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1. CPU

   • ALU
   • registers
   • internal memory
     • fast access temporary storage
     • level 1 cache memory
   • controller
     • sends and receives signals from all parts of the computer.
     • controller sends signals to RAM
   • FDE
     • fetch
       • takes the address required from memory, stores it in the current instruction register, & moves the program counter on one so that it points at the next instruction
     • decode
       • authenticates the instruction in the current instruction register. then is decoded to determine the action that needs to be carried out
     • execute
       • actual actions that happen during execution cycle depend on the instruction itself
   • Buses