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YI Memory Map

Displaying 50 out of 286 addresses.

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SRAM Address Length Type Description Details
$700000 112 bytes Super FX Scratch RAM, used like "registers" for various operations on the Super FX, also used as additional parameters to Super FX routines
$700070 1 byte Controller Controller Data 1 (for gamemode 0F):
AXLR----
A = A; X = X; L = L; R = R
$700071 1 byte Controller Controller Data 2 (for gamemode 0F):
byetUDLR
b = B; y = Y; e = Select; t = Start; U = up; D = down; L = left, R = right
$700072 1 byte Controller Controller Data 1, on press/first frame (for gamemode 0F):
AXLR----
A = A; X = X; L = L; R = R
$700073 1 byte Controller Controller Data 2, on press/first frame (for gamemode 0F):
byetUDLR
b = B; y = Y; e = select; t = Start; U = up; D = down; L = left, R = right
$700076 2 bytes Sound Effect Mirror of $7E0051 (register $2141) for GSU player control routine, used for transformations
$70007A 2 bytes Sound Effect Super FX sound ID, returned by GSU to push into sound queue (play a sound effect)
$700082 1 byte Controller Controller settings ($00 = patient; $02 = hasty)
$70008A 2 bytes Misc. Yoshi's X subpixel position (high byte is spillage)
$70008C 2 bytes Misc. Yoshi's X position
$70008E 2 bytes Misc. Yoshi's Y subpixel position (high byte is spillage)
$700090 2 bytes Misc. Yoshi's Y position
$700092 2 bytes Misc. Pointer to next free slot in OAM buffer
$700094 2 bytes Misc. Layer 1 Camera X
$700096 2 bytes Misc. Layer 2 Camera X
$700098 2 bytes Misc. Layer 3 Camera X
$70009A 2 bytes Misc. Layer 4 Camera X
$70009C 2 bytes Misc. Layer 1 Camera Y
$70009E 2 bytes Misc. Layer 2 Camera Y
$7000A0 2 bytes Misc. Layer 3 Camera Y
$7000A2 2 bytes Misc. Layer 4 Camera Y
$7000A4 2 bytes Misc. X position of the leftmost tiles on the screen
$7000A6 2 bytes Misc. Y position of the uppermost tiles on the screen
$7000A8 2 bytes Misc. Previous frame Yoshi's X velocity
$7000AA 2 bytes Misc. Yoshi's Y velocity
$7000AC 2 bytes Misc. Yoshi state:
$0000: Regular (player control)
$0002: Cutscenes; screen transition (pipe going right)
$0003: In screen transition (pipe going left)
$0004: In screen transition (pipe going down); in prologue cutscene (Baby Mario mounted)
$0005: In screen transition (pipe going up)
$0006: Entering/exiting pipe; in transition (pipe going right)
$0007: In screen transition (pipe going left)
$0008: In screen transition
$0009: In screen transition
$000A: Entering door
$000E: Dying from spike
$0010: Transforming
$0012: Smashed by falling wall (sprite $036)
$0014: Activating goal
$0016: During level intro
$0018: Being thrown toward baby mario at end of transformation
$001A: Dying in pit / inside piranha plant / receiving boss key / shrinking during Prince Froggy
$001C: During prologue cutscene
$001E: Pushed away in Raphael Cutscene
$0020: Entering Raphael Boss room (moon)
$0022: Entering keyhole during boss key cutscene
$0028: Dying from lava
$002A: Being ejected vertically (after transition)
$7000AE 2 bytes Misc. Yoshi form:
$0000: Yoshi
$0002: Car Yoshi
$0004: Mole Yoshi
$0006: Helicopter Yoshi
$0008: Train Yoshi
$000A: Mushroom Yoshi (Beta)
$000C: Sub Yoshi
$000E: Ski Yoshi
$0010: Super Baby Mario
$0012: Plane Yoshi (Beta)
$7000B0 2 bytes Misc. Yoshi's X position relative to camera
$7000B2 2 bytes Misc. Yoshi's Y position relative to camera
$7000B4 2 bytes Misc. Yoshi's X velocity
$7000B6 2 bytes Misc. Angle of ground Yoshi is on
$7000B8 2 bytes Misc. Angle of terrain slope that Yoshi's top is colliding with
$7000BA 2 bytes Misc. Angle of terrain slope that Yoshi's middle part is colliding with
$7000BC 2 bytes Misc. Angle of terrain slope that Yoshi's bottom part is colliding with
$7000BE 2 bytes Misc. Yoshi's current animation frame
$7000C0 2 bytes Player Physics Yoshi's jump state:
$0006: Jumping
$0007: Peak of jump
$0008: Falling
$7000C2 2 bytes Player Physics Yoshi's ducking state:
$0000: not ducking
$0001-$0004: mid-duck / mid-duck release
$0005: fully ducked
$7000C4 2 bytes Misc. Yoshi facing direction ($0000: right, $0002: left)
$7000C6 2 bytes Player Physics Yoshi swimming state:
$0000: not swimming
$0001: landing in water, no player control
$0002: feet up briefly after landing
$0003: swimming
$7000CC 1 byte Misc. Direction player last accelerated from input:
$00: not moving
$01: right
$02: left
$7000CE 2 bytes Flag $004C: Player is holding Up while on ground, $0000 not
$7000D2 1 byte Misc. Yoshi fluttering state:
$00: After a flutter, midair
$01: Not in a flutter chain: resets to this upon hitting ground or ceiling
$02: Begin flutter
$04, $06, $08: Mid-flutter states
$7000D3 1 byte Flag $80: extended fluttering, $00 not
$7000D4 2 bytes Misc. Ground pound state:
$0001~$0006: init states
$0007: falling
$0008~$000B: hitting the ground
$000C: fully on ground, other actions enabled
$7000D6 2 bytes Misc. Frame counter for holding Down button in air to ground pound. When it reaches $0007, ground pound will initiate. Set to $FFFF when pressing down on ground
$7000DA 2 bytes Player Physics Yoshi's stair state/counter, counts down/up in between steps on stairs (only high byte is used):
$0800 to $0100 for left-facing stairs
$F800 to $FF00 for right-facing stairs
$7000DC 2 bytes Misc. Frame counter for pushing yourself against a wall / a pushable sprite. The pushing animation starts at $10, and it loops at $23. NOTE: For pushable sprites, the entire range is +1 so starts at $01, $11 is animation, stops at $24.
$7000DE 2 bytes Misc. Egg throwing state (decrements over time):
$0007~$000A: init
$0006: cursor out, ready to throw
$0001~$0005: has been thrown
$0000: not throwing
$7000E0 2 bytes Misc. Egg cursor distance from Yoshi:
Byte 1: Subpixels
Byte 2: Pixels
$7000E4 2 bytes Misc. Egg cursor X position

When spitting an enemy this is used together with player speed to set enemy X-speed

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