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The System Unit of a Computer System - Coggle Diagram

- - - - Control Unit (CU)
      - Arithmetic and Logical Unit (ALU)
      - Registers
        
        General Purpose Registers (GPRs)
        
        Accumulator (AX)
        
        Base register (BX)
        
        Counter (CX)
        
        Data register (DX)
        
        Control Registers
        
        Instruction Register (IR)
        
        Program Counter (PC)
        
        Memory Access Register (MAR)
        
        Memory Data Register (MDR)
        
        Status Registers
      - System bus (bus line)
        
        Data bus
        
        Address bus
        
        Control bus
      - Machine cycle
        
        Fetch
        
        Decode
        
        Execute
        
        Interrupt
        
        Clock rate
        
        Word length
    - - Random Access Memory (RAM)
      - Read-only Memory (ROM)
        
        Erasable programmable ROM (EPROM)
        
        Electrically erasable programmable ROM (EEPROM)