Bus and Tag is an IBM standard for a computer peripheral interface, and was commonly used to connect their mainframe computers to peripheral devices such as line printers, disk storage, magnetic tape drives and IBM 3270 display controllers. The technology uses two or three sets of thick, multi-connector copper cables, one or two sets, carrying data, called the bus, and the other set, carrying control information, called the tag.
Bus and Tag is an IBM standard for a computer peripheral interface, and was commonly used to connect their mainframe computers to peripheral devices such as line printers, disk storage, magnetic tape drives and IBM 3270 display controllers. The technology uses two or three sets of thick, multi-connector copper cables, one or two sets, carrying data, called the bus, and the other set, carrying control information, called the tag.
Source: Wikipedia "Bus and Tag" · CC BY-SA 4.0
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