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Computer Systems, Mindmap of notes from: http://programmedlessons…

- - - - Barcode Scanner
      - Keyboard
      - Mouse
      - Monitor
      - Printer
      - Speaker
      - Microphone
    - - Secondary Memory
        
        Long term storage
        
        SSD/HDD
        
        Connected with primary memory using busses
        
        non-volatile
        
        large capacity
        
        Doesn't need electricity
      - Primary Memory
        
        Stored Data easily changes
        
        Close, works directly with the processor
        
        Volatile
        
        RAM (Random Access Memory)
        
        Fast memory
        
        Usually low storage space
        
        holds instruction of current program
        
        non-volatile
        
        ROM (Read Only Memory)
        
        Only readable
        
        contains instructions on how the computer starts up
        
        Needs constant electricity to run
  - - - CPU does the fundamental computing within the system, and directly or indirectly controls all the other components.