YI Memory Map - SMW Central

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RAM Address	Length	Type	Description	Details
$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)

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