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YI Memory Map

Displaying 75 out of 586 addresses.

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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.
$0280BD 108 bytes Sprite Palette Falling wall palettes. Palettes are stored in individual colours, in the order blue value, green value and red value. It is indexed by the table at $0280B7 which in turn is indexed by the sprite palette and is copied to $70404A.
$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)
$09835F 477 bytes Super FX Super FX routine which draws Yoshi (copies tiles to OAM and sets the graphics pointer). It also draws Yoshi's tongue.
$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.

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