A system for communicating between a plurality of nodes in a computer, each node including logic circuitry or transmitting and receiving data at first and second logic levels. The system includes an arbiter coupled to the nodes for detecting a lack of request activity from the nodes. A default generator...http://www.google.com.au/patents/US4837736?utm_source=gb-gplus-sharePatent US4837736 - Backplane bus with default control
