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YI Memory Map

Displaying 50 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)