Jul -- SM64 Hacking (Archive): Save file format info

MarIO0
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Posted on 09-03-09 02:25:13 PM (last edited by MarIO0 at 09-03-09 11:27 AM)

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Probably not useful, but it may be interesting to test some things.



Structure of the EEPROM dump (512 bytes)

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----------------------------------------

56 bytes - Save Data 1

56 bytes - Save Data 1 (backup)

56 bytes - Save Data 2

56 bytes - Save Data 2 (backup)

56 bytes - Save Data 3

56 bytes - Save Data 3 (backup)

56 bytes - Save Data 4

56 bytes - Save Data 4 (backup)

64 bytes - Padding / random data?


The game seems to check if the checksum of the main save data is valid, if it isn't, then it tries to load the backup, and if it's also invalid, it deletes the save data.


Save Data (56 bytes each)

-------------------------

-------------------------


Settings

--------

Byte 9 - Bit 1: Cap stolen by snowman

Byte 9 - Bit 2: Cap stolen by bird

Byte 9 - Bit 3: Cap stolen by monkey

Byte 9 - Bit 5: 3rd floor (50 star) door

Byte 10 - Bit 1: Unknown. Seems to be set when opening the DDR/BitFS room?

Byte 10 - Bit 2: Water level outside the castle

Byte 10 - Bit 3: Princess secret slide door

Byte 10 - Bit 4: Whomp's Fortress door

Byte 10 - Bit 5: Cool, Cool Mountain door

Byte 10 - Bit 6: Jolly Roger Bay door

Byte 10 - Bit 7: Bowser in the dark world (8 star) door

Byte 10 - Bit 8: Bowser in the fire sea (30 star) door

Byte 11 - Bit 1: Valid game (Game is empty otherwise)

Byte 11 - Bit 2: Wing cap switch

Byte 11 - Bit 3: Metal cap switch

Byte 11 - Bit 4: Vanish cap switch

Byte 11 - Bit 5: Bowser in the dark world key (disabled when the door is opened)

Byte 11 - Bit 6: Bowser in the fire sea key (disabled when the door is opened)

Byte 11 - Bit 7: Basement door open

Byte 11 - Bit 8: 2nd floor door open


Stars

-----

Byte n: Bit 1/2/3/4/5/6/7 - Stars 1/2/3/4/5/6/7

Byte n + 1: Bit 8 - Cannon


Bob-omb Battlefield: n = 12

Whomp's Fortress: n = 13

Jolly Roger Bay: n = 14

Cool, Cool mountain: n = 15

Big Boo's Haunt: n = 16

Hazy Maze Cave: n = 17

Lethal Lava Land: n = 18

Shifting Sand Land: n = 19

Dire, Dire Docks: n = 20

Slowman's Land: n = 21

Wet-Dry World: n = 22

Tall, Tall Mountain: n = 23

Tiny-Huge Island: n = 24

Tick Tock Clock: n = 25

Rainbow Ride: n = 26


Secret stars

------------

Byte 8: Bit 1 - Toad near Hazy Maze Cave

Byte 8: Bit 2 - Toad near Tall, Tall Mountain

Byte 8: Bit 3 - Toad near Tick Tock Clock

Byte 8: Bit 4 - MIPS 1

Byte 8: Bit 5 - MIPS 2

Byte 27: Bit 1 - Bowser in the dark world*

Byte 28: Bit 1 - Bowser in the fire sea

Byte 29: Bit 1 - Bowser in the sky

Byte 30: Bit 1 - Princess slide

Byte 30: Bit 2 - Princess slide 21'

Byte 31: Bit 1 - Metal cap star

Byte 32: Bit 1 - Wing cap star

Byte 33: Bit 1 - Vanish cap star

Byte 34: Bit 1 - Flying special level

Byte 35: Bit 8 - Flying special level (cannon)

Byte 35: Bit 1 - Aquarium


* = Uses the same byte as the Rainbow Ride cannon!


"Unused" stars

--------------

All the bytes of the stars (8 + 12 to 35), plus byte 36, can be used to store stars. The stars should be saved in the low 7 bits, and the high bit is used to store the cannon flag.


The maximum number of stars (in the save file) is 26 * 7 = 182.


Coins

-----

The coins are saved in:


Bob-omb Battlefield: Byte 37

Whomp's Fortress: Byte 38

Jolly Roger Bay: Byte 39

Cool, Cool mountain: Byte 40

Big Boo's Haunt: Byte 41

Hazy Maze Cave: Byte 42

Lethal Lava Land: Byte 43

Shifting Sand Land: Byte 44

Dire, Dire Docks: Byte 45

Slowman's Land: Byte 46

Wet-Dry World: Byte 47

Tall, Tall Mountain: Byte 48

Tiny-Huge Island: Byte 49

Tick Tock Clock: Byte 50

Rainbow Ride: Byte 51


Checksum

--------

52: 2 bytes - Always 0x4441?

54: 2 bytes - Checksum-16 (Sum of all bytes to a 16-bit integer) of the data (from 0 to 54).


Unknown or unused

-----------------

Bytes 0 to 7.

Some bits, probably unused.

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