Boots – shoes – and leggings
Patent
1980-04-14
1983-12-06
Zache, Raulfe B.
Boots, shoes, and leggings
G06F 304
Patent
active
044197241
ABSTRACT:
In a data processing system having a plurality of units and a priority controller for controlling access to a bus by any of the units, each of the units is provided with a lock register having a stage corresponding to each unit connected to the bus. Each word placed on the bus by a source unit includes a lock bit which, in each unit except the source and destination units, sets the stages of the lock registers corresponding to the source and destination units. When a stage of a lock register is set it prevents the unit in which the register is located from attempting to communicate with a unit whose stage of the lock registers is set. On the last transmission between two units the word placed on the bus has a false lock bit which resets the stages of all of the lock registers corresponding to the source and destination units.
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Ansi Tec. Committee X3T9 Minicomputer Project 54, "USA Contribution to ISO TC97/SC13 for a Small Computer-to-Peripheral Bus Interface Standard, Dec. 12, 1978.
Branigin Michael H.
Krasucki, Jr. Joseph F.
Sherbert Edward G.
Bell James R.
Eng David Y.
Sperry Corporation
Truex Marshall M.
Zache Raulfe B.
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