Boots – shoes – and leggings
Patent
1981-05-06
1983-02-01
Atkinson, Charles E.
Boots, shoes, and leggings
371 16, G06F 1100
Patent
active
043719520
ABSTRACT:
A data processing system that has a plurality of subsystems connected to a system bus includes diagnostic circuitry for isolating a fault at one of the subsystems. The diagnostic circuitry includes a multiplexer at the output gates of each subsystem to the system bus and diagnostic selection circuitry at a bus controller that provides a select signal to each multiplexer. When selected, the multiplexer is connected to pass a "high" logic level signal to an associated bit line of the system bus. When a bit line of the system bus is "stuck high," because of a fault at the output of one of the subsystems, the diagnostic circuitry selectively connects each subsystem to the bit line of the system bus in order to provide a "high" logic level signal to that bit line. A test interface and A/D converter are connected to the bit line, and if a voltage level change is detected after a subsystem is connected, the connected subsystem is not the one having the fault. If no voltage level change is detected, it is known that that subsystem is the faulty one.
REFERENCES:
patent: 3573751 (1971-04-01), DeLisle
patent: 4149241 (1979-04-01), Patterson
Atkinson Charles E.
Cavender J. T.
Dugas Edward
Heckler Thomas M.
Jewett Stephen F.
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