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10. Preset
Upon RESET. The same color scheme as the IBM PC is preset.
Using three bits apiece for R, G, and B, 512 colors are possible. Of those 256 colors, 16 colors may be saved in the
color palette. Bits I, R, G, and B have meanings in IBM PC mode, however, generally the color palette selection
signals do not have meaning.
I R G B
R2 R1 RO G2 G1 GO B2 B1 BO
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
Black
Blue
Green
Cyan
Red
Magenta
Brown
White
Gray
Light Blue
Light Green
Light Cyan
Light Red
Light Magenta
Yellow
White (High Intensity)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
0
0
1
0
0
1
0
0
1
0
0
0
0
1
0
0
1
0
0
1
0
0
0
0
0
0
1
1
0
0
0
0
1
1
0
0
0
0
0
0
0
1
1
0
1
1
0
1
0
1
0
0
0
0
0
0
1
1
0
0
0
0
1
1
0
1
1
0
1
1
0
0
0
0
1
1
1
1
1
1
1
1
1
3DFH (Display Page REGISTER)
This is a 3 bit write-only register. It can't be read and its address is hex "3DFH" of the four least significant bits of
the I/O address with a "0" *IOSEL signal.
When the Page Mode is enabled, this register selects a page from four 16KB display pages in a 64K bytes space.
The Page Mode is not supported on the static RAM system configuration due to pin number limit, but it becomes
available for use adding by external circuits.
Other registers function are as same as 6845 registers.
F-2
1
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