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System unit - Coggle Diagram

- - - - Data bus
      - Address bus
      - Control bus
    - - Determines the number of bits of data the computer can transmit at one time
  - - - Decode
        
        Identify the operation code and operands in an instruction
      - Fetch
        
        Read next instruction from main memory into instruction register (IR)
      - Execute
        
        Interpret the operation code and perform the required operation
        
        If have interrupt
        
        CPU saves the current process status
        
        Interrupt served
        
        CPU resumes the operation
        
        Handles the interrupt immediately
- - - - Printer, monitor
    - - USB flash drive
    - - Keyboard, mouse, microphone, scanner, digital video camera
    - - Broadband modem
  - - - Provide sockets for CPU, Memory chips and expansion slots
      - Contains circuitry that connects components