Hardware

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  • Created by: Epic Al
  • Created on: 27-06-22 17:07
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  • Hardware
    • CPU
      • central processing unit
      • components
        • clock
          • Synchronises actions
        • Control unit
          • fetches program instructions
        • Arithmetic logic unit (ALU)
        • Registers
          • direct access storage for instructions
        • Address bus
          • CPU ->memory
        • Data bus
          • 2 way
        • Control bus
          • 2 way
    • Secondary storage
      • Non volatile memory
      • long term
      • programs and data must be transferred to memory to be accessed by the CPU
      • Large storage capacity
      • Types of secondary storage
        • Magnetic storage
          • High capacity
          • Fast data access
          • has moving parts that will eventually fail
          • noisy
        • Optical storage
          • CD, DVD, Blu-ray
          • portable
          • disks are cheap
          • uses a laser
          • slow to access
          • prone to scratches
        • Solid sate drive (SSD)
          • USB drives, SSD cards, mobile devices and wearables
          • very fast data access
          • no moving parts
          • Low power
          • quiet
          • relatively expensive
          • has a limited number of read-write cycles
    • Embedded systems
      • designed for a specific task
      • customised hardware and software
      • limited memory and processing power
      • low power consumption
      • wireless connectivity
      • minimal or no user interface
      • small physical size
      • responsive to their environment
      • low maintenance
      • usually operate in real time

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