A microprocessor-based system serves as a message routing switch for communication between a number of different devices. Any device attached to the switch can communicate with any other attached device through a number of serial and parallel Input/Output ports. Communication between devices attached...http://www.google.es/patents/US4174536?utm_source=gb-gplus-sharePatente US4174536 - Digital communications controller with firmware control
Digital communications controller with firmware control
