G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 13/36 (2006.01) G06F 3/14 (2006.01)
Patent
CA 2097954
NUBUS DUAL DISPLAY CARD ABSTRACT A dual display generator card (10) that is insertable into a Nubus card slot of a computer system (12) that permits the simultaneous generation of images for two display monitors (13, 14). The dual display generator card (10) includes a Nubuscomputer interface (21) and two display channels (30a, 30b). Each display channel (30a, 30b) includes a channel memory buffer (31, 32), two parallel video translators (33), and a digital to analog converter (36). Video output signals from the each display channel (30a, 30b) are provided from the digital to analog converter (36) and are cou- pled to each respective video display monitor (13, 14). Appropriate timing, address, and control hardware are provided to control the generation of video signals. Overlay information derived from the computer system (12) may be overwritten on pixel data to support annotation of images rendered on the display monitors (13, 14). The result is a composite image provided on the two monitors (30a, 30b). Each of the two images is a combination of pixel image data from the display card (10) and the overlay data gener- ated by the computer system (12). The CPU of the computer system is not required to manipulate the image pixels. Consequently, the CPU only has to process the overlay information, a small part of the overall information content displayed on the display monitors (13, 14), and hence the speed of image generation is improved.
Blume David
Di Stefano Charles
Fox Christopher M.
Mcreynolds John
Youngman Eric
Loral Aerospace Corporation
Sim & Mcburney
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