Data processing system having a plurality of input/output channe

Details Data processing system having a plurality of input/output channe Data processing system having a plurality of input/output channe

1974-12-20

1977-01-04

Chapnick, Melvin B.

Communications: electrical

Digital comparator systems

G06F 304, G06F 918

Patent

active

040017842

ABSTRACT:
In a data processing system having a plurality of input/output channels, a first plurality of physical resources is dedicated to each of the channels. Said first plurality is sufficient only to enable standard data character exchanges between each of the channels and the central processing unit in a time-sharing manner. A second plurality of physical resources (including registers and logic) is provided which is dedicated to a corresponding plurality of service classes. The service classes are ordered according to a priority criterion and selectively assigned to different channels in accordance with the priority level of the interrupt which has requested the service. In this manner, while services of the same class are not reciprocally interruptible, services of different classes on different channels are hierarchically interruptible.

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patent: 3925766 (1975-12-01), Bardotti et al.

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