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The computer industry used the term "central processing unit" as early as 1955.
 
The computer industry used the term "central processing unit" as early as 1955.
  
The form, [https://en.wikipedia.org/wiki/Processor_design design], and implementation of CPUs have changed over time, but their fundamental operation remains almost unchanged. Principal components of a CPU include the [https://en.wikipedia.org/wiki/Arithmetic_logic_unit arithmetic logic unit] (ALU) that performs arithmetic and [https://en.wikipedia.org/wiki/Boolean_algebra logic operation]s, [https://en.wikipedia.org/wiki/Processor_register processor register]s that supply [https://en.wikipedia.org/wiki/Operand operand]s to the ALU and store the results of ALU operations, and a control unit that orchestrates the fetching (from memory) and execution of instructions by directing the coordinated operations of the ALU, registers and other components.
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The form, [https://en.wikipedia.org/wiki/Processor_design design], and implementation of CPUs have changed over time, but their fundamental operation remains almost unchanged. Principal components of a CPU include the [https://en.wikipedia.org/wiki/Arithmetic_logic_unit arithmetic logic unit] (ALU) that performs arithmetic and [https://en.wikipedia.org/wiki/Boolean_algebra logic operation]s, [processor register https://en.wikipedia.org/wiki/Processor_register]s that supply [operand https://en.wikipedia.org/wiki/Operand]s to the ALU and store the results of ALU operations, and a control unit that orchestrates the fetching (from memory) and execution of instructions by directing the coordinated operations of the ALU, registers and other components.
  
 
Most modern CPUs are implemented on [https://en.wikipedia.org/wiki/Integrated_circuit integrated circuit] (IC) [https://en.wikipedia.org/wiki/Microprocessor microprocessor]s, with one or more CPUs on a single [https://en.wikipedia.org/wiki/MOSFET metal-oxide-semiconductor] (MOS) IC chip. Microprocessors chips with multiple CPUs are [https://en.wikipedia.org/wiki/Multi-core_processor multi-core processor]s. The individual physical CPUs, '''processor cores''', can also be [https://en.wikipedia.org/wiki/Multithreading_(computer_architecture) multithreaded] to create additional virtual or logical CPUs.
 
Most modern CPUs are implemented on [https://en.wikipedia.org/wiki/Integrated_circuit integrated circuit] (IC) [https://en.wikipedia.org/wiki/Microprocessor microprocessor]s, with one or more CPUs on a single [https://en.wikipedia.org/wiki/MOSFET metal-oxide-semiconductor] (MOS) IC chip. Microprocessors chips with multiple CPUs are [https://en.wikipedia.org/wiki/Multi-core_processor multi-core processor]s. The individual physical CPUs, '''processor cores''', can also be [https://en.wikipedia.org/wiki/Multithreading_(computer_architecture) multithreaded] to create additional virtual or logical CPUs.

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