IT Revision

Input Devices

  • Mouse
  • Keyboard
  • Camera
  • Scanner
  • Webcam
  • Trackball
  • Gamepad
  • Microphone
  • Electronic Whiteboard
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Output Devices

  • Monitor
  • Printers
  • Projector
  • Speakers
  • LCD Projection Panels
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Both Input And Output Devices

  • Modems
  • Network Cards
  • Touch Screen
  • Headsets
  • Fax
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Operating Systems

There are a few common operating systems available:

  • Mac OS X
  • Linux
  • Windows
  • Android (based on Linux)
  • iOS
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Operating Systems Functions

  • interface - provides a user interface so it is easy to interact with the computer
  • manages the CPU- runs applications and executes and cancels processes
  • multi-tasks - allows multiple applications to run at the same time
  • manages memory- transfers programs into and out of memory, allocates free space between programs, and keeps track of memory usage
  • manages periherals - opens, closes and writes to peripheral devices such as storage attached to the computer
  • organises - creates a file system to organise files and directories
  • security - provides security through user accounts and passwords
  • utilities - provides tools for managing and organising hardware
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