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The EF9369 is a color palette manager. It decodes a 16 color palette to 12-bit RGB (4 bits red, 4 bits gree, 4 bits blue).

Color values

Value	Level
0	0.8
1	1.18
2	1.28
3	1.36
4	1.42
5	1.47
6	1.52
7	1.56
8	1.60
9	1.63
A	1.66
B	1.69
C	1.72
D	1.75
E	1.78
F	1.80

The chip compensates for the expected cathodic ray tube gamma curve. This compensation is quite strong, and even more so on recent LCD displays, which have a close to linear gamma curve. As a result, colors are brighter than you think, and there is a big gap between levels 0 (black) and 1.