A peripheral system has one or more buffered control units connected to a plurality of peripheral devices. Operation times of the devices are marked by the buffer and controls which overlap device operations, queue device operations in a priority set of queues, and prioritize peripheral system operations....http://www.google.com/patents/US4423480?utm_source=gb-gplus-sharePatent US4423480 - Buffered peripheral system with priority queue and preparation for signal transfer in overlapped operations
