Backgrounds
The SNES has 8 background modes, two of which have major variations. The modes are selected by bits 0-2 of register $2105
.
Mode # Colors for BG
1 2 3 4
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0 4 4 4 4
1 16 16 4 -
2 16 16 - -
3 256 16 - -
4 256 4 - -
5 16 4 - -
6 16 -