Boots – shoes – and leggings
Patent
1981-08-24
1984-06-26
Chan, Eddie P.
Boots, shoes, and leggings
370 85, G06F 304
Patent
active
044569564
ABSTRACT:
A computer network is disclosed in which a plurality of computer stations are interconnected by a single bi-directional bus and wherein access to the bus is controlled by the computer stations themselves through an adapter unit at each station. Each adapter unit includes a microcontroller, a transmitter, a receiver, a send buffer, a receive buffer, a line activity indicator, a pulse producing device, a read circuit and a write circuit. Each adapter unit has a unique assigned number. When the network is running and stable, control of the bus is continually passed from one live adapter unit to another in numerical sequence according to its unique assigned number and the bus is active with messages, control signals or status signals separated by relatively short intervals. If only one adapter unit is live, control is continually passed to itself. If an adapter unit in control attempts to access another adapter unit to send data to it and the other adapter unit is unable to comply with the request because its buffers are full, the numerical control passing sequence is temporarily interrupted and control is passed out of turn to that other adapter unit so that it can unload its buffers. After the buffers are unloaded, control is then passed back to the adapter unit from which it received control and the normal passing sequence is resumed. If the bus is inactive for a certain time interval, all adapter units detecting this condition enter an election mode to elect from amongst themselves one adapter unit to assume control and resume activity.
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patent: 4161786 (1979-07-01), Hopkins et al.
patent: 4170038 (1979-10-01), Bouvier et al.
patent: 4245299 (1981-01-01), Words et al.
patent: 4281380 (1981-07-01), De Mesa et al.
patent: 4335426 (1982-06-01), Manwell et al.
El-Gohary Hussein T.
Nelson Keith F.
Vaillette Gary P.
Chan Eddie P.
Data General Corp.
Frank Jacob
Kriegsman Irving M.
Wall Joel
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