Note that these are devices you can still purchase. Review what the processor's structure is, what it does, how it does it, how it fit into the development of the processor scene at the time, what computer devices it was actually used for and what superseded it. What were the advantages of that device compared to its contemporaries? What were its main technical advantages or disadvantages over others that were out at the time?

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.