Abstract: A device for coupling several data processing units to a central memory, the processing units being each provided with means for exchanging data with peripheral devices and with computing means, the device includes management means for controlling the sequential execution of orders issued from the memory, according to a hierarchical classification of the lists of tasks for the exchange processes and the computing process and further includes devices for commutation upon control of decoding means of a signal produced by the processing units, in accordance with the value of a binary digit associated to a task of a fresh list of actuatable tasks established in a non-hierarchical system.

Abstract: Microprogrammed computing device comprising a data processing system, a central memory operatively connected thereto, means for exchanging data with peripheral devices, a system for controlling the execution of orders issued from the memory, a system for hierarchically classifying the tasks in a list and making the processing system available for the task having the first priority and a system for managing said list, means for testing the availability of said peripheral devices and means for adapting the processing system to each new task to which the first priority is given, whereby several computing and data exchange processes may be performed by the same device.