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The Experimental Polyprocessor System (EPOS) is described.It is a new computer system based on the concept of the polyprocessor and is intended to obtain a high degree of extensibility, cost/performance, adaptability and reliability.EPOS is composed of computing modules, input/output mod ~ ules, and shared memory modules which are connected by multiple independent common buses.Modules and system buses can be added or deleted freely to provide a high degree of extensibility.The computing module is using a 7000-gate LSI computing element PULCE and provides extensive support for user and dynamic microprogramming.The input/output modules and the computing modules are connected equally to the system buses, and the same addressing mechanism is applied to them.

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