Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1990-06-27
1994-05-03
Herndon, Heather R.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395164, 345199, G06F 1562
Patent
active
053095510
ABSTRACT:
A palette device for use with a digital computer that produces a video control signal and color code signals for a first bus and where the digital computer has a graphics coprocessor that produces a video control signal and color code signals for a second bus. The palette device includes an input register for holding respective bits from separate sets of input lines including a first set of input lines for signals representing color codes on the first bus and a second set of input lines for signals representing color codes on the second bus. The palette device further has a look-up table memory for supplying color data words in response to color codes from the input register, and a selector circuit connected between the input register and the look-up table memory. The selector circuit is externally controllable to transfer selected color codes from the selected first or second bus to said look-up table memory and to select a video control signal for output depending on the selected bus. Computer graphics systems, printer systems and methods are also disclosed.
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Asal Michael D.
Guttag Karl M.
Nye Jeffrey L.
Donaldson Richard L.
Herndon Heather R.
Kesterson James C.
Marshall, Jr. Robert D.
Texas Instruments Incorporated
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