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CHAPTER 2

CHAPTER 2. Input & Output Prepared by: Mrs . sara salih. What Is an Information System?. System: Collection of elements and procedures that interact to accomplish a goal. Football game, transit systems, etc. Information system: A collection of elements that interact

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CHAPTER 2

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  1. CHAPTER 2 Input & Output Prepared by: Mrs .sarasalih

  2. What Is an Information System? System: Collection of elements and procedures that interact to accomplish a goal. Football game, transit systems, etc. Information system: A collection of elements that interact to generate the information neededin an organization

  3. Input Devices 1- Keyboard 2- Pointing Devices 3- Mouse 4- Electronic pen 5-Touch screen 6-Scanners 7-Digital cameras

  4. Keyboards Keyboard: An input device containing keys, arranged in a typewriter configuration, used to input letters, numbers, and other symbols * Can be wired or wireless Contains: - Standard alphanumeric keys - Numeric keypad - Function keys - Directional keys and special keys

  5. Keyboards

  6. Keyboards * Keyboards are increasingly including alternate input tools: - Touch pads - Some also include built-in display screens

  7. Pointing Devices # Pointing device: An input device that moves an onscreen pointer (arrow or insertion point) to allow the user to select objects on the screen. Common types of pointing devices: - Mouse - Electronic pen - Touch screen

  8. The Mouse Mouse: A pointing device the user slides along a flat surface to move a pointer around the screen and clicks its buttons to make selections

  9. The Electronic Pen # Electronic pen: Device used to select objects, as well as to draw or write electronically on the screen Also called tablet pen, digital pen.

  10. Touch Screens # Touch screen: Display device that is touched with the finger to issue commands or otherwise generate input to the connected PC Used with: Desktop and portable PCs Mobile phones

  11. Touch Screens

  12. Scanners # Scanner (optical scanner): Input device that reads printed text and graphics and transfers them to a computer in digital form

  13. Digital Cameras # Digital cameras: Record images on digital storage medium rather than film - Can either be still cameras or video cameras - Typically use flash memory for storage Types: - Digital still cameras - Digital video cameras

  14. Digital Cameras

  15. Audio Input Audio input: The process of entering audio data into the computer - Voice - Music (from CDs) Voice input systems (speech recognition systems) - Enable a computer to recognize the human voice

  16. Voice Input Systems

  17. Output Devices • Display devices ( screen). • Flat-Panel Display Technologies. • Data and Multimedia Projectors. • Printers. • Audio output ( headphones , speakers,)

  18. Output Devices (cont ..) *Display device: Presents output visually - Monitor: Display device for a desktop PC - Display screen: Screen built into a variety of devices - handheld PCs, - Mobile phones and mobile devices - E-paper

  19. Display Devices

  20. Flat-Panel Display Technologies # Liquid crystal displays (LCDs): Use charged liquid crystals between sheets of glass or plastic # LED (Light emitting diode): Used in displays as well as a variety of consumer products # Organic light emitting diode (OLED) displays: Use emissive organic material to display brighter and sharper images

  21. Flat-Panel Display Technologies

  22. Data and Multimedia Projectors Data projector: Display device that projects all computer output to a wall or projection screen - Most data projectors today can project video, in addition to computer output - Can be wireless or integrated into devices

  23. Printers Printers: Produce hard copy Printer Characteristics: - Color vs. black and white - Personal vs. network printers - Print resolution - Print speed - Multifunction capabilities

  24. Printers

  25. Types of printers - Laser Printers - Ink-Jet Printers - Special-Purpose Printers

  26. Audio Output Audio output: Output in the form of voice or music - Speakers - Headphones and headsets - Earphones

  27. The Operating System Operating system: A collection of programs that manage and coordinate the activities taking place within a computer system Examples: Most PCs today run Windows, Mac OS, or Linux , Windows Vista ,Windows 7

  28. Functions of an Operating System * Interfacing with users (typically via a GUI) * Booting the computer * Managing resources and jobs * File management * Security

  29. Differences Among Operating Systems * Command line vs. graphical user interface (GUI) - Most operating systems use GUI today

  30. Differences Among Operating Systems • Personal vs. server operating system • Personal operating system: designed to be installed on a single PC • Server operating system: designed to be installed on a network server • Client PCs still use a personal operating system • Server operating system controls access to network resources Many operating systems come in both versions

  31. Utility Programs * Utility program: Type of software that performs a specific task, usually related to managing or maintaining the computer system

  32. Summary Definitions of System & Information systems. Types of Input devices Types of Output devices Operating Systems Utility Programs

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