Patents by Inventor John A. DeRosa, Jr.

John A. DeRosa, Jr. 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).

  • Patent number: 4742451
    Abstract: A central processor unit for a digital data processing system that processes prefetched instructions including a conditional branch instruction. The processor includes a fetch unit that has separate portions, one that retrieves operands and the other that retrieves instructions. When the fetch unit fetches a conditional branch instruction, it may continue to prefetch "branch not taken" instructions using the instruction fetch portion. The fetch unit initially uses the operand fetch portion to prefetch "branch taken" instructions. If it is determined that the branch is not taken, the prefetch operation is aborted, otherwise the prefetch operation is allowed to continue to provide the next instruction used by the processor.
    Type: Grant
    Filed: May 21, 1984
    Date of Patent: May 3, 1988
    Assignee: Digital Equipment Corporation
    Inventors: William F. Bruckert, Tryggve Fossum, John A. DeRosa, Jr., Richard E. Glackemeyer, Allan E. Helenius, John C. Manton