Input-output system having cyclical scanning of interrupt reques

Details Input-output system having cyclical scanning of interrupt reques Input-output system having cyclical scanning of interrupt reques

1974-08-07

1976-04-06

Zache, Raulfe B.

Communications: electrical

Digital comparator systems

G06F 304, G06F 918, G05B 1302, G08B 1100

Patent

active

039493717

ABSTRACT:
A system is disclosed for controlling access to a central information processor by a plurality of peripheral devices. The system determines access on the basis of a (1) predetermined hierarchical priority order and (2) a cyclical scanning process. To achieve this, a system of hierarchically organized priority levels is combined with a system of cyclical scanning in a manner such that no single device may monopolize the central processor.

REFERENCES:
patent: 3643229 (1972-02-01), Stuebe et al.
patent: 3710328 (1973-01-01), Hunter et al.

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