YI Memory Map - SMW Central

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Tip: If you give a Muncher tile custom graphics, it will still act like a coin when a silver P-switch is active, whether it looks like a coin or not. So make sure to use ExAnimation if there's a silver P-switch in the area.

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ROM Address	Length	Type	Description	Details
$008000	85 bytes	ASM	This is the starting address for YI. This takes care of basic initialization such as disabling IRQ, HDMA, DMA, clearing the SPC ports, enabling F-blank, disabling emulation mode, disabling decimal mode, initializing the direct page, and setting up the stack, among other things.
$0080F8	56 bytes	Debug	Routine used for frame advance debug code. Enabled by tweak at $0080F7. See details for controls.	Controls
$00816A	207 bytes	Pointer	Gamemode subroutine table, 3 bytes per entry.
$008275	2 bytes	Empty	Empty (filled with FF)
$008288	35 bytes	Subroutine	JSL to copy a block of memory into RAM. Input: A: Size of the block $20-$22: RAM Destination $23-$25: DMA Source
$0082D0	19 bytes	ASM	Copies SPC program
$0083CD	34 bytes	Subroutine	Subroutine that handles fading effects.
$00841F	140 bytes	Subroutine	Music uploader subroutine
$00851C	16 bytes	Music	Item-Denial table for each music track: $01-$7F: disable items, $00 and $80-$FF: enable items
$008543	142 bytes	ASM	Music uploader controller
$0085D2	10 bytes	Subroutine	Subroutine that plays sound effects
$00B039	768 bytes	Graphics	List of sprite GFX file numbers (1 byte each) that make up each sprite set (6 files per set).
$00BFF6	10 bytes	Empty	Empty (filled with FF)
$00DE44	35 bytes	Super FX	Calls a Super FX routine, Register X = Bank, Register A = Address
$00E101	37 bytes	Subroutine	Kill Yoshi Subroutine. This one kills Yoshi as he was killed by lava. Note that this routine is copied into RAM so jump to $7EE101 if GSU is active. $00E10F is Yoshi's initial Y speed in the death animation. $00E0FD (4 bytes) is the X speed Yoshi has got in the death animation, for facing right and left.
$00E552	1024 bytes	Table	Lookup table for function y = 1/x, copied into $702200-$7025FF (Used by GSU to divide. It does not have a hardware divide so this lookup table is used instead)
$00F7A9	2039 bytes	Empty	Empty (filled with FF)
$00FFA0	5 bytes	Misc.	ROM build date and time. On a U 1.0 ROM, it's 11:19 am on July 31st, 1995
$00FFA5	11 bytes	Empty	Empty (filled with FF)
$00FFB0	2 bytes	Misc.	ROM registration: Maker code (ASCII): "01" (Nintendo)
$00FFB2	4 bytes	Misc.	ROM registration: Game code (ASCII): "YI "
$00FFB6	6 bytes	Misc.	ROM registration: reserved (all $00)
$00FFBC	1 byte	Misc.	ROM registration: Expansion FLASH Size ($00 = none)
$00FFBD	1 byte	Misc.	ROM registration: Super FX RAM size ($05 = 32KB)
$00FFBE	1 byte	Misc.	ROM registration: Special version ($00 = not special)
$00FFBF	1 byte	Misc.	ROM registration: Chipset sub-type ($00)
$00FFC0	21 bytes	Misc.	ROM header: Cartridge title (ASCII): "YOSHI'S ISLAND "
$00FFD5	1 byte	Misc.	ROM header: ROM Makeup ($20 = LoROM)
$00FFD6	1 byte	Misc.	ROM header: Chipset ($15 = ROM + SuperFX + RAM + SRAM)
$00FFD7	1 byte	Misc.	ROM header: ROM size ($0B = 2MB)
$00FFD8	1 byte	Misc.	ROM header: SRAM size
$00FFD9	1 byte	Misc.	ROM header: Region ($01 = NTSC)
$00FFDA	1 byte	Misc.	ROM header: $33 (fixed value)
$00FFDB	1 byte	Misc.	ROM header: Version ($00 = 1.0)
$00FFDC	2 bytes	Misc.	ROM header: Checksum complement (inverted bits)
$00FFDE	2 bytes	Misc.	ROM header: Checksum
$00FFE0	4 bytes	Misc.	2 unused native vectors
$00FFE4	2 bytes	Misc.	Native COP vector (unused)
$00FFE6	2 bytes	Misc.	Native BRK vector (unused)
$00FFE8	2 bytes	Misc.	Native ABORT vector (unused)
$00FFEA	2 bytes	Misc.	Native NMI vector (vblank)
$00FFEC	2 bytes	Misc.	Native RESET vector (unused)
$00FFEE	2 bytes	Misc.	Native IRQ vector
$00FFF0	4 bytes	Misc.	2 unused emulation vectors
$00FFF4	2 bytes	Misc.	Emulation COP vector (unused)
$00FFF6	2 bytes	Misc.	Emulation BRK vector (unused)
$00FFF8	2 bytes	Misc.	Emulation ABORT vector (unused)
$00FFFA	2 bytes	Misc.	Emulation NMI vector (unused)
$00FFFC	2 bytes	Misc.	Emulation RESET vector
$00FFFE	2 bytes	Misc.	Emulation IRQ vector (unused)
$028000	72 bytes	Sprite Palette	Yoshi colors used in-level. Arranged by translevel number.
$02FFD7	41 bytes	Empty	Empty (filled with FF)
$038000	1326 bytes	Pointer	Long pointers to sprite init routines in sprite ID order ($000 - $1B9)
$03852E	1326 bytes	Pointer	Long pointers to sprite main routines in sprite ID order ($000 - $1B9)
$038A5C	1326 bytes	Pointer	Long pointers to sprite head bop routines in sprite ID order ($000 - $1B9)
$038F8A	1326 bytes	Pointer	Long pointers to sprite riding Yoshi routines in sprite ID order ($000 - $1B9)
$03A364	300 bytes	Subroutine	Subroutine that spawns sprites
$03FEEE	274 bytes	Empty	Empty (filled with FF)
$0489B8	8 bytes	Sprite Palette	Shy Guy Colors (Green, Red, Yellow, Pink)
$04AC9C	29 bytes	Subroutine	Kill Yoshi Subroutine. This one kills Yoshi as he was killed by a spike.
$05C6FD	16 bytes	Misc.	Table of '?' bucket rotation effects
$05FFC4	60 bytes	Empty	Empty (filled with FF)
$06FEAA	342 bytes	Empty	Empty (filled with FF)
$07FF47	185 bytes	Empty	Empty (filled with FF)
$089FD0	48 bytes	Empty	Empty (filled with 01)
$09AF70	206 bytes	Empty	Empty (filled with 01)
$09EDCE	624 bytes	Empty	Empty (filled with 01)
$09F18F	687 bytes	Empty	Empty (filled with 01)
$0AEC2B	4 bytes	Player Physics	Yoshi max speed for acceleration to apply, for right and left.
$0B9787	121 bytes	Empty	Empty (filled with 01)
$0BF3B7	3145 bytes	Empty	Empty (filled with FF)
$0CDACA	24 bytes	Sprite Palette	Color of Kamek's first magic spell; 2 bytes per boss battle.
$0CDAE2	24 bytes	Sprite Palette	Color of Kamek's second magic spell; 2 bytes per boss battle.
$0CDAFA	12 bytes	Music	Music value used for each boss battle: $0A is x-4 boss music (or for level header music setting 7 or 8, $0A becomes the longer intro used in piranha & raven), and $0C is x-8 boss music
$0CFF69	151 bytes	Empty	Empty (filled with FF)
$0DFC83	893 bytes	Empty	Empty (filled with FF)
$0EA131	7 bytes	Subroutine	Barney Bubble init subroutine
$0EFF82	126 bytes	Empty	Empty (filled with FF)
$0FE056	6058 bytes	Empty	Empty (filled with FF)
$0FFC80	896 bytes	Misc. Tilemap	Tilemap for the Title Screen logo
$108B05	16 bytes	Level Data	Table (one byte entries): The number of bits to copy for each piece of variable-sized header information, in level header order. The final $00 marks the end. Used by $108B15.
$108B15	72 bytes	Subroutine	Level header decompression routine: copies variable-sized pieces of header data into separate addresses in RAM starting at $7E0134
$11B0FB	4 bytes	Bandit Mini-Game	Table of distances that the Gather Coins cannon rotates
$11B0FF	4 bytes	Bandit Mini-Game	Table of distances that the Gather Coins cannon and platform will move along the white track
$11B103	4 bytes	Bandit Mini-Game	Table of speeds that the Gather Coins cannon rotates
$15FFD3	45 bytes	Empty	Empty (filled with FF)
$1681C7	766 bytes	Level Data	Level $00: object data
$17B781	384 bytes	Map	X-coordinates for checkpoints along Yoshi's walking path after beating a level; 8 bytes per level
$17B901	384 bytes	Map	Y-coordinates for checkpoints along Yoshi's walking path after beating a level; 8 bytes per level
$17BDAE	16 bytes	Map	X-coordinates of each Yoshi on the world 1 map
$17BDBE	16 bytes	Map	X-coordinates of each Yoshi on the world 2 map
$17BDCE	16 bytes	Map	X-coordinates of each Yoshi on the world 3 map
$17BDDE	16 bytes	Map	X-coordinates of each Yoshi on the world 4 map
$17BDEE	16 bytes	Map	X-coordinates of each Yoshi on the world 5 map
$17BDFE	16 bytes	Map	X-coordinates of each Yoshi on the world 6 map
$17BE0E	16 bytes	Map	Y-coordinates of each Yoshi on the world 1 map
$17BE1E	16 bytes	Map	Y-coordinates of each Yoshi on the world 2 map
$17BE2E	16 bytes	Map	Y-coordinates of each Yoshi on the world 3 map
$17BE3E	16 bytes	Map	Y-coordinates of each Yoshi on the world 4 map
$17BE4E	16 bytes	Map	Y-coordinates of each Yoshi on the world 5 map

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