To enable a computer system such that each local arbiter is supposed to output its own priority as the right to use the bus on a common arbitration bus through open-collector-type drivers to determine a winner in arbitration, to expand the bus by way of a channel different from bus signal lines. Certain...http://www.google.com/patents/US5557754?utm_source=gb-gplus-sharePatent US5557754 - Computer system and system expansion unit
