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The control unit (CU) is a component of a computer's central processing unit (CPU) that directs the operation of the processor. A CU typically uses a binary decoder to convert coded instructions into timing and control signals that direct the operation of the other units (memory, arithmetic logic unit and input and output devices, etc.).
Premises control unit, the "brain" of a burglar alarm; Telecommunication control unit, a device attached to a computer multiplexer channel which supports multiple terminals; Camera control unit, typically part of a live television broadcast "chain" Electronic control unit, an embedded system that controls electrical systems in a motor vehicle ...
A control store is the part of a CPU's control unit that stores the CPU's microprogram.It is usually accessed by a microsequencer.A control store implementation whose contents are unalterable is known as a Read Only Memory (ROM) or Read Only Storage (ROS); one whose contents are alterable is known as a Writable Control Store (WCS).
It is made up of logically independent control units, but takes up only one of the eight control unit slots which can be connected to a channel. [2]: 8 A two-channel switch is available, allowing the control unit to be connected to two channels, on one or two computer systems, controlled by manual switches or by programming. [2]: 65–66
Memory controller, a unit that manages access to memory; Game controller, a device by which the user controls the operation of the computer; Host controller; Network controller; Graphics controller or video display controller; SCSI host bus adapter; Parallel port controller; Microcontroller unit (MCU) Keyboard controller; Programmable Interrupt ...
A UCB is created for each I/O device. The data in the UCB includes the device's unit number (a part of the device name) and a listhead to which pending I/O requests may be queued. The UCB may have a device-driver defined extension in which the driver can keep driver-defined data that is instantiated for each device. [10]