System for arbitrating use of I/O bus by co-processor and higher priority I/O units in which co-processor automatically request bus access in anticipation of need
Peripheral device interface and controller
System for loading initial program loader routine into secondary computer without bootstrap ROM
Communications controller interface Patent #: 4945473
ApplicationNo. 136467 filed on 10/13/1993
US Classes:717/173, Including downloading703/25, I/O adapter (e.g., port, controller)713/1DIGITAL DATA PROCESSING SYSTEM INITIALIZATION OR CONFIGURATION (E.G., INITIALIZING, SET UP, CONFIGURATION, OR RESETTING)
ExaminersPrimary: Harrell, Robert B.
Attorney, Agent or Firm
Foreign Patent References
International ClassG06F 013/12
AbstractA method and apparatus for downloading instructions and other information to a peripheral controller for use in an Industry Standard Architecture (ISA) compatible computer provides a system which downloads instructions from the ISA compatible computer to an random access memory (RAM) accessible by the peripheral controller. The peripheral controller then executes these instructions to emulate the functions of conventional INTEL 8042 and 8742 series integrated circuits. The peripheral controller also provides other features not provided by the conventional 8042 or 8742 by executing other downloaded instructions located in the RAM.