Boots – shoes – and leggings
Patent
1981-12-21
1983-10-11
Springborn, Harvey E.
Boots, shoes, and leggings
G06F 304, G06F 504, G06F 922, G06F 1120
Patent
active
044096569
ABSTRACT:
A node device for use in a digital data processing and communications system of the type utilizing a bus organization for facilitating the interconnection of a large plurality of digital data processing devices (user devices) in which redundant cables are employed. The node devices are interposed between the user devices and the redundant cables to permit automatic reconfiguration of the interconnection of the user devices in the event of malfunctioning or severing of one or more of the cable sets within a minimum period of time. The node devices provide the user devices with the structure needed to detect and diagnose system problems and to effect recovery procedures. In accordance with the invention, one of the plurality of nodes functions as the Bus Controller and by sampling the remaining nodes in the system, it determines the priority with which user devices may transmit or receive data over the bus. Each of the nodes employed is substantially identical and any one may be selected to function as the Bus Controller. Each includes a Microprogrammed Controller and necessary firmware to permit the controller to function in conjunction with special purpose hardware including a Programmable Logic Array (PLA) configured to perform a pre-processing function on control line inputs so that poll/response traffic on the active cables can continue with a minimum of delay.
REFERENCES:
patent: 3771134 (1973-11-01), Huettner et al.
patent: 4086627 (1978-04-01), Bennett et al.
patent: 4106091 (1978-08-01), Hepworth et al.
patent: 4208714 (1980-07-01), Eklund et al.
patent: 4237534 (1980-12-01), Felix
patent: 4257100 (1981-03-01), Syrbe et al.
patent: 4262357 (1981-04-01), Shima
Andersen Steven C.
Kassel James W.
Newcomer Stephen O.
Penkauskas Thomas P.
Haugen Orrin M.
Her Majesty the Queen in right of Canada as represented by the
Nikolai Thomas J.
Springborn Harvey E.
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