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Chapter 5

Chapter 5 Input and Output: The User Connection Input vs. Output Users use input devices to provide data to the computer Output devices provide information to the user Input devices Keyboard Function keys Main keyboard Shift, control, Caps lock, tab Numeric keys and status lights

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Chapter 5

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  1. Chapter 5 Input and Output: The User Connection

  2. Input vs. Output • Users use input devices to provide data to the computer • Output devices provide information to the user

  3. Input devices • Keyboard • Function keys • Main keyboard • Shift, control, Caps lock, tab • Numeric keys and status lights • Num lock • Num lock, Insert, and Caps lock are “toggle” keys

  4. Input Devices–Pointing Device • Pointer • Arrow • Insertion point or cursor • Vertical bar

  5. Input Devices–Pointing Device • Mouse • Mechanical mouse • Optical mouse • Wireless mouse

  6. Input Devices–Pointing Device • Trackball

  7. Input Devices–Pointing Device • Touchpad

  8. Input Devices–Pointing Device • Pointing stick

  9. Input Devices–Pointing Device • Joystick • Used often for games • Can be used instead of a mouse

  10. Input Devices–Pointing Device • Graphics tablet • Stylus • Puck

  11. Input Devices–Pointing Device • Touch screens • Used in kiosks, a self-contained station • Kiosks are found in libraries, museums, airports, and shopping malls

  12. Input Devices–Pointing Device • Pen-based computing

  13. Magnetic-Ink Character Recognition (MICR) • A type of source data automation • Used most by the banking industry • MICR numbers printed on checks

  14. SCANNERS • Use laser light • 3 types • Flatbed scanner • Sheetfed scanner • Handheld scanner

  15. SCANNERS (Extra) • Flatbed scanner • Scans one sheet at a time • Can be used on books • Can scan 3-D objects • Take a lot of desk space

  16. SCANNERS (Extra) • Sheetfed scanner • Scans one sheet at a time • Cannot scan bound material • Take less space than flatbed

  17. SCANNERS (Extra) • Handheld scanner • Least expensive • Least accurate • May require several passes to get a complete page scanned in

  18. Optical Recognition • Optical Mark Recognition (OMR) • For “reading” marks, lines, filled circles, etc • Optical Character Recognition (OCR) • Analyzes an image, converts it into characters • Can recognize handwritten characters if done in block printing

  19. Optical Recognition • Bar codes • Universal Product Code (UPC) is one standard • Other codes exist

  20. Voice Input • Speech recognition • Speaker-dependent • “trained” for a specific person’s voice • Speaker-independent • Recognize any voice • Limited vocabulary

  21. Input Device • Digital camera • No film • Uses memory chips, disks, or memory sticks

  22. Output Devices • CRT monitor • Cathode Ray Tube • Raster scanning • 3 colors of light: red, green, and blue produce all the colors

  23. Output Devices • CRT monitor quality • Refresh rate (scan rate) = number of • Interlaced vs. non-interlaced • Resolution • More pixels means higher resolution • Dot pitch • Size of monitor

  24. Output Devices • Flat Panel screen • Liquid crystal display (LCD) • Active matrix (TFT) • Passive matrix

  25. Computer Output • Monitor • Softcopy • Printer • Hardcopy • Portrait vs. landscape • Resolution in dpi (dots per inch)

  26. Computer Output • Voice output • Speech synthesis • Synthesis by analysis • Synthesis by rule • Music and sound output • MIDI

  27. Computer Output • Graphics cards – provide output to a monitor • Have memory chips on the card • Graphics standards • SVGA - Super Video Graphics Array • XGA – Extended Graphics Array • XGA supports more simultaneous colors than SVGA

  28. Output Devices • Dot-matrix printer • Impact • Pins striking a ribbon against paper • Used for multiple part forms

  29. Output devices • Laser printer • Non-impact • Light beam helps transfer images to paper • High quality • Uses toner and technology similar to a photocopier

  30. Output Devices • Ink-jet printer • Non-impact • Spray ink onto paper • Good quality • Most can print in color

  31. Computer Terminal • Dumb terminal • Keyboard and monitor • No processing capability • Intelligent terminal • Keyboard, monitor, memory • Some processing capability • Both dumb and intelligent terminals must be connected to a “host” or server computer

  32. Point-of-sale terminal (POS) • Specialized input and output devices • The “cash register” at a supermarket is a POS • Input through keyboard, scale, plus one or more scanners • Output to one or more display devices plus receipt printer

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