{
  "id": "enwiki-001355449910",
  "slug": "unit-control-block",
  "title": "Unit Control Block",
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  "lead": "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.",
  "body": "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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  "source_uri": "https://en.wikipedia.org/w/index.php?oldid=1355449910",
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    "title": "Unit Control Block",
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        "family": "Anticloud FZ LLE",
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    ],
    "container-title": "encyclopegia.org",
    "publisher": "Anticloud FZ LLE",
    "publisher-place": "Dubai, United Arab Emirates",
    "URL": "https://encyclopegia.org/a/unit-control-block",
    "issued": {
      "date-parts": [
        [
          2026,
          11,
          14
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          2026,
          11,
          14
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    "license": "CC BY-SA 4.0",
    "DOI": "eo1:enwiki-001355449910",
    "isBasedOn": "https://en.wikipedia.org/w/index.php?oldid=1355449910",
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