YI Memory Map
Displaying 50 out of 586 addresses.
View: moderated | waiting (23)
| 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) | |