Palettes in a nutshell

• There are 4 palettes, two per display.
• Sprites get one palette, and background layers another.
• Each palette has 256 halfword entries.
• Each entry contains 5 bits of red, 5 bits of green, 5 bits of blue, and an unused bit.
• PALETTE_BG1 is at 0x05000000 (background palette for 2D core A)
• PALETTE_FG1 is at 0x05000200 (sprite palette for 2D core A)
• PALETTE_BG2 is at 0x05000400 (background palette for 2D core B)
• PALETTE_FG2 is at 0x05000600 (sprite palette for 2D core B)

Color structure