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Control store
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<p>A control store is the part of a <a href="/facts/Central_processing_unit/Jxp1bqMV">CPU's</a> <a href="/facts/Control_unit/8QRX3lwf">control unit</a> that stores the CPU's <a href="/facts/Microprogram/XQEsr2X3">microprogram</a>. It is usually accessed by a <a href="/facts/Microsequencer/7v30jEIr">microsequencer</a>. A control store implementation whose contents are unalterable is known as a <a href="/facts/Read-only_memory/P9QMuDLH">Read Only Memory</a> (ROM) or Read Only Storage (ROS); one whose contents are alterable is known as a Writable Control Store (WCS). </p>