YI Memory Map - SMW Central

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SRAM Address	Length	Type	Description	Details
$700172	2 bytes	Misc.	For ice and fire melons: X position of where flame/ice was spat For watermelon seeds: # of seeds spat in succession during holding Y (loops from 0 to 6 then back to 0)
$700174	2 bytes	Misc.	Ice and fire melons: Y position of where ice/flame was spat
$70017A	1 byte	Cutscene	The value in it is stored in Controller Data 1 during cutscenes.
$70017B	1 byte	Cutscene	The value in it is stored in Controller Data 2 during cutscenes.
$70017C	1 byte	Cutscene	The value in it is stored in Controller Data 1, one frame during cutscenes.
$70017D	1 byte	Cutscene	The value in it is stored in Controller Data 2, one frame during cutscenes.
$70017E	2 bytes	Player Physics	Car Yoshi: left wheel X position All other transformations: Rotation angle (mario low byte only)
$700180	2 bytes	Player Physics	Transformation value: Helicopter: Rotation speed when hit. Starts at $1000, decreases by $20 each frame until $0700 Submarine: Rotation angle when hit. Starts at $0000, increments by $10 each frame until $0800 Train: Size counter when entering track. Starts at $00FF, decrements one per frame until $0070 Car: X-position in pixels Super Baby Mario: $0007 when running on ground allowing for vertical climb Mole: Orientation of vehicle: $0000: 0° $0001: 90° $0002: 180° $0003: 270° Ski Yoshi: Snowball State, starts at $0080 when hit and increases by 2 every frame on the ground until value reaches $0100
$700182	2 bytes	Player Physics	Car Yoshi: right wheel X position Helicopter: Animation frame (0-3) (turning around)
$700184	2 bytes	Player Physics	Car Yoshi left wheel Y position
$700188	2 bytes	Player Physics	Car Yoshi right wheel Y position
$700198	2 bytes	Player Physics	Transformation value: Car: Y position of player / car Super Baby Mario: Y scale, normalized at $0100
$7001AE	2 bytes	Flag	Disables control & animation of Yoshi
$7001B0	2 bytes	Flag	Disables updating & animation of sprites
$7001B2	2 bytes	Misc.	Baby Mario state info (set up like bit flags but never more than 1 on simultaneously): $0000: Off of Yoshi, floating & crying $2000: Super Baby Mario / Bonus challenge Mario $4000: Seized by toadies/bandits/frogs $8000: Riding Yoshi
$7001B4	2 bytes	Flag	Currently on a platform sprite (Chomp rock, Hint block, rotating platforms, etc.) - also counts the total number currently standing on
$7001B6	2 bytes	Sprite Number	Slot of platform sprite that Yoshi is on. Does not apply to every platform sprite, for example it does for some moving sprites such as Pinwheels, Chomp Rock, Poochy, Flatbed Ferries, Lakitu clouds etc., but not for Hint Blocks, Donut Lifts etc.
$7001B8	2 bytes	Flag	Previous frame's value of $7001B4
$7001BC	2 bytes	Sprite Physics	Where the water line starts for sprite physics Only used for BG3 tilesets $13 (value $07B0) and $1D ($0700) Value is left at $4000 when disabled This doesn't affect regular water objects, only hardcoded water for certain BG3 tilesets. $ssyy ss = vertical screen number yy = Y-position of water line
$7001C6	2 bytes	Misc.	Timer/index into camera Y offset table for small camera shaking (used by ground pounds, big egg ground impact, etc.)
$7001C8	2 bytes	Misc.	Timer/index into camera Y offset table for large camera shaking (used for falling chain chomps, chasing chain chomp hitting wall, etc.)
$7001CA	2 bytes	Layer 1 Tilemap	Special Offset-By-Tile Modes $00: None (normal) $01: Level Mode 2 (1-7, 6-4, 6-3) $03: When Fuzzied $05: Unused
$7001D0	2 bytes	Misc.	Timer for Yoshi's turning pose. Starts at #$0004 when you change direction while in movement (ground or air), remains with this value for a brief time if you keep holding this direction until it starts decrementing each frame.
$7001D2	2 bytes	Misc.	Timer for each walking (not running) animation frame.
$7001D4	2 bytes	Misc.	Timer for each animation frame of the landing, start of falling and fluttering.
$7001D6	2 bytes	Misc.	Invincibility timer (starts at $00A0 on hit and decrements)
$7001D8	2 bytes	Misc.	Timer for each Yoshi idle animation state.
$7001DC	2 bytes	Misc.	Timer for bopping head in solid blocks animation. It's the exact time with zero y speed during the bop.
$7001DE	2 bytes	Misc.	Timer for ground pounding animation.
$7001E0	2 bytes	Misc.	Timer for mouth/tongue related animations.
$7001E2	2 bytes	Misc.	Egg throwing state timer
$7001EA	2 bytes	Timer	Particle generation timer for mud & snowy trees, initially set to $08 and zero means spawn in (if conditions met)
$7001EE	2 bytes	Misc.	Timer for sprite in Yoshi's mouth to be automatically swallowed. Starts off at $04B0 upon sprite entering mouth (even for inedible ones like the shell), counts down to $0000
$7001F4	2 bytes	Misc.	Transformation timer, counts down
$700200	2048 bytes	Misc.	OAM buffer. Split into 256 4-word entries, each one representing a possible entry in OAM: Word 1: Screen-relative X coordinate (low byte copied into byte 1 of OAM low table mirror entry) Word 2: Screen-relative Y coordinate (low byte copied into byte 2 of OAM low table mirror entry) Word 3: Copied into OAM low table mirror entry bytes 3 & 4 (see OAM low table mirror $700A00 for details) Word 4: -p----sx------sx, p = priority (0=forward, 1=reverse), s = size, x = 9th x bit (low byte copied into high table buffer entry) NOTE: First 16 sprites are reserved for high priority items such as text and these are NOT handled by this buffer, thus copying begins at $700A40 for low table mirror and $700C30 for high table buffer. Copying will continue until either the last entry of the OAM low table mirror ($700BFC) or the last entry of this buffer ($7009F8).
$700244	2 bytes	Player Physics	Yoshi's X subpixel position on a spinning wooden platform, unaffected by the rotation.
$700246	2 bytes	Player Physics	Yoshi's X position on a spinning wooden platform, unaffected by the rotation.
$700A00	512 bytes	Misc.	OAM low table mirror. 4-byte entries with format xxxxxxxx yyyyyyyy tttttttt yxppccct (x = X coordinate, y = Y coordinate, t = tile number, c = palette 0-7, p = priority, x&y = flip)
$700C00	32 bytes	Misc.	OAM high table mirror. 2 bits per entry, most significant X and size flag.
$700C20	128 bytes	Misc.	OAM high table buffer. Each entry is one byte which corresponds with one OAM entry. The 2 lowest bits of the byte get copied into the high table mirror ($700C00-$700C1F) and shifted into the correct spot for the entry.
$700CA0	2 bytes	Map	Island angle. Only low byte is used.
$700CAA	128 bytes	Misc.	Screen ID table: maps raw screen # ($00-$7F) to screen ID ($00-$3F). The sign bit on indicates "empty" screen (has no object at all), or camera is unable to scroll into the screen due extended object $FE, or tiles are erased in that screen by extended object $FF.
$700DAA	64 bytes	Misc.	BG1 - Left half of newest column spawned in, 32 SNES VRAM tilemap words, stored as a column but DMA'd to VRAM with increments of $40 to get to the next row each write and line up properly
$700DEA	64 bytes	Misc.	BG1 - Right half of newest column spawned in, 32 SNES VRAM tilemap words, stored as a column but DMA'd to VRAM with increments of $40 to get to the next row each write and line up properly
$700E2A	68 bytes	Misc.	BG1 - Top half of newest row spawned in, 34 SNES VRAM tilemap words, split into two separate DMA's - one for tilemap 1, one for tilemap 2
$700E6E	68 bytes	Misc.	BG1 - Bottom half of newest row spawned in, 34 SNES VRAM tilemap words, split into two separate DMA's - one for tilemap 1, one for tilemap 2
$700EB6	1 byte	Misc.	Spriteset file # 1 ($F7 index)
$700EB7	1 byte	Misc.	Spriteset file # 2 ($F8 index)
$700EB8	1 byte	Misc.	Spriteset file # 3 ($F9 index)
$700EB9	1 byte	Misc.	Spriteset file # 4 ($FA index)
$700EBA	1 byte	Misc.	Spriteset file # 5 ($FB index)
$700EBB	1 byte	Misc.	Spriteset file # 6 ($FC index)
$700EBC	2 bytes	Misc.	Previous frame X coordinate of sprite currently being processed
$700EBE	2 bytes	Misc.	Previous frame Y coordinate of sprite currently being processed
$700EC0	64 bytes	Sprite Table	16 4-byte entries, one ambient sprite per: Word 1: Flag for whether it exists currently or not (usually $000E for active) Word 2: $0000
$700F00	96 bytes	Sprite Table	24 4-byte entries, one sprite per: Word 1: Sprite state $0000: nonexistent (used for skipping processing) $0002: newly spawned $0004: same as $02? $0006: pop sprite (turn into other sprite based on this table) $0008: in yoshi's tongue and/or mouth $000A: riding Yoshi $000C: colliding $000E: yoshi head bop $0010: active / alive $0012: burning to death from lava/fire melon Word 2: Angle of ground that the sprite is walking on
$700F60	64 bytes	Sprite Table	16 4-byte entries, one ambient sprite per: bitwise flags: Byte 1: ???????? Byte 2: ?? Byte 3: terrain collision flags Byte 4: ??
$700FA0	96 bytes	Sprite Table	24 4-byte entries, one sprite per: Byte 1: tc?hhhhh t = Can be tongued (into mouth) c = Tongue collision is ignored h = hitbox setting (index into hitbox tables) Byte 2: ?? Byte 3: terrain collision flags Byte 4: ??
$701000	64 bytes	Sprite Table	16 4-byte entries, one ambient sprite per: Byte 1: ????ddmm d = Index into despawning x,y threshold table (00 means no despawning) m = drawing method index Byte 2: Count/# of bytes taken up in OAM buffer Byte 3: Partial OAM low table mirror yx00ccc0 (c = palette 0-7, x&y = flip) Note: X-flip and Y-flip is conventionally set by facing direction Byte 4: ??
$701040	96 bytes	Sprite Table	24 4-byte entries, one sprite per: Byte 1: sf?bddmm s = automatic swallow f = can be frozen b = can be burned by flame d = Index into despawning x,y threshold table (00 means no despawning) m = drawing method index Byte 2: Count/# of bytes taken up in OAM buffer Byte 3: Partial OAM low table mirror yx00ccc0 (c = palette 0-7, x&y = flip) Note: X-flip is conventionally set by facing direction Byte 4: ??
$7010A0	64 bytes	Sprite Table	16 4-byte entries, one ambient sprite per: Ambient Sprite X coordinates, format: Byte 1: 00 Byte 2: X subpixel Byte 3: X pixel Byte 4: X screen
$7010E0	96 bytes	Sprite Table	24 4-byte entries, one sprite per: Sprite X coordinates, format: Byte 1: Sprite priority override flag (puts sprite farthest back if $40) Byte 2: X subpixel Byte 3: X pixel Byte 4: X screen
$701140	64 bytes	Sprite Table	16 4-byte entries, one ambient sprite per: Ambient Sprite Y coordinates, format: Byte 1: 00 Byte 2: Y subpixel Byte 3: Y pixel Byte 4: Y screen
$701180	96 bytes	Sprite Table	24 4-byte entries, one sprite per: Sprite Y coordinates, format: Byte 1: Index into OBJ Tiles (override) Byte 2: Y subpixel Byte 3: Y pixel Byte 4: Y screen
$7011E0	64 bytes	Sprite Table	16 2-word entries, one ambient sprite per: Word 1: X speed Word 2: Y speed
$701220	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: X speed Word 2: Y speed
$701280	64 bytes	Sprite Table	16 2-word entries, one ambient sprite per: Word 1: X delta, or pixels moved since last frame (curr X - prev X) Word 2: Y delta, or pixels moved since last frame (curr Y - prev Y)
$7012C0	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: X delta, or pixels moved since last frame (curr X - prev X) Word 2: Y delta, or pixels moved since last frame (curr Y - prev Y)
$701320	64 bytes	Sprite Table	16 2-word entries, one ambient sprite per: Word 1: Ambient sprite ID (list of valid values with their names) Word 2: Pointer to first entry within OAM buffer
$701360	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: Sprite ID (list of valid values with their names) Word 2: Pointer to first entry within OAM buffer
$7013C0	64 bytes	Sprite Table	16 2-word entries, one ambient sprite per: Word 1: Facing/direction: 00000yx0 y = Y flip x = X flip Word 2: Current animation frame
$701400	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: Facing/direction: 00000yx0 y = Y flip x = X flip Note: Y-flip conventionally set by OAM mirror Word 2: Current animation frame (High byte is used as a special flag for shyguys when spat upwards)
$701460	64 bytes	Sprite Table	16 4-byte entries, one ambient sprite per: Byte 1: Stage-wide ID (is always $FF as ambient sprites do not respawn) Byte 2: Background layer # of ambient sprite (unused?) Byte 3: Ambient Sprite Prioirty (0-7) - higher means further back - $FF used to disable drawing Byte 4: 00 (unused)
$7014A0	96 bytes	Sprite Table	24 4-byte entries, one sprite per: Byte 1: Stage-wide ID ($FF means no respawn) Byte 2: Background layer # of sprite Byte 3: Sprite Prioirty (0-7) - higher means further back - $FF used to disable drawing Byte 4: 00 (unused)
$701500	64 bytes	Sprite Table	16 2-word entries, one ambient sprite per: Word 1: X acceleration (e.g. gravity, friction) Word 2: Y acceleration
$701540	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: X acceleration (e.g. gravity, friction) Word 2: Y acceleration
$7015A0	64 bytes	Sprite Table	16 2-word entries, one ambient sprite per: Word 1: X acceleration ceiling (max speed for acceleration to apply) Word 2: Y acceleration ceiling
$7015E0	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: X acceleration ceiling (max speed for acceleration to apply) Word 2: Y acceleration ceiling
$701640	64 bytes	Sprite Table	16 2-word entries, one ambient sprite per: Word 1: X coordinate relative to camera Word 2: Y coordinate relative to camera
$701680	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: X coordinate relative to camera Word 2: Y coordinate relative to camera
$7016E0	64 bytes	Sprite Table	16 2-word entries, one ambient sprite per: Word 1: vertical terrain collision offset in pixels (signed) Word 2: Index into reserved dynamic tiles table, often used for SuperFX graphics ($FFFF means disabled) (unused for ambient sprites?)
$701720	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: vertical terrain collision offset in pixels (signed) Word 2: Index into reserved dynamic tiles table, often used for SuperFX graphics ($FFFF means disabled)
$701780	64 bytes	Sprite Table	16 2-byte and 1-word entries, one ambient sprite per: Byte 1: 00 Byte 2: Timer, used for whatever that sprite needs. (unused in game?) Word 2: Timer, zero removes ambient sprite (every sprite?). Often used for duration of each animation.
$7017C0	96 bytes	Sprite Table	24 4-byte entries, one sprite per: Yoshi collision information: Byte 1: ?? Byte 2: Timer, used for whatever that sprite needs. Only sprite timer active during pause flags. (unused in game?) Byte 3: $00: Yoshi is to the left of the sprite; $02: Yoshi is to the right of the sprite Byte 4: $00: Yoshi is above the sprite; $02: Yoshi is below the sprite
$701820	64 bytes	ASM	16 4-byte entries, one ambient sprite per: Byte 1: ???????G (on ground flag) Byte 2: ?? Byte 3: init $FF, ? Byte 4: init $1F, ?
$701860	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: Terrain collision flags, ???????? ????LRUD, high byte is unused; L = Left R = Right U = Up D = Down Word 2: Lava and water collision flag ???????? ??LW??? L = Lava W = Water
$7018C0	64 bytes	Sprite Table	Wildcard table; 4 bytes per ambient sprite to be used as each one pleases (never initialized or cleared on spawn)
$701900	96 bytes	Sprite Table	Wildcard table; 4 bytes per sprite to be used as each one pleases.
$701970	2 bytes	Misc.	Random number generator (RNG) address, adds horizontal & vertical scanlines per sprite per frame
$701972	2 bytes	Misc.	Sprite slot # of sprite being currently processed
$701974	2 bytes	Timer	Frame counter, only counts when sprites are being processed - includes gamemodes $07, $0C (only in level fade-in), $0E, $0F, $10 (inside level, not score screen), $15, $39 Controls tileset animation
$701976	96 bytes	Sprite Table	Wildcard table; 4 bytes per sprite to be used as each one pleases. Commonly used for AI state, graphical state, or other purposes.
$7019D6	96 bytes	Sprite Table	Wildcard table; 4 bytes per sprite to be used as each one pleases. Common usages: Byte 1: AI state Byte 2: Index for which Super FX graphic/animation frame Byte 3: "Next" animation frame Byte 4: Custom per sprite
$701A36	96 bytes	Sprite Table	24 2-word entries, one sprite per: Super FX morphing values to be used as each Super FX sprite needs, most common is scale then rotation.
$701A96	96 bytes	Sprite Table	24 2-word entries, one sprite per: Each word is a timer, used for whatever that sprite needs. Common uses are AI and skeletal animations.
$701AF6	96 bytes	Sprite Table	24 2-word entries, one sprite per: Each word is a timer, used for whatever that sprite needs. (Additional general purpose timers if needed)
$701B56	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: X offset for hitbox center Word 2: Y offset for hitbox center
$701BB6	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: Width of hitbox from center (both sides) Word 2: Height of hitbox from center (top & bottom)
$701C16	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: X distance from Yoshi (+ means to the right of Yoshi) Word 2: Y distance from Yoshi (+ means below Yoshi)
$701C76	96 bytes	Sprite Table	24 2-word entries, one sprite per: Word 1: On collision with another sprite, X delta from that sprite (this X - that X) Word 2: On collision with another sprite, Y delta from that sprite (this Y - that Y)

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