Communications: electrical – Digital comparator systems
Patent
1975-06-30
1976-11-23
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 304, G06F 1300
Patent
active
039939812
ABSTRACT:
In a data processing system having a plurality of units coupled for the transfer of information therebetween over a common electrical bus during asynchronously generated information bus transfer cycles, the units are coupled in a priority network and depending upon their respective priority may gain access to the bus before a lower priority unit is so enabled. Each one of the units includes apparatus for responding to a request for the transfer of information from another unit by providing any one of up to three signal responses including a positive acknowledge signal indicating an immediate response, a negative acknowledge signal indicating that the unit will most likely be busy for a relatively extended period of time and a quasi-negative response indicating that the unit will probably be ready during the next asynchronously generated bus transfer cycle.
REFERENCES:
patent: 3710324 (1973-01-01), Cohen et al.
Barlow George J.
Bekampis George J.
Cassarino, Jr. Frank V.
Conway John W.
Lemay Richard A.
Chapnick Melvin B.
Honeywell Information Systems Inc.
Reiling Ronald T.
Shaw Gareth D.
Solakian John S.
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