Patents Represented by Attorney James Hoffman
  • Patent number: 5420779
    Abstract: A circuit and method for protecting a voltage inverter circuit is disclosed. The circuit comprises a first comparison circuit capable of comparing a first reference voltage to a voltage indicative of the load current of the voltage inverter. When the comparison circuit signals that the first reference voltage is greater than the load voltage, a disable circuit coupled to the first comparison circuit disables the voltage inverter. In the preferred embodiment, the inverter provides power to a cold cathode fluorescent lamp which, if damaged, can harm the inverter.
    Type: Grant
    Filed: March 4, 1993
    Date of Patent: May 30, 1995
    Assignee: Dell USA, L.P.
    Inventor: Rodger E. Payne
  • Patent number: 5404454
    Abstract: An apparatus and method for a computer system having at least two disk drives in a data storage system wherein data may be read from or written to the disk drives simultaneously during a load multiple operation. Data from the disk drives may be simultaneously loaded into two different memory buffers utilizing the maximum available I/O data bus bandwidth.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: April 4, 1995
    Assignee: Dell USA, L.P.
    Inventor: Terry J. Parks
  • Patent number: 5388267
    Abstract: A computer which carries its BIOS in a Flash EPROM. A UV-EPROM carries a redundant BIOS, which can be overlaid onto the BIOS address space by selection with a physical switch.The BIOS contains a small core software program, at the BIOS entry point, which checks BIOS integrity, and provides for reloading the Flash EPROM's BIOS if needed (from a floppy disk, or by copying the entire contents of the UV-EPROM).
    Type: Grant
    Filed: May 29, 1991
    Date of Patent: February 7, 1995
    Assignee: Dell USA, L.P.
    Inventors: Wai-Ming R. Chan, Eric W. Schieve, Charles P. Zeller, Gary W. Abbott
  • Patent number: 5369771
    Abstract: A computer system having power management control features which include states of normal clock speed operation, slow clock speed operation, and stop-clock operation based on input/output activity, system bus activity, and program parameters. The system detects inactivity over a period of time and places the system in one of the states to provide for power conservation and accessibility by a user.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: November 29, 1994
    Assignee: Dell U.S.A., L.P.
    Inventor: Steven K. Gettel