU will double every 18 months First chip had 29,000 transistors Pentium chip 169,000,000 transistors Moore’s Law has been accurate for more than 40 years Law has remained accurate into the 21st century

102. Making Computers Faster Dual processing Two CPUs on the same system Each processor shares the workload Parallel processing Network of computers Each computer works on a portion of the problem simultaneously Dual processors