YI Memory Map

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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 number of characters.

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RAM Address	Length	Type	Description
$7E0000	48 bytes	Misc.	Scratch RAM, used like "registers" for various operations
$7E0030	2 bytes	Timer	Frame counter
$7E0032	3 bytes	Pointer	Pointer to level object data
$7E0035	1 byte	Controller	Controller 1 Data 1, mirror of $7E093C
$7E0036	1 byte	Controller	Controller 1 Data 2, mirror of $7E093D
$7E0037	1 byte	Controller	Controller 1 Data 1 on press/first frame, mirror of $7E093E
$7E0038	1 byte	Controller	Controller 1 Data 2 on press/first frame, mirror of $7E093F
$7E0039	2 bytes	Misc.	Layer 1 Camera X
$7E003B	2 bytes	Misc.	Layer 1 Camera Y
$7E003D	2 bytes	Misc.	Layer 2 Camera X
$7E003F	2 bytes	Misc.	Layer 2 Camera Y
$7E0041	2 bytes	Misc.	Layer 3 Camera X (also for World Map)
$7E0043	2 bytes	Misc.	Layer 3 Camera Y
$7E0045	2 bytes	Misc.	Layer 4 Camera X
$7E0047	2 bytes	Misc.	Layer 4 Camera Y
$7E0049	4 bytes	Empty	Unused RAM, cleared (with $00) during every loading screen
$7E004D	2 bytes	Sound Effect	Music track to be played - mirror of hardware register $2140 (APU I/O 0)
$7E004F	2 bytes	Sound Effect	Previous value of $7E004D (if previous == current value of hardware register $2140, do not write to register)
$7E0051	2 bytes	Sound Effect	Mirror of hardware register $2141 (APU I/O 1, pseudo-noise loop)
$7E0053	2 bytes	Sound Effect	Sound ID to be played instantly, bypasses the sound queue, directly written to hardware register $2143
$7E0055	2 bytes	Sound Effect	Previous value of $7E0053 (if previous == current value in hardware register $2143, do not write to register)
$7E0057	2 bytes	Sound Effect	Current size of sound queue (capacity 7)
$7E0059	16 bytes	Sound Effect	Sound effect queue, NOT all sounds currently playing, but instead all sound ID's (1 byte per) to be submitted for play at the current time; each frame the queue index decrements, meaning at most one sound submitted per frame
$7E0069	2 bytes	Map	World Map: Layer 1 scroll Mirrored by $7E006D
$7E006B	2 bytes	Misc.	Yoshi's jump state, mirror of $7000C0
$7E006D	2 bytes	Map	World Map: Layer 2 scroll
$7E0072	2 bytes	Map	World Map: Current stage Yoshi sprite Y coordinate
$7E0073	2 bytes	Misc.	$0000: Camera is moving right $0002: Camera is moving left
$7E0075	2 bytes	Misc.	$0000: Camera moving down $0002: Camera moving up
$7E0076	2 bytes	Map	World Map: Current stage Yoshi sprite X coordinate
$7E0077	2 bytes	Misc.	Flag: A new column has been spawned in
$7E0079	2 bytes	Map	World Map: X Scroll destination
$7E0079	2 bytes	Misc.	Flag: A new row has been spawned in
$7E007B	2 bytes	Layer 1 Tilemap	VRAM foreground tilemap address of most recently loaded column
$7E007D	2 bytes	Layer 1 Tilemap	VRAM foreground tilemap address of most recently loaded row
$7E007F	2 bytes	Layer 1 Tilemap	7E007B + 1 (right half of column)
$7E0081	2 bytes	Layer 1 Tilemap	7E007D with $0400 bit flipped (even/odd counterpart of tilemap row)
$7E0083	2 bytes	Misc.	Negative camera X column of newly spawned row shifted to: 0000000000cccc00
$7E0085	2 bytes	Layer 1 Tilemap	7E007D + $20 (bottom half of row)
$7E0087	2 bytes	Misc.	Camera X column + 1 of newly spawned row, shifted to: 0000000000cccc00
$7E0089	2 bytes	Misc.	Game Over screen state: $0000: nothing $0002: fading in $0004: active $0006: option chosen $0008: load title screen
$7E0089	2 bytes	Layer 1 Tilemap	7E0081 + $20 (second part of even/odd counterpart of tilemap row)
$7E008B	2 bytes	Misc.	Most recently spawned row's Y coordinate
$7E0091	8 bytes	Misc.	Game Over screen: Letter rotation values (Y axis), 1 byte per letter, from right to left ('R', 'E', ... 'A', 'G')
$7E0099	8 bytes	Misc.	Game Over screen: Letter rotation values (X axis), 1 byte per letter, letters from right to left ('R', 'E', ... 'A', 'G')
$7E00A1	16 bytes	Misc.	Game Over screen: Letter X coordinates, 1 word per letter, from left to right ('G', 'A', .. 'E', 'R')
$7E00B1	16 bytes	Misc.	Game Over screen: Letter Y coordinates, 1 word per letter, from left to right ('G', 'A', .. 'E', 'R')
$7E00C1	2 bytes	Misc.	Game Over screen: Scale value (size) of letters
$7E00C3	2 bytes	Misc.	Game Over screen: Current option selected ($00 = yes, $02 = no)
$7E00C5	2 bytes	Misc.	Game Over screen: Rotational velocity of letters (both X and Y axes)
$7E00C8	2 bytes	Timer	Game Over screen: Frame timer (counts down) of waiting before letter rotation restarts
$7E00CA	2 bytes	Timer	Game Over screen: Frame timer (counts up until $0200) for how long to wait until options appear
$7E00CC	53 bytes	Empty	Unused RAM, cleared (with $00) during every loading screen
$7E0100	1 byte	Empty	This area never gets initialized or emptied.
$7E0101	15 bytes	ASM	Interrupt jumps: NMI jumps to $7E0108, IRQ to $7E010C Copy of $008140-$00814E
$7E0111	7 bytes	Empty	This area never gets initialized or emptied.
$7E0118	2 bytes	Misc.	Game Mode. You can find the list of valid values here.
$7E011B	1 byte	Misc.	Full Game Mode completion flag $00: Game Mode still running (set by NMI/IRQ) $FF: Game Mode complete (set by end of game loop)
$7E011C	1 byte	Misc.	NMI & IRQ Mode $00: Nintendo Logo $02: Normal Level Mode $04: Offset-per-tile Level Modes (1-7/6-4) $06: Island Scenes $08: Story Cutscene / Credits $0A: Mode 7 bosses (Hookbill/Raphael) $0C: World Map $0E: Bonus & Bandit Games
$7E011D	2 bytes	Misc.	Mirror of hardware register $210D (BG1 Horizontal Scroll); since this register is write-twice, this is the full 16-bit mirror, it will write $7E011D and then $7E011E
$7E011F	2 bytes	Coordinate	Mirror of hardware register $210E (BG1 Vertical Scroll); since this register is write-twice, this is the full 16-bit mirror, it will write $7E011F and then $7E0120
$7E0121	1 byte	Misc.	Flag for level loading with stage intro text ($02 if true)
$7E0125	1 byte	Misc.	IRQ Counter Expected values are 0 to 2
$7E0126	1 byte	ASM	Main IRQ Mode $00: Default $02: Story Cutscene $04: Credits $06: Bonus/Bandit Games
$7E012D	1 byte	Super FX	SCBR (register $3038) mirror, used by GSU init
$7E012E	1 byte	Super FX	SCMR (register $303A) mirror, used by GSU init
$7E012F	1 byte	Debug	(Used by debug routine at $0080F8) Frame advance flag: #$00 = disable frame advance, #$01 = enable frame advance
$7E0130	1 byte	Debug	(Used by debug routine at $0080F8) Frame advance timer: When L or R is pressed on Controller 2 and frame advance flag at $012F is set, skips game mode code and decrements once per frame until it reaches 0, then next frame runs game mode code for one frame. Cleared when frame advance flag is set and neither L nor R is pressed on Controller 2.
$7E0131	2 bytes	Timer	Island: Frame counter
$7E0134	2 bytes	Level Data	Level header: Background color
$7E0136	2 bytes	Level Data	Level header: BG1 Tileset
$7E0138	2 bytes	Level Data	Level header: BG1 Palette
$7E013A	2 bytes	Level Data	Level header: BG2 Tileset
$7E013C	2 bytes	Level Data	Level header: BG2 Palette
$7E013E	2 bytes	Level Data	Level header: BG3 Tileset
$7E0140	2 bytes	Level Data	Level header: BG3 Palette
$7E0142	2 bytes	Level Data	Level header: Sprite Tileset
$7E0144	2 bytes	Level Data	Level header: Sprite Palette
$7E0146	2 bytes	Level Data	Level header: Level Mode
$7E0148	2 bytes	Level Data	Level header: Animation Tileset
$7E014A	2 bytes	Level Data	Level header: Animation Palette
$7E014C	2 bytes	Level Data	Level header: Background Scrolling
$7E014E	2 bytes	Level Data	Level header: Music
$7E0150	2 bytes	Level Data	Level header: Item Memory
$7E0152	2 bytes	Level Data	Level header: Unused
$7E015F	161 bytes	ASM	Reserved area for stack. This area never gets initialized or emptied (even upon reset / power on).
$7E0200	1 byte	Misc.	Screen brightness: s000bbbb s = black if set b = brightness
$7E0201	1 byte	Misc.	Fade in/out mode $01 = fade out $00 = fade in
$7E0203	2 bytes	Misc.	Mirror of music level header + 1 Used as index for SPC block uploads
$7E0207	4 bytes	Music	SPC block indices that are currently loaded in ARAM
$7E0212	1 byte	Bonus Challenge	Bonus game ID: $00: FLIP CARDS $02: SCRATCH AND MATCH $04: DRAWING LOTS $06: MATCH CARDS $08: ROULETTE $0A: SLOT MACHINE
$7E0216	2 bytes	Cutscene	Flag: Final world unlocked
$7E0218	2 bytes	Misc.	Current world number (0000 = world 1, 0002 = world 2, etc.) NOTE: 000C isn't a world, but it's used in the final cinema sequence
$7E021A	2 bytes	Level Number	Current level number, NOTE: not translevel #, just the first level # loaded in from map
$7E0222	72 bytes	Map	Available tiles on map screen, one byte per level tile: $00: unavailable $01: beaten $80: current (grayed out)
$7E026A	78 bytes	Empty	Unused RAM, cleared (with $00) via DMA during reset as well as before and after Nintendo logo
$7E02B8	72 bytes	Map	Current level high scores to be displayed on world map (one byte per level tile)
$7E030E	1 byte	Misc.	Current save file loaded: $00: file 1 $02: file 2 $04: file 3
$7E030F	72 bytes	Map	Map screen tile graphics, 1-byte indices (local to current world loaded)
$7E0357	27 bytes	Pause Screen	Items in pause menu, one byte per ID: $00: free slot $01: +10 star $02: +20 star $03: POW $04: full egg $05: magnifying glass $06: star cloud $07: green melon $08: blue melon $09: red melon

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