In a communication system having a processor unit (10) and a plurality of types of modules (12) each one located at a respective addressable location accessible by the processor unit (10), each module is provided with a respective memory means (14) containing data representing the compatibility status of the module relative to the processor unit. The data comprises a base indicia indicating the backward compatibility level of the module relative to the software of the processing unit (10) and a current indicia indicating the present compatibility level of the module relative to the software of the processing unit.
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