A microprocessor device used as an adapter for a communications loop of the closed-ring, token-passing, local area network type is disclosed. Each station on the ring has a host processor with a host CPU, a main memory, and a system bus. The microprocessor device therein which operates relatively independently...http://www.google.de/patents/US4777591?utm_source=gb-gplus-sharePatent US4777591 - Microprocessor with integrated CPU, RAM, timer, and bus arbiter for data communications systems
