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Dewayne Ferris Phones & Addresses
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40440 Franklin Mill St, Novi, MI 48375 (248) 478-1452
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Taylor, MI
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Durham, NC
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Brighton, MI
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Us Patents
Windowing And Scrolling For A Cathode-Ray Tube Display
View pageUS Patent:
46334157, Dec 30, 1986
Filed:
Jun 11, 1984
Appl. No.:
6/619373
Inventors:
Anthony B. Vink - Canton MI
Edward F. Asam - Ann Arbor MI
Dewayne J. Ferris - Brighton MI
Edward F. Asam - Ann Arbor MI
Dewayne J. Ferris - Brighton MI
Assignee:
Northern Telecom Limited - Montreal
International Classification:
G06F 314
G09G 100
G09G 100
US Classification:
364521
Abstract:
A method and a circuit for producing an independent scrollable display region (sometimes referred to as a "window") on the face of a cathode-ray tube (CRT) in a bit-mapped data display system is disclosed. Circuitry is provided to detect the presence of the window along a vertical axis and to detect the presence of the window along a horizontal axis. When both a vertical and a horizontal presence are detected simultaneously, a window is deemed to be present. When the window is deemed to be present a memory address selection circuit selects memory addresses from one memory address circuit and when the window is deemed to be not present, the memory address selection circuit selects memory addresses from another memory address circuit.