Patents by Inventor John C. Andoh

John C. Andoh 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).

  • Multiple domain emulation system with separate domain facilities which tests for emulated instruction exceptions before completion of operand fetch cycle
    Patent number: 5210832
    Abstract: In a data processing apparatus, having a user domain with domain storage space and an emulation domain with emulation storage space, emulates an instruction in the user domain by calling a program of instructions in the emulation domain. An instruction register connected to receive the sequence of instructions is partitioned into a plurality of fields. At least one field of the instruction register identifies a location for address information for an operand used in execution of the instruction. The instruction is decoded to generate a control code. The control code includes a branch signal to call the emulation program and a domain access control signal to indicate whether the emulation program requires access to the user domain storage base for execution. During execution of the emulation routine, domain access is implied by the location identified for the address information--a set of locations having been preselected as address registers for implied domain addressing.
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: May 11, 1993
    Assignee: Amdahl Corporation
    Inventors: Robert M. Maier, John C. Andoh, Arno S. Krakauer, Richard J. Tobias, Allan J. Zmyslowski
  • Addressing multiple storage spaces
    Patent number: 4785392
    Abstract: In a data processing apparatus, having a user domain with domain storage space and an emulation domain with emulation storage space, emulates an instruction in the user domain by calling a program of instructions in the emulation domain. An instruction register connected to receive the sequence of instructions is partitioned into a plurality of fields. At least one field of the instruction register identifies a location for address information for an operand used in execution of the instruction. The instruction is decoded to generate a control code. The control code includes a branch signal to call the emulation program and a domain access control signal to indicate whether the emulation program requires access to the user domain storage base for execution. During execution of the emulation routine, domain access is implied by the location identified for the address information--a set of locations having been preselected as address registers for implied domain addressing.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: November 15, 1988
    Assignee: Amdahl Corporation
    Inventors: Robert M. Maier, John C. Andoh, Arno S. Krakauer, Richard J. Tobias, Allan J. Zmyslowski