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  • Central processing unit (CPU): Controls the operation of the computer and  performs its data processing functions; often simply referred to as processor.
  • Main memory: Stores data.
  • I/O: Moves data between the computer and its external environment.
  • System interconnection: Some mechanism that provides for communication among CPU, main memory, and I/O. A common example of system interconnection is by means of a system bus, consisting of a number of conducting wires to which all the other components attach.

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