YI Memory Map - SMW Central

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Address
Hexadecimal number for a partial address. 6-digit number for a full address. Use - to denote a range. Use , to list more than one address.

Length

Type
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Description
Separate each individual keyword with spaces. Surround a phrase with quotes to look for the exact phrase, or with / to use a PCRE regular expression. Prepend with - to exclude a keyword or phrase, with + to require a whole word or phrase, or with -+ to exclude a whole word or phrase. ? matches any character, * matches any amount of characters.

$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.

$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)