Chapte r 3 Hardware: Input, Processing, and Output Devices a pc in Every Home


Download 0.67 Mb.
bet5/6
Sana04.04.2023
Hajmi0.67 Mb.
#1323508
1   2   3   4   5   6
Bog'liq
C H A P T E R

Input Devices

  • Source data automation
    • Capturing and editing data where the data is originally created and in a form that can be directly input to a computer.
      • Reduces handling
      • Should incorporate validation

Input Devices

  • PC input devices
  • (keyboard, mouse)
  • Voice recognition devices
  • Digital computer cameras
  • Terminals (dumb)
  • Scanning devices
  • Optical mark readers
  • Magnetic Ink Character Recognition (MICR)
  • Point Of Sale (POS) devices
  • Automatic Teller Machine (ATM)
  • Pen input devices
  • Light pens
  • Touch sensitive screens
  • Bar code scanners
  • Drawing pads

MICR Device

Output Devices

  • Display monitors (CRTs)
  • Liquid Crystal Displays (LCDs)
    • Active
    • Passive
  • Printers and plotters
  • Computer Output Microfilm (COM)
  • MP3 Players

Liquid Crystal Displays (LCD)

  • Passive and active matrix

Monitor Variables

  • Display size (diagonal)
    • 17” is 1.5 times the size of a 14”
    • More spreadsheet, more apps
  • Refresh rate (Hz) (e.g. 75,85,100)
  • Non-interlaced

Monitor Variables

  • Dot pitch
    • Distance between the smallest physical visual component (.25-.31 mm)
  • Pixel
    • Smallest programmable visual element
  • Resolution

Image Variables

  • Display Colors (bit depth)
    • 16 = 4 bits = VGA
    • 256 = 8 bits = SVGA
    • 65,536 = 16 bits = High Color
    • 16.7 million = 32 bits = True Color
  • Video Card Memory Needs
    • (1024x768x32)/8 = 3.1 MB

Download 0.67 Mb.

Do'stlaringiz bilan baham:
1   2   3   4   5   6




Ma'lumotlar bazasi mualliflik huquqi bilan himoyalangan ©fayllar.org 2024
ma'muriyatiga murojaat qiling