An apparatus and method for improving the input/output performance of a computer system under the control of a multi-tasking, multi-threaded operating system. In particular, the invention provides an apparatus and method to chain contiguous DMA scatter gather sub blocks of a PRD table for channel 0 with...http://www.google.com/patents/US5894560?utm_source=gb-gplus-sharePatent US5894560 - Method and apparatus for controlling I/O channels responsive to an availability of a plurality of I/O devices to transfer data