Sprite graphics format
The 16x16 pixels sprite tiles are divided in 4 8x8 blocks. Each row of these 8x8 blocks are stored backwards in a 4bit planar organization.
- On cart systems, bitplanes 0 and 1 go in the odd C ROMs (C1, C3...), while bitplanes 2 and 3 go in the even ones (C2, C4...).
- On CD systems, bitplanes follow a 1/0/3/2 pattern.
