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1. Comp 1 | Topic 1 | CPU Inside a CPU <https://drive.google.com/open?id=0By3huYB6iWkZb3o1Z1d4bThzdzg> Parts of a CPU Program Counter - Stores that instruction the CPU is currently doing Accumulator (Stores the running total of a calculation) Cache Memory Data Register (Holds the data currently being calculated) Memory Address Register - hold the address of the data to be calculated (But not the data itself) Control Unit This CONTROLS the instructions and make sure they happen ALU Does the Logic and the calculations (EG 5_5) Von Neumann Architecture The system used for the CPU stating that it must have (for example) ALU, CACHE etc Fetch Execute Cycle Fetch (go get) and instruction to do Decode (Understand) what instruction Execute (RUN) the instruction Performance of the CPU Ways to make