YI Memory Map

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SRAM Address	Length	Type	Description
$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

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