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Unit Control Block information


In IBM mainframe operating systems OS/360 and its successors, a Unit Control Block (UCB) is a memory structure, or a control block, that describes any single input/output peripheral device (unit), or an exposure (alias), to the operating system. Certain data within the UCB also instructs the Input/Output Supervisor (IOS) to use certain closed subroutines in addition to normal IOS processing for additional physical device control.

Some other operating systems have similar structures.

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Unit Control Block

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successors, a Unit Control Block (UCB) is a memory structure, or a control block, that describes any single input/output peripheral device (unit), or an exposure...

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Engine control unit

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An engine control unit (ECU), also called an engine control module (ECM), is a device which controls multiple systems of an internal combustion engine...

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Electronic control unit

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electronic control unit (ECU), also known as an electronic control module (ECM), is an embedded system in automotive electronics that controls one or more...

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Concrete block

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A concrete block, also known as a cinder block in North American English, breeze block in British English, concrete masonry unit (CMU), or by various...

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Camera control unit

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The camera control unit (CCU) is typically part of a live television broadcast chain. It is responsible for powering the professional video camera, handling...

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Task Control Block

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The Task Control Block (TCB) contains the state of a task in, e.g., OS/360 and successors on IBM System/360 architecture and successors. In OS/360, OS/VS1...

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List of Unicode characters

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block) Balinese (Unicode block) Batak (Unicode block) Bhaiksuki (Unicode block) Buhid (Unicode block) Buginese (Unicode block) Chakma (Unicode block)...

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Railway signalling

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interlocked block signalling and other safety measures as a direct result of the Armagh rail disaster in that year. Most forms of train control involve movement...

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Central processing unit

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supply operands to the ALU and store the results of ALU operations, and a control unit that orchestrates the fetching (from memory), decoding and execution...

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Yamaha RM1x

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rack-mounting the unit. The RM1x is organized into five blocks: sequencer block, tone generator block, controller block, effect block, and arpeggio block. The sequencer...

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Control flow

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but they are usually not termed control flow statements. A set of statements is in turn generally structured as a block, which in addition to grouping...

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Parkway Garden Homes

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Parkway Gardens Apartment Homes, commonly known as O-Block, is a 694-unit privately owned apartment complex located in Greater Grand Crossing area, and...

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Barrier troops

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Barrier troops, blocking units, or anti-retreat forces are military units that are located in the rear or on the front line (behind the main forces) to...

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UCB

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Burkinabé Communists, a political party in Burkina Faso in the 1980s Unit Control Block, in computing, an area of memory in IBM's z/OS United Cricket Board...

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Industrial control system

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industrial control system (ICS) is an electronic control system and associated instrumentation used for industrial process control. Control systems can...

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Block

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Look up Block, Blocks, block, blocked, or blocks in Wiktionary, the free dictionary. Block or blocked may refer to: Block programming, the result of a...

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Transmission block

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or recorded as a unit. Some protocols require each transmission block to end with an end-of-message marker. This is often a control character such as...

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Copolymer

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composition or sequence distribution of constitutional units. Block copolymers are made up of blocks of different polymerized monomers. For example,...

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Base station subsystem

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stations). A BTS is controlled by a parent BSC via the "base station control function" (BCF). The BCF is implemented as a discrete unit or even incorporated...

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Apartment

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English, Indian English, South African English), or unit (Australian English) is a self-contained housing unit (a type of residential real estate) that occupies...

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United States Air Force Tactical Air Control Party

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Special Operation Forces, and Tier 1 combat maneuver units. They provide precision terminal attack control and terminal attack guidance of U.S. and coalition...

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Disk sector

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filesystem block is an abstraction over disk sectors possibly encompassing multiple sectors. In other contexts, it may be a unit of a data stream or a unit of...

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Memory management unit

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A memory management unit (MMU), sometimes called paged memory management unit (PMMU), is a computer hardware unit that examines all memory references...

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Computer terminal

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VDU were the Univac Uniscope and the IBM 2260, both in 1964. These were block-mode terminals designed to display a page at a time, using proprietary protocols;...

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