An input/output control system has a control unit including a first controller connected between a channel and a data buffer for controlling the transfer of data therebetween and a second controller connected between the data buffer and a plurality of input/output devices for controlling the transfer...http://www.google.de/patents/US4754399?utm_source=gb-gplus-sharePatent US4754399 - Data transfer control system for controlling data transfer between a buffer memory and input/output devices
