Commodore Amiga A1000, Hardware Reference Manual

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Figure 4-5: (Sprite Color Definition)
The 0s and 1s in the two data words that define each line of a sprite in the data structure
form a binary number. This binary number points to one of the four color registers
assigned to that particular sprite DMA channel. The eight sprites use system color
registers 16 - 31. For purposes of color selection, the eight sprites are organized into pairs
and each pair uses four of the color registers as shown in Figure 4-6.
NOTE
The color value of the first register in each group of four registers is ignored by sprites.
When the sprite bits select this register, the "transparent" value is used.
- Sprite Hardware 99 -