Graphics computer system having a second palette shadowing data

Details Graphics computer system having a second palette shadowing data Graphics computer system having a second palette shadowing data

1995-06-07

1997-06-03

Lane, Jack A.

395507, 395515, 395405, G06T 1560

Patent

active

056363354

ABSTRACT:
A graphics computer system including a host computer and a graphics processor. The host computer has a host data bus and a host address bus. A first video memory stores color codes corresponding to a display. The first video memory is connected to the host computer permitting it to specify the color codes. A first palette connected to the first video memory has a first look-up table memory for recalling color data words corresponding to color codes received from the first video memory. The first palette is connected to the host computer permitting it to specify the color data words stored in the first look-up table memory. The graphics processor has a local data bus and a local address bus. A second video memory stores color codes corresponding to a display, the graphics processor specifying the color codes stored in the second video memory. A second palette connected to the second video memory has a second look-up table memory. The second palette is connected to the graphics processor permitting it to specify the color data words stored in the second look-up table memory. An interface circuit connects to the host data bus, the host address bus and the second palette. The interface circuit writes data received from the host data bus into the second palette upon detecting predetermined addresses on the host address bus. This causes at least a portion of the second palette to store identical data as stored in corresponding locations of the first palette.

REFERENCES:
patent: 5270687 (1993-12-01), Killebrew et al.
patent: 5309551 (1994-05-01), Guttag et al.
patent: 5327159 (1994-07-01), Van Aken et al.

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