INPUT AND OUTPUT

INPUT AND OUTPUT

1. Input

   • Data or instruction used by computer
   • Input Device
     • Translates data into a form
     • Example devices
       • Keyboard
       • Scanning
         • Scanning devices example
           • RFID readers
             • Reads information on the tag via radio waves
           • Character and mark recognition readers
             • Recognize special character and marks
               • MICR
               • OCR
               • OMR
           • NFC readers
             • Uses close-range radio signals to communicate between 2 devices or objects

2. Output

   • Processed data or information
   • Type output
     • Text
     • Graphics and audio
     • Video
   • Devices
     • Monitor
       • Screen or display screens that display visual image of text and graphics
     • Printers
       • Translates information that processed by system unit
       • Nonimpact printer
         • Forms character and graphics on a paper without striking the paper
         • Noiseless, fast and high quality
         • Expensive
         • Dot-matrix printer
       • Impact printer
         • Forms characters and graphics on a paper by striking a mechanism against an inked ribbon
         • Noisy , slow and poor quality
         • Cheap
         • Ink-jet
   • Output referred as hard copy

3. Combination input and output devices

   • Headsets
     • Combine microphone and headphones
   • Telephones
     • Voice-over IP, hangouts and facetime