SFROM File Format

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An SFROM file contains the code and data of an emulated SNES game. It has the following structure:

• Unknown
• Configuration info
• Footer

Configuration Info

This section contains an array of configuration chunks. Every configuration chunk starts with a single character that indicates its type, which is followed by the configuration value.

If the character is lowercase, the value contains exactly one byte:

Offset	Size	Description
0x0	1	Chunk type (a-z)
0x1	1	Value

If it is uppercase, the next three bytes specify the size of the value:

Offset	Size	Description
0x0	1	Chunk type (A-Z)
0x1	3	Value size (N)
0x4	N	Value

The following configuration types are valid:

Type	Description
A	Unknown
D	Unknown
G	Game id
P	Unknown
S	Unknown
U	Unknown
a	Unknown
c	Unknown
e	Unknown
h	Unknown
j	Unknown
m	Unknown
p	Unknown
r	Unknown
t	Unknown
v	Audio volume

Game IDs

The game id is used to load game-specific patches. The following game ids are currently known:

ID	Game
1003	Super Ghouls'n Ghosts
1011	Super Mario World
1016	Mario's Super Picross
1018	F-Zero
101D	The Legend of Zelda: A Link to the Past
1022	Donkey Kong Country
1040	Super Metroid
1058	Kirby's Dream Course
105D	Donkey Kong Country 2: Diddy's Kong Quest
1068	Breath of Fire II
106E	Earthbound
1074	Panel de Pon
1077	Donkey Kong Country 3: Dixie Kong's Double Trouble
107A	Kirby's Avalanche
109F	Kirby Super Star
10A2	Kirby's Dream Land 3
10A9	Super Punch-Out
10BA	Pilotwings
10BD	Super Mario Kart
10C7	Super Earth Defense Force
10CA	Rival Turf
10CD	Brawl Brothers
10D0	The Ignition Factor
10E7	Super Mario All-Stars
10FB	Wild Guns
1107	Natsume Championship Wrestling
112F	Pop'n TwinBee
1144	Breath of Fire
1146	Demon's Crest
123B	Star Fox
123D	Super Mario World 2: Yoshi's Island
123E	Stunt Race FX
1241	Super Soccer
1245	Star Fox 2
1247	Super Puyo Puyo 2
124A	Smash Tennis
1262	Joe & Mac 2: Lost in the Tropics
1266	Super Tennis
126E	Fighter's History
1270	Caveman Ninja
1276	Doomsday Warrior
1278	Operation Logic Bomb
127A	Psycho Dream
127C	The Peace Keepers
127E	Tuff E Nuff
1280	Super Valid IV
1282	Congo's Caper
1284	Magical Drop 2
12A2	Prehistorik Man
12A4	Earthworm Jim 2
12A6	Claymates
12B0	Super Baseball Simulator 1.000
12D2	Bombuzal
12D6	Spanky's Quest
12D8	Jelly Boy

Footer

Offset	Size	Description
0x0	4	Configuration info size
0x4	4	Magic number (Can1)