G - Physics – 09 – G
Patent
G - Physics
09
G
375/46
G09G 1/00 (2006.01) G09G 5/14 (2006.01)
Patent
CA 1249679
-33- ABSTRACT OF THE DISCLOSURE METHOD OF ELECTRONICALLY MOVING PORTIONS OF SEVERAL DIFFERENT IMAGES ON A CRT SCREEN A method of electronically moving portions of several different images on a CRT screen includes the steps of: storing a first image in one section of an image memory, and storing a second image in a different section of the image memory; storing control bits in a control memory which define high and low priority viewports on the screen and correlate portions of the first and second images to the high and low priority viewports respectively; displaying, in response to the stored control bits, the entire portion of the image in the high priority viewport and only the non-overlapping portion of the image in the low priority viewport by transferring the image portions from the image memory to the screen with no frame buffer therebetween; modifying at least some of the stored control bits to change the priorities of the high and low priority viewports to low and high respectively; and repeating the displaying step, in response to the modified control bits, to display the entire portion of the image in the new high priority viewport and only the non-overlapping portion of the image in the new low priority viewport.
466941
Bass Leland J.
Quick Roy F. Jr.
Shah Ashwin V.
Wickwire Ralph O.
Burroughs Corporation
R. William Wray & Associates
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