Recommended Initial Settings

This table shows how Nintendo recommends beginners initialize the SNES registers. All values are hexadecimal.

Some registers appear 8 bits wide to the 5A22 but actually hold 16 bits of data - these are known as "write-twice." Nintendo notates the recommended initial values of write-twice registers with the low byte on the left, and the high byte on the right (the same order the CPU should write to them) but which is opposite of most other 16-bit values.

Address	Common Name	Description	Data	Notes
2100	INIDISP	Initial Settings for Screen	8F	Forced Blank
2101	OBSEL	Object Size & Object Data Area Designation	00
2102	OAMADDL	Address for Accessing OAM	00
2103	OAMADDH	Address for Accessing OAM	00
2104	OAMDATA	Data for OAM write	OAM Data
2105	BGMODE	Background Mode & Character Size Settings	00
2106	MOSAIC	Size & Screen Designation for Mosaic Display	00
2107	BG1SC	BG1 Screen Base & Size	00
2108	BG2SC	BG2 Screen Base & Size	00
2109	BG3SC	BG3 Screen Base & Size	00
210A	BG4SC	BG4 Screen Base & Size	00
210B	BG12NBA	Background Character Data Area Designation	00
210C	BG34NBA	Background Character Data Area Designation	00
210D	BG1HOFS	Horizontal Scroll Value Designation for BG1	00 00	write-twice
210E	BG1VOFS	Vertical Scroll Value Designation for BG1	00 00	write-twice
210F	BG2HOFS	Horizontal Scroll Value Designation for BG2	00 00	write-twice
2110	BG2VOFS	Vertical Scroll Value Designation for BG2	00 00	write-twice
2111	BG3HOFS	Horizontal Scroll Value Designation for BG3	00 00	write-twice
2112	BG3VOFS	Vertical Scroll Value Designation for BG3	00 00	write-twice
2113	BG4HOFS	Horizontal Scroll Value Designation for BG4	00 00	write-twice
2114	BG4VOFS	Vertical Scroll Value Designation for BG4	00 00	write-twice
2115	VMAIN	VRAM Address Increment Value Designation	80
2116	VMADDL	Address for VRAM Read & Write	00
2117	VMADDH	Address for VRAM Read & Write	00
2118	VMDATAL	Data for VRAM Write	VRAM Data
2119	VMDATAH	Data for VRAM Write	VRAM Data
211A	M7SEL	Initial Settings in Screen Mode 7	00
211B	M7A	Rotation/Scaling Parameter A	00 01	write-twice
211C	M7B	Rotation/Scaling Parameter B	00 00	write-twice
211D	M7C	Rotation/Scaling Parameter C	00 00	write-twice
211E	M7D	Rotation/Scaling Parameter D	00 01	write-twice
211F	M7X	Rotation/Scaling Center Coordinate X	00 00	write-twice
2120	M7Y	Rotation/Scaling Center Coordinate Y	00 00	write-twice
2121	CGADD	Address for CGRAM Read & Write	00
2122	CGDATA	Data for CGRAM Write	CG Data	write-twice
2123	W12SEL	Window Mask Settings	00
2124	W34SEL	Window Mask Settings	00
2125	WOBJSEL	Window Mask Settings	00
2126	WH0	Window Position Designation	00
2127	WH1	Window Position Designation	00
2128	WH2	Window Position Designation	00
2129	WH3	Window Position Designation	00
212A	WBGLOG	Mask Logic Settings	00
212B	WOBJLOG	Mask Logic Settings	00
212C	TM	Main Screen Designation	00
212D	TS	Sub Screen Designation	00
212E	TMW	Window Mask Designation for Main Screen	00
2130	CGWSEL	Initial Settings for Fixed Color/Screen Addition	30
2131	CGADSUB	Addition/Subtraction Designation for Each BG OBJ & Color	00
2132	COLDATA	Fixed Color Data for Addition/Subtraction	E0
2133	SETINI	Screen Initial Setting	00
4200	NMITIMEN	Enable flag for Vblank, Timer Interrupt & Controller Read	00
4201	WRIO	Programmable I/O Port	FF
4202	WRMPYA	Multiplicand	00
4203	WRMPYB	Multiplier	00
4204	WRDIVL	Dividend (low byte)	00
4205	WRDIVH	Dividend (high)	00
4206	WRDIVB	Divisor	00
4207	HTIMEL	H-Count Timer Settings	00
4208	HTIMEH	H-Count Timer Settings	00
4209	VTIMEL	V-Count Timer Setting	00
420A	VTIMEH	V-Count Timer Setting	00
420B	MDMAEN	Channel Designation for General Purpose DMA & Trigger	00
420C	HDMAEN	Channel Designation for HDMA	00
420D	MEMSEL	Memory-2 Waitstate Control	00

References

• page 2-26-1 of Book 1 of the official Super Nintendo development manual