An interactive terminal system includes a high speed link controller (HSLC) and a number of work stations, all coupled in common to a single conductor coaxial bus. The HSLC includes apparatus controlled by a microprocessor to put the HSLC in a wraparound test mode. The microprocessor transfers test bytes...http://www.google.ca/patents/US4514806?utm_source=gb-gplus-sharePatent US4514806 - High speed link controller wraparound test logic
