ARM programming for the Nintendo DS

The Nintendo DS is the sucessor to the Gameboy advance, based on the ARM - the NDS uses an ARM9 as it's main processor - with an ARM7 secondary processor - which is used for backwards compatibility with the Gameboy Advance.

Tech Specs

CPU	66 MHZ ARM9 + 33 MHZ ARM7TDMI
Memory	4MB - 656k VRAM
Resolution	256x192 x 2 screens - 32K colors
3D	1x 3D screen 1x 2D screen
Sound	16 channel

If you want to learn ARM get the Cheatsheet! it has all the ARM7 commands, it covers the commands, and options like Bitshifts and conditions as well as the bytecode structure of the commands!

ARM Hello World Series

Hello World on the Nintendo DS - ARM Assembly Lesson H3

ARM Platform Specific Lessons

Lesson P4 - Bitmap graphics and Palette definitions on the Nintendo DS (16 bit - 32768 colors) [NDS]

Lesson P5 - Joypad & Pen on the GBA / NDS ... Key reading on Risc OS [NDS] [GBA] [ROS]

Lesson P7 - Sound on the Nintendo DS [NDS]

Lesson P8 - 16 color Tilemap on the Gameboy Advance and Nintendo DS! [GBA] [NDS]

Lesson P9 - Hardware Sprites on the Gameboy Advance and Nintendo DS! [GBA] [NDS]

Graphics hardware

The Nintendo DS has two screens, and two 'Graphics engines'... each Graphics engine can drive either screen, but only one screen at a time.

Graphics Engine A is the most powerful... it can do GBA style 2D, 3D or directly show RAM to screen.... it can also do screen capture.

Graphics Engine B is more limited, it can only do GBA style 2D*

In these tutorials, we'll use Graphics Engine A for the top screen, showing Direct Ram.... we'll use Graphics Engine B in Apline (Rotate & Scale) mode, showing an area of memory onscreen with Background Layer 2...

Despite the different setup, the result is both screens are memory mapped in -bABBBBBGGGGGRRRRR - with 1 bit of Alpha, and 5 bits of Red,Green and Blue (The Alpha is unused for the top screen - as it's showing direct ram)

* it's not possible to do 3D on both screens - however Engine A can capture 3D, and show that as an image on Engine B - halving the framerate, but giving apparent 3D on both screens!

Technical Resources

GBATEK - complete documentation on the GBA and NDS - this tutorial would not be possible without the content on their site!

Memory Map

Address	Purpose
0x00000000	Instruction TCM (32KB) (not moveable) (mirror-able to 1000000h)
0x00????000	Data TCM (16KB) (moveable)
0x02000000	Main Memory (4MB)
0x03000000	Shared WRAM (0KB, 16KB, or 32KB can be allocated to ARM9)
0x04000000	ARM9-I/O Ports
0x05000000	Engine A Standard BG Palette (512 bytes)
0x05000200	Engine A Standard OBJ Palette (512 bytes)
0x05000400	Engine B Standard BG Palette (512 bytes)
0x05000600	Engine B Standard OBJ Palette (512 bytes)
0x06000000	VRAM - Engine A, BG VRAM (max 512KB)
0x06200000	VRAM - Engine B, BG VRAM (max 128KB)
0x06400000	VRAM - Engine A, OBJ VRAM (max 256KB)
0x06600000	VRAM - Engine B, OBJ VRAM (max 128KB)
0x06800000	VRAM - "LCDC"-allocated (max 656KB)
0x07000000	Engine A OAM (1024 bytes)
0x07000400	Engine B OAM (1024 bytes)
0x08000000	GBA Slot ROM (max 32MB)
0x0A000000	GBA Slot RAM (max 64KB)
0xFFFF0000	ARM9-BIOS (32KB) (only 3K used)

Ports (ARM9 side)

Category	Address	Name	Description
DispA	0x4000000	DISPCNT	LCD Control (RW)
DispA	0x4000004		2D Engine A+B - DISPSTAT - General LCD Status (RW) (Bit 0=VBlank)
DispA	0x4000006		2D Engine A+B - VCOUNT - Vertical Counter (Read only)
DispA	0x4000008		2D Engine A (same registers as GBA, some changed bits)
DispA	0x4000008	BG0CNT	BG0 Control
DispA	0x400000A	BG1CNT	BG1 Control
DispA	0x400000C	BG2CNT	BG2 Control
DispA	0x400000E	BG3CNT	BG3 Control
DispA	0x4000010	BG0HOFS	BG0 X-Offset
DispA	0x4000012	BG0VOFS	BG0 Y-Offset
DispA	0x4000014	BG1HOFS	BG1 X-Offset
DispA	0x4000016	BG1VOFS	BG1 Y-Offset
DispA	0x4000018	BG2HOFS	BG2 X-Offset
DispA	0x400001A	BG2VOFS	BG2 Y-Offset
DispA	0x400001C	BG3HOFS	BG3 X-Offset
DispA	0x400001E	BG3VOFS	BG3 Y-Offset
DispA	0x4000020	BG2PA	BG2 Rotation/Scaling Parameter A (dx)
DispA	0x4000022	BG2PB	BG2 Rotation/Scaling Parameter B (dmx)
DispA	0x4000024	BG2PC	BG2 Rotation/Scaling Parameter C (dy)
DispA	0x4000026	BG2PD	BG2 Rotation/Scaling Parameter D (dmy)
DispA	0x4000028	BG2X	BG2 Reference Point X-Coordinate
DispA	0x400002C	BG2Y	BG2 Reference Point Y-Coordinate
DispA	0x4000030	BG3PA	BG3 Rotation/Scaling Parameter A (dx)
DispA	0x4000032	BG3PB	BG3 Rotation/Scaling Parameter B (dmx)
DispA	0x4000034	BG3PC	BG3 Rotation/Scaling Parameter C (dy)
DispA	0x4000036	BG3PD	BG3 Rotation/Scaling Parameter D (dmy)
DispA	0x4000038	BG3X	BG3 Reference Point X-Coordinate
DispA	0x400003C	BG3Y	BG3 Reference Point Y-Coordinate
DispA	0x4000040	WIN0H	Window 0 Horizontal Dimensions
DispA	0x4000042	WIN1H	Window 1 Horizontal Dimensions
DispA	0x4000044	WIN0V	Window 0 Vertical Dimensions
DispA	0x4000046	WIN1V	Window 1 Vertical Dimensions
DispA	0x4000048	WININ	Inside of Window 0 and 1
DispA	0x400004A	WINOUT	Inside of OBJ Window & Outside of Windows
DispA	0x400004C	MOSAIC	Mosaic Size
DispA	0x400004E	-	Not used
DispA	0x4000050	BLDCNT	Color Special Effects Selection
DispA	0x4000052	BLDALPHA	Alpha Blending Coefficients
DispA	0x4000054	BLDY	Brightness (Fade-In/Out) Coefficient
DispA	0x4000056	-	Not used
DispA	0x4000060		DISP3DCNT - 3D Display Control Register (R/W)
DispA	0x4000064		DISPCAPCNT - Display Capture Control Register (R/W)
DispA	0x4000068		DISP_MMEM_FIFO - Main Memory Display FIFO (R?/W)
DispA	0x400006C		2D Engine A - MASTER_BRIGHT - Master Brightness Up/Down
DMA/Key	0x40000B0		DMA Channel 0..3
DMA/Key	0x40000E0		DMA FILL Registers for Channel 0..3
DMA/Key	0x4000100		Timers 0..3
DMA/Key	0x4000130		KEYINPUT (Gameboy Advance Type Keys UDLR AB Sel Start)
DMA/Key	0x4000132		KEYCNT
IPC/Rom	0x4000180		IPCSYNC - IPC Synchronize Register (R/W)
IPC/Rom	0x4000184		IPCFIFOCNT - IPC Fifo Control Register (R/W)
IPC/Rom	0x4000188		IPCFIFOSEND - IPC Send Fifo (W)
IPC/Rom	0x40001A0		AUXSPICNT - Gamecard ROM and SPI Control
IPC/Rom	0x40001A2		AUXSPIDATA - Gamecard SPI Bus Data/Strobe
IPC/Rom	0x40001A4		Gamecard bus timing/control
IPC/Rom	0x40001A8		Gamecard bus 8-byte command out
IPC/Rom	0x40001B0		Gamecard Encryption Seed 0 Lower 32bit
IPC/Rom	0x40001B4		Gamecard Encryption Seed 1 Lower 32bit
IPC/Rom	0x40001B8		Gamecard Encryption Seed 0 Upper 7bit (bit7-15 unused)
IPC/Rom	0x40001BA		Gamecard Encryption Seed 1 Upper 7bit (bit7-15 unused)
Ram/IRQ	0x4000204		EXMEMCNT - External Memory Control (R/W)
Ram/IRQ	0x4000208		IME - Interrupt Master Enable (R/W)
Ram/IRQ	0x4000210		IE
Ram/IRQ	0x4000214		IF
Ram/IRQ	0x4000240		VRAMCNT_A - VRAM-A (128K) Bank Control (W)
Ram/IRQ	0x4000241		VRAMCNT_B - VRAM-B (128K) Bank Control (W)
Ram/IRQ	0x4000242		VRAMCNT_C - VRAM-C (128K) Bank Control (W)
Ram/IRQ	0x4000243		VRAMCNT_D - VRAM-D (128K) Bank Control (W)
Ram/IRQ	0x4000244		VRAMCNT_E - VRAM-E (64K) Bank Control (W)
Ram/IRQ	0x4000245		VRAMCNT_F - VRAM-F (16K) Bank Control (W)
Ram/IRQ	0x4000246		VRAMCNT_G - VRAM-G (16K) Bank Control (W)
Ram/IRQ	0x4000247		WRAMCNT
Ram/IRQ	0x4000248		VRAMCNT_H - VRAM-H (32K) Bank Control (W)
Ram/IRQ	0x4000249		VRAMCNT_I - VRAM-I (16K) Bank Control (W)
Maths	0x4000280		DIVCNT - Division Control (R/W)
Maths	0x4000290		DIV_NUMER - Division Numerator (R/W)
Maths	0x4000298		DIV_DENOM - Division Denominator (R/W)
Maths	0x40002A0		DIV_RESULT - Division Quotient (=Numer/Denom) (R)
Maths	0x40002A8		DIVREM_RESULT - Division Remainder (=Numer MOD Denom) (R)
Maths	0x40002B0		SQRTCNT - Square Root Control (R/W)
Maths	0x40002B4		SQRT_RESULT - Square Root Result (R)
Maths	0x40002B8		SQRT_PARAM - Square Root Parameter Input (R/W)
Maths	0x4000300		POSTFLG - Undoc
Maths	0x4000304		POWCNT1 - Graphics Power Control Register (R/W)
Disp3D	0x4000320..6A3
2D Engine B	0x4001000	DISPCNT	LCD Control (RW)
2D Engine B	0x4001008		(same registers as GBA, some changed bits)
2D Engine B	0x4001008	BG0CNT	BG0 Control
2D Engine B	0x400100A	BG1CNT	BG1 Control
2D Engine B	0x400100C	BG2CNT	BG2 Control
2D Engine B	0x400100E	BG3CNT	BG3 Control
2D Engine B	0x4001010	BG0HOFS	BG0 X-Offset
2D Engine B	0x4001012	BG0VOFS	BG0 Y-Offset
2D Engine B	0x4001014	BG1HOFS	BG1 X-Offset
2D Engine B	0x4001016	BG1VOFS	BG1 Y-Offset
2D Engine B	0x4001018	BG2HOFS	BG2 X-Offset
2D Engine B	0x400101A	BG2VOFS	BG2 Y-Offset
2D Engine B	0x400101C	BG3HOFS	BG3 X-Offset
2D Engine B	0x400101E	BG3VOFS	BG3 Y-Offset
2D Engine B	0x4001020	BG2PA	BG2 Rotation/Scaling Parameter A (dx)
2D Engine B	0x4001022	BG2PB	BG2 Rotation/Scaling Parameter B (dmx)
2D Engine B	0x4001024	BG2PC	BG2 Rotation/Scaling Parameter C (dy)
2D Engine B	0x4001026	BG2PD	BG2 Rotation/Scaling Parameter D (dmy)
2D Engine B	0x4001028	BG2X	BG2 Reference Point X-Coordinate
2D Engine B	0x400102C	BG2Y	BG2 Reference Point Y-Coordinate
2D Engine B	0x4001030	BG3PA	BG3 Rotation/Scaling Parameter A (dx)
2D Engine B	0x4001032	BG3PB	BG3 Rotation/Scaling Parameter B (dmx)
2D Engine B	0x4001034	BG3PC	BG3 Rotation/Scaling Parameter C (dy)
2D Engine B	0x4001036	BG3PD	BG3 Rotation/Scaling Parameter D (dmy)
2D Engine B	0x4001038	BG3X	BG3 Reference Point X-Coordinate
2D Engine B	0x400103C	BG3Y	BG3 Reference Point Y-Coordinate
2D Engine B	0x4001040	WIN0H	Window 0 Horizontal Dimensions
2D Engine B	0x4001042	WIN1H	Window 1 Horizontal Dimensions
2D Engine B	0x4001044	WIN0V	Window 0 Vertical Dimensions
2D Engine B	0x4001046	WIN1V	Window 1 Vertical Dimensions
2D Engine B	0x4001048	WININ	Inside of Window 0 and 1
2D Engine B	0x400104A	WINOUT	Inside of OBJ Window & Outside of Windows
2D Engine B	0x400104C	MOSAIC	Mosaic Size
2D Engine B	0x400104E	-	Not used
2D Engine B	0x4001050	BLDCNT	Color Special Effects Selection
2D Engine B	0x4001052	BLDALPHA	Alpha Blending Coefficients
2D Engine B	0x4001054	BLDY	Brightness (Fade-In/Out) Coefficient
2D Engine B	0x4001056	-	Not used
2D Engine B	0x400106C	MASTER_BRIGHT	16bit - Brightness Up/Down
DSI	0x40021Ax		DSi Registers
DSI	0x4004xxx		DSi Registers
IPC/Rom	0x4100000		IPCFIFORECV - IPC Receive Fifo (R)
IPC/Rom	0x4100010		Gamecard bus 4-byte data in, for manual or dma read
Debug	0x4FFF0xx		Ensata Emulator Debug Registers
Debug	0x4FFFAxx		No$gba Emulator Debug Registers
Exception	0x27FFD9C		NDS9 Debug Stacktop / Debug Vector (0=None)
Exception	DTCM+3FF8 4
Exception	DTCM+3FFC 4
RamCtrl	0x27FFFFE		Main Memory Control

NDS Header

Offset	Bytes	Purpose	Notes	Sample
000h	12	Game Title	(Uppercase ASCII, padded with 00h)	.ascii "LEARNASM.NET"
00Ch	4	Gamecode	(Uppercase ASCII, NTR-<code>)(0=homebrew)	.ascii "0000"
010h	2	Makercode	(Uppercase ASCII, eg. "01"=Nintendo) (0=homebrew)	.ascii "00"
012h	1	Unitcode	(00h=NDS, 02h=NDS+DSi, 03h=DSi) (bit1=DSi)	.byte 0x00
013h	1	Encryption Seed Select	(00..07h, usually 00h)	.byte 0x00
014h	1	Devicecapacity	(Chipsize = 128KB SHL nn) (eg. 7 = 16MB)	.byte 0x00
015h	7	Reserved	(zero filled)	.space 7
01Ch	1	Reserved	(zero)(except, used on DSi)	.byte 0
01Dh	1	NDS Region	(00h=Normal, 80h=China, 40h=Korea) (other on DSi)	.byte 0
01Eh	1	ROM Version	(usually 00h)	.byte 0
01Fh	1	Autostart	(Bit2: Skip "Press Button" after Health and Safety)	.byte 4
020h	4	ARM9 rom_offset	(0x4000h and up, align 1000h)	.long Arm9_Start-HeaderStart
024h	4	ARM9 entry_address	(2000000h..23BFE00h)	.long 0x02000000
028h	4	ARM9 ram_address	(2000000h..23BFE00h)	.long 0x02000000
02Ch	4	ARM9 size	(max 3BFE00h) (3839.5KB)	.long Arm9_End-Arm9_Start
030h	4	ARM7 rom_offset	(8000h and up)	.long Arm7_Start-HeaderStart
034h	4	ARM7 entry_address	(2000000h..23BFE00h, or 37F8000h..3807E00h)	.long 0x03800000
038h	4	ARM7 ram_address	(2000000h..23BFE00h, or 37F8000h..3807E00h)	.long 0x03800000
03Ch	4	ARM7 size	(max 3BFE00h, or FE00h) (3839.5KB, 63.5KB)	.long Arm7_End-Arm7_Start
040h	4	File Name Table (FNT) offset		.long 0
044h	4	File Name Table (FNT) size		.long 0
048h	4	File Allocation Table (FAT) offset		.long 0
04Ch	4	File Allocation Table (FAT) size		.long 0
050h	4	File ARM9 overlay_offset		.long 0
054h	4	File ARM9 overlay_size		.long 0
058h	4	File ARM7 overlay_offset		.long 0
05Ch	4	File ARM7 overlay_size		.long 0
060h	4	Port 0x40001A4h setting for normal cmd	(usually 00586000h)	.long 0x00586000
064h	4	Port 0x40001A4h setting for KEY1 cmd	(usually 001808F8h)	.long 0x001808F8
068h	4	Icon/Title offset	(0=None) (8000h and up)	.long 0
06Ch	2	Secure Area Checksum	CRC-16 of [[020h]..00007FFFh]	.word 0
06Eh	2	Secure Area Delay (in 131kHz units)	(051Eh=10ms or 0D7Eh=26ms)	.word 0
070h	4	ARM9 Auto Load List Hook RAM Addr.	\endaddr of auto-load	.long 0
074h	4	ARM7 Auto Load List Hook RAM Addr.	/functions	.long 0
078h	8	Secure Area Disable	(by encrypted "NmMdOnly") (usually zero)	.space 8
080h	4	Total Used ROM size	(remaining/unused bytes usually FFh-padded)	.long 0
084h	4	ROM Header Size	(0x4000h)	.long 0x0x4000
088h	28h	Reserved	(zero filled except, [88h..93h] used on DSi)	.space 0x28
0B0h	10h	Reserved	(zero filled or "DoNotZeroFillMem"=unlaunch fastboot)	.space 0x10
0C0h	9Ch	Nintendo Logo	(compressed bitmap, same as in GBA Headers)	.space 0x9C
15Ch	2	Nintendo Logo Checksum	CRC-16 of [0C0h-15Bh], fixed CF56h	.word 0
15Eh	2	Header Checksum	CRC-16 of [000h-15Dh]	.word 0
160h	4	Debug rom_offset	(0=none) (8000h and up) only if debug	.long 0
164h	4	Debug size	(0=none) (max 3BFE00h)	.long 0
168h	4	Debug ram_address	(0=none) (20x400000h..27BFE00h) SIO and 8MB	.long 0
16Ch	4	Reserved	(zero filled) (transferred, and stored, but not used)	.long 0
170h	90h	Reserved	(zero filled) (transferred, and stored, but not used)	.space 0x90

Bare Metal ARM Assembly Hello World Example

There is a working 'single asm' bare metal sample in the sources.7z

the JOY of NDS

The Nintendo DS joypad buttons are split into two addresses...

The first is the classic GBA keys - these can be read from either the ARM9 or ARM7

0x0x4000130 - Joypad Keys (GBA Type) ------LRDULRSsBA

The second is the new NDS keys... these can ONLY be read from the ARM7

0x0x4000136 - Extra Key Input --------HP--D-YX

a PEN in the BUS

Accessing the PEN pos can only be done from the ARM7 - and its not entirely easy!

the X and Y pos use 12 bits each, but we can only load them 8 bits at a time, via a serial bus....

0x0x40001C0 - SPICNT - SPI Bus Control/Status Register
0x0x40001C2 - SPIDATA - SPI Bus Data/Strobe Register

Here is the sequence for reading an axis...

#0b1000101000000001 -> SPICNT (Select Touchscreen)

#0b11010100 -> SPIDATA (Xpos) ... OR .... #0b10010100 -> SPIDATA (Ypos)

SPICNT -> Wait for Bit 7 of SPICNT to become 0

#0 -> SPIDATA

SPICNT -> Wait for Bit 7 of SPICNT to become 0

SPIDATA-> top 8 bits of axis HHHHHHHH

#0b1000001000000001 ->SPICNT (Get 2nd byte)
#0 -> SPIDATA

SPICNT -> Wait for Bit 7 of SPICNT to become 0

SPIDATA-> bottom 4 bits of axis LLLL0000

Sound Registers (ARM7)

The NDS has 16 sound channels (x nibble 0-F) which play digital sound samples

Address	Bytes	Name	Description	Bits	Notes
0x4000304h	2	POWCNT2	Sound/Wifi Power Control Register (R/W)	------WS	S=Sound on W=Wifi on
0x40004x0h	4	SOUNDxCNT	Sound Channel X Control Register (R/W)	SFFRRWWW-PPPPPPPH-----DD-VVVVVVV	S=Start F=Format R=Repeat W=Wave duty P=Panning H=Hold D=volume Div V=Volume
0x40004x4h	4	SOUNDxSAD	Sound Channel X Data Source Register (W)	-----AAAAAAAAAAAAAAAAAAAAAAAA00	A=Address of sample
0x40004x8h	2	SOUNDxTMR	Sound Channel X Timer Register (W)	FFFFFFFFFFFFFFFF	F=Frequency
0x40004xAh	2	SOUNDxPNT	Sound Channel X Loopstart Register (W)	LLLLLLLLLLLLLLLL	L=Loop Start
0x40004xCh	4	SOUNDxLEN	Sound Channel X Length Register (W)	----------LLLLLLLLLLLLLLLLLLLLL	L=Length
0x4000500h	2	SOUNDCNT	Sound Control Register (R/W)	M-31RRLL-VVVVVVV	M=Master on 31=output 31 to mixer RRLL=output from V=master Volume
0x4000504h	2	SOUNDBIAS	Sound Bias Register (R/W)	-------BBBBBBBBBB	B=Sound Bias
0x4000508h	1	SNDCAP0CNT	Sound Capture 0 Control Register (R/W)	S---FEsC	S=Start F=Format R=Repeat s=source C=Control
0x4000509h	1	SNDCAP1CNT	Sound Capture 1 Control Register (R/W)	S---FEsC
0x4000510h	4	SNDCAP0DAD	Sound Capture 0 Destination Address (R/W)	-----AAAAAAAAAAAAAAAAAAAAAAAA00	A=Address of Capture
0x4000514h	2	SNDCAP0LEN	Sound Capture 0 Length (W)	LLLLLLLLLLLLLLLL	L=Length
0x4000518h	4	SNDCAP1DAD	Sound Capture 1 Destination Address (R/W)	-----AAAAAAAAAAAAAAAAAAAAAAAA00
0x400051Ch	2	SNDCAP1LEN	Sound Capture 1 Length (W)	LLLLLLLLLLLLLLLL	L=Length

Sprites

Sprite patterns are defined by by VRAM addresses 0x060x400000+

Sprites use the 256 colors in the OBJ palette from address 0x05000200+

Sprites are made up of 8x8 patterns with either 16 colors (4bpp) or 256 colors (8bpp) defined by the color bit in the first parameter.

H Byte

L Byte

VRAM Address

Details

7000000h

Y=Ypos S=Shape (Square /HRect / Vrect) C=Colors(16/256) M=Mosiac
T=Transparent D=Disable/Doublesize R=Rotation

7000002h

X=Xpos S=Obj Size (8x8,16x16,32x32,64x64) VH=V/HFlip
R=Rotation parameter

7000004h

T=Tile Number
C=Color palette (16 color mode) P=Priority

7000006h

Unused by sprite

Rotation and Scaling

On the GBA and NDS In some modes, Layers BG2 and BG3 can be rotated and scaled. The control of this is performed by registers 0x4001020h-0x400103Ch

For the mathematically challenged (Like me) I've created a spreadsheet which helps calculate the correct values for the effect you want... get it Here

NDS Example:

Bit Meanings: S=Sign I=Integer F=Float

Address	Function	Name	Bits	Default
0x0x4001020	BG2PA	BG2 Rotation/Scaling Parameter A (dx)	SIIIIIIIFFFFFFFF	0x0100
0x0x4001022	BG2PB	BG2 Rotation/Scaling Parameter B (dmx)	SIIIIIIIFFFFFFFF	0x0000
0x0x4001024	BG2PC	BG2 Rotation/Scaling Parameter C (dy)	SIIIIIIIFFFFFFFF	0x0000
0x0x4001026	BG2PD	BG2 Rotation/Scaling Parameter D (dmy)	SIIIIIIIFFFFFFFF	0x0100
0x0x4001028	BG2X	BG2 Reference Point X-Coordinate	----SIIIIIIIIIIIIIIIIIIIFFFFFFFF	0x00000000
0x0x400102C	BG2Y	BG2 Reference Point Y-Coordinate	----SIIIIIIIIIIIIIIIIIIIFFFFFFFF	0x00000000
0x0x4001030	BG3PA	BG3 Rotation/Scaling Parameter A (dx)	SIIIIIIIFFFFFFFF	0x0100
0x0x4001032	BG3PB	BG3 Rotation/Scaling Parameter B (dmx)	SIIIIIIIFFFFFFFF	0x0000
0x0x4001034	BG3PC	BG3 Rotation/Scaling Parameter C (dy)	SIIIIIIIFFFFFFFF	0x0000
0x0x4001036	BG3PD	BG3 Rotation/Scaling Parameter D (dmy)	SIIIIIIIFFFFFFFF	0x0100
0x0x4001038	BG3X	BG3 Reference Point X-Coordinate	----SIIIIIIIIIIIIIIIIIIIFFFFFFFF	0x00000000
0x0x400103C	BG3Y	BG3 Reference Point Y-Coordinate	----SIIIIIIIIIIIIIIIIIIIFFFFFFFF	0x00000000