Patents by Inventor Melvyn J. Marple

Melvyn J. Marple 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).

  • Floppy disk controller with means to change clock rate automatically
    Patent number: 4872107
    Abstract: A processor and disk controller are arranged to operate with either of two types of disk drive, a drive for a five and one-fourth inch disk or a drive for an eight inch disk, and a method and apparatus are provided to test a port to detect which type disk is connected. The disk drives do not directly signal their type, and in one operation this information is derived from "drive ready", signals that are supplied separately by each disk type. In an alternative method and apparatus, this information is derived by a test in which the clock speed is changed.
    Type: Grant
    Filed: April 22, 1983
    Date of Patent: October 3, 1989
    Assignee: International Business Machines Corporation
    Inventors: Melvyn J. Marple, Andrew S. Potemski