MB86290A Datasheet, PDF (41/184 Pages) Fujitsu Component Limited. – Graphics Controller Hardware Specifications

Texture/tiling pattern (direct color)
This is color data described in the direct color mode (RGB 5 bits,
respectively). The MSB is an alpha bit used for the transparency effect of
alpha blending.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
A
R
G
B
Tiling pattern (indirect color)
This is a color index code in 8 bits.
76543210
Color Code
Cursor pattern
This is a color index code in 8 bits.
76543210
Color Code
41