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Input and Output Devices in Computing

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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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