Abstract: A peripheral circuit interface adapter for a computer system is defined whose function is established programmatically rather than being designed, laid out and fabricated uniquely for each different function the interface adapter might perform. A designer can program the interface adapter function and then cause that function to be defined dynamically through downloading on the interface adapter when the system on which it resides is powered on. The interface adapter contains rudimentary bus interface elements and external interface section and a control section. The control section establishes the overall function of the adapter and is defined by a field programmable gate array that assumes specific wiring characteristics as a result of downloading from the hosting system.

Abstract: The improved I/O controller includes a data processing element for executing a sequence of stored program instructions to control the transfer of data between respective ones of a plurality of I/O devices and the host computer. The controller further includes a memory element for storing the program instructions and parameter tables associated with the transfer of data. A first sequence of stored program instructions defines a first communications protocol and a second sequence of stored program instructions defines a second communications protocol. A first control table is associated with a first I/O device, for relating the first device to the first program instructions and a second control table is associated with a second I/O device, for relating the second I/O device to the second program instructions.