Request

Index Word	Description
0	Header code [0x00010082]
1	u8 register
2	size
3	Descriptor for mapping a write-only buffer in the target process
4	data pointer

Response

Index Word	Description
0	Header code
1	Result code

This function reads data from the MCU

ID	Info	Description
0x04 0x05	size=1, rw	Top/bottom screen flicker
0x08	size=1, ro	Raw 3D slider state
0x09	size=1, ro	Volume slider state (0x00 - 0x3F) This is the same value returned by MCUHWC:GetSoundVolume
0x0F	size=1, ??	???
0x27	size=1, ro	Raw volume slider state
0x28	size=1, ro	3D slider state(?) (0xFF if 3D is not enabled(?))
0x29 0x2D	size=n/a, ??	??? (all zeroes)
0x30	size=6(?), ro	Hexadecimal RTC
0x31	size=?, rw	This value is always ORed with 0x80, and writing 0x7F (or 0xFF) into this value makes the 3DS crash when pressing the home button. Occasionally changes.
0x3D (bugs out reg. 0x3E)	size=2, ro	Value rapidly changes, looks like RTC tick counter (resets to 0 when the seconds increase)
0x46	size=1, ro	Gyro Y(?) axis rotation (0x00 = flat, 0x40 = 3DS standing on right side, 0xBE = 3DS standing on left side)
0x48	size=1, ro	Gyro Z(?) axis rotation (0x00 = flat, 0x40 = 3DS standing vertically, 0xBE = 3DS base is vertically upside-down)
0x4A	size=1, ro	Gyro X(?) axis rotation (0x00 = 3DS standing vertically, 0x40 = face-down flat, 0xBE = flat)
0x4F	size=6(?), ??	??? (reading past 6 is FF-filled)
0x60 (bugs out reg. 0x61)	size=0x100(?), ??	???, looping queue
0x7F	size=??, ??	???