Wonder Boy III: Monster Lair (Genesis)/Notes

The following article is a Notes Page for Wonder Boy III: Monster Lair (Genesis).

Gfx format

Gfx data (tiles) are organized by levels (0 to 11). Pointers to each level data are stored from 0x43000 to 0x4302c. Then, for each level, gfx are stored by chunk.

For example, pointer to level 3 chunks is 0x432cc (read at 0x4300c). Then, at 0x432cc, there are pointers to 4 chunks : 0x00000000 (null chunk), 0x432e0, 0x43188, 0x433aa, 0x433aa.

Each chunk is a list of 16 bytes entries, terminated by a 0000 :

• 1 word: number of tiles - 1
• 1 long: pointer to actual data
• 1 word: 1 if gfx uses color indices 0 to 7 (x = 0 in the following), -1 if gfx uses color indices 8 to 15 (x = 1 in the following).

Actual tile data is stored in 3bpp interleaved format:

• 1 byte: a7 a6 a5 a4 a3 a2 a1 a0
• 1 byte: b7 b6 b5 b4 b3 b2 b1 b0
• 1 byte: c7 c6 c5 c4 c3 c2 c1 c0

gives :

• 1 byte (2 pixels): (x a7 b7 c7) (x a6 b6 c6)
• 1 byte (2 pixels): (x a5 b5 c5) (x a4 b4 c4)
• 1 byte (2 pixels): (x a3 b3 c3) (x a2 b2 c2)
• 1 byte (2 pixels): (x a1 b1 c1) (x a0 b0 c0)

	Chunk 0	Chunk 1	Chunk 2	Chunk 3	Chunk 4	Chunk 5
Level 0	0x4303e	0x43060	0x43092
Level 1	0x430d6	0x43188	0x43192	0x43192
Level 2	00000000	0x431e0	0x43188	0x4328a	0x4328a
Level 3	00000000	0x432e0	0x43188	0x433aa	0x433aa
Level 4	00000000	0x433fc	0x4347e	0x43188	0x43188	0x434a8
Level 5	00000000	0x434f6	0x43188	0x43598	0x43598
Level 6	00000000	0x435e6	0x43188	0x43698	0x43698
Level 7	00000000	0x436e6	0x43188	0x43790	0x43790
Level 8	00000000	0x437ee	0x43188	0x438c0	0x438c0
Level 9	00000000	0x43916	0x439a8	0x439b2	0x439b2
Level 10	00000000	0x439fe
Level 11	0x43034

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