Appeal No. 1997-0400
Application No. 08/080,735
BACKGROUND
The appellants’ invention relates to palette devices with a true color mode. The
invention selects between the display of data from a look-up table or from direct display
data without being processed by a look-up table. An understanding of the invention can be
derived from a reading of exemplary claim 34, which is reproduced below.
34. A palette device controllable by a digital computer with a video
memory to produce signals representing color for a color display device,
said palette device comprising:
a multiple-bit input latch for storing multibit color codes from the video
memory, each multibit color code consisting of a first predetermined plurality
of minority bits and a second predetermined plurality of majority bits, said
second predetermined plurality being greater than said first predetermined
plurality;
a look-up table memory connected to said multiple-bit input latch for
supplying color data words in response to color codes comprising minority
bits recalled from said multiple-bit input latch;
a digital to analog converter responsive to color data words to
produce an analog color signal;
a detector circuit connected to said minority bits of said multiple-bit
input latch for detecting a predetermined condition on said minority bits
stored in said multiple-bit input latch; and
selection circuitry having inputs connected to receive majority bits
from said multiple-bit input latch and also connected to receive color data
words supplied by said look-up table memory, having a control input
connected to said detector circuit and an output connected to said digital to
analog converter, said selection circuitry supplying said digital to analog
converter either with a color data word supplied by said look-up table
memory when said detector circuit fails to detect said predetermined
condition or with a color data word comprised of the majority bits from the
2
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