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control unit

noun, Computers.
the part of a CPU that interprets the instructions in programs and directs the operation of the entire system.
controller (def 5).
Origin of control unit
1960-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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control unit in Technology

1. The part of a CPU that sends control signals to other components to cause them to execute the machine cycle - fetch, decode, execute, store.
2. Any device that controls the I/O operations of one or more peripheral devices, e.g. a disk controller.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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