Patents by Inventor Brion N. Shimamoto

Brion N. Shimamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Microprocessor implemented data processing system capable of emulating execution of special instructions not within the established microprocessor instruction set by switching access from a main store portion of a memory
    Patent number: 4972317
    Abstract: A microprocessor chip which is capable of executing a specific subset of instructions on behalf of the main storage portion of a computer memory can be made to emulate direct execution instructions not in that specific subset while working on behalf a control storage portion of the computer memory in a manner which is transparent to the main storage portion by means of a novel set of operand space selection instructions in the control storage portion and a novel switching circuit on the microprocessor chip which controls the access of the chip to the control store portion and the main store portion.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: November 20, 1990
    Assignee: International Business Machines Corp.
    Inventors: Joseph P. Buonomo, Robert W. Callahan, Steven R. Houghtalen, Sivarama K. Kodukula, Raymond E. Losinger, Brion N. Shimamoto, Harry L. Tredennick, James W. Valashinas