Patents by Inventor James C. Siwik

James C. Siwik 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).

  • Variable loadable character generator
    Patent number: 4703322
    Abstract: A Loadable Character Generator whose operation can be changed to suit various needs, such as foreign language requirements, without hardware change and with minimum hardware. The character generator translates the character code of a character to be displayed to the dot pattern for that particular character, utilizing a minimum of hardware. The loadable character generator of the invention replaces the ROM/PROM by a RAM utilizing 2K and 8 RAM memories, a 4K by 8 memory, 4 MUX chips, and a Motorola 6845 CRT Controller with various registers and is loaded through the attribute buffer.
    Type: Grant
    Filed: January 5, 1987
    Date of Patent: October 27, 1987
    Assignee: Honeywell Information Systems Inc.
    Inventors: Gary J. Goss, Thomas O. Holtey, James C. Siwik
  • Diskette subsystem fault isolation via video subsystem loopback
    Patent number: 4667329
    Abstract: A data processing system includes a cathode ray tube (CRT) display subsystem and a floppy disk subsystem. The logic of both systems are verified by generating and transferring a fixed format stream of data bits from the CRT display subsystem to the floppy disk subsystem in modified frequency modulation (MFM) mode and checking the information received by the floppy disk subsystem against the original information presented to the CRT display subsystem.
    Type: Grant
    Filed: November 30, 1982
    Date of Patent: May 19, 1987
    Assignee: Honeywell Information Systems Inc.
    Inventors: Thomas L. Murray, Jr., James C. Siwik, Thomas O. Holtey
  • Firmware simulation of diskette data via a video signal
    Patent number: 4631699
    Abstract: A data processing system includes a cathode ray tube (CRT) display subsystem and a floppy disk subsystem. The logic of both systems are verified by generating and transferring a fixed format stream of data bits from the CRT display subsystem to the floppy disk subsystem in modified frequency modulation (MFM) mode and checking the information received by the floppy disk subsystem against the original information presented to the CRT display subsystem.The bit rate of the data stream is varied depending on the number of address locations used in the data RAM of the CRT display subsystem to store each data bit.
    Type: Grant
    Filed: November 30, 1982
    Date of Patent: December 23, 1986
    Assignee: Honeywell Information Systems Inc.
    Inventors: James C. Siwik, Thomas L. Murray, Jr., Thomas O. Holtey