Patents by Inventor Patrick Kam

Patrick Kam 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).

  • DMA emulation for non-DMA capable interface cards
    Patent number: 5784595
    Abstract: A method and system are disclosed for simulating a direct memory access (DMA) function to access memory in a host computer having a DMA controller for the purpose of enabling the transfer of data between the host memory and a computer accessory data handling device not capable of DMA operation. The accessory data handling device can be operably connected to the host. The address contents of the DMA controller can be read to determine the location in the host memory where data is to be transferred from the host memory to the accessory data handling device or from the accessory data handling device to the host memory. Data is read from the host memory at the address specified in the DMA controller and written to the accessory data handling device or read from the accessory data handling device and written to the host memory at the address specified by the DMA controller, respectively.
    Type: Grant
    Filed: August 7, 1997
    Date of Patent: July 21, 1998
    Assignee: International Business Machines Corporation
    Inventors: Robert J. Devins, Stephen Hon, Patrick Kam, Emory D. Keller