Patents by Inventor Karl W. Stevens

Karl W. Stevens 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).

  • I/O Interrupt sequencing for real time and burst mode devices
    Patent number: 4275440
    Abstract: An improved I/O interrupt sequencing method and apparatus including generation of an instruction priority request signal to indicate that a real time task requires programmed I/O service. Generating an end of chain signal to suspend burst I/O control of the I/O bus and allow programmed I/O service to a real time device, and resetting the instruction priority request signal to allow burst mode data transfer to continue at the count positions at which it was suspended.
    Type: Grant
    Filed: October 2, 1978
    Date of Patent: June 23, 1981
    Assignee: International Business Machines Corporation
    Inventors: Robert L. Adams, Jr., Carl H. Grant, Karl W. Stevens