A common control circuit card developed to serve the commonly used functions of a variety of data link processors in an I/O subsystem. The common control circuit card when combined with a peripheral dependent circuit board forms a peripheral-controller designated as a data link processor. The common...http://www.google.com/patents/US4322792?utm_source=gb-gplus-sharePatent US4322792 - Common front-end control for a peripheral controller connected to a computer
