NDS File Format

Header format

Field	Start	End	Size	Example data (Metroid demo)
Game title	0x000	0x00B	12	"FIRST HUNT "
Game code	0x00C	0x00F	4	"AMFE"
Maker code	0x010	0x011	2	"01" (Nintendo)
Unit code	0x012	0x012	1	0x00
Device code	0x013	0x013	1	0x00
Card size	0x014	0x014	1	0x07 (2^(20 + 7) = 128Mb = 16 MB)
Card info	0x015	0x01E	10	0x00's
Flags	0x01F	0x01F	1	0x00
ARM9 source (ROM)	0x020	0x023	4	0x00004000 (must be 4 KB aligned)
ARM9 execute addr	0x024	0x027	4	0x02004800
ARM9 copy to addr	0x028	0x02B	4	0x02004000
ARM9 binary size	0x02C	0x02F	4	0x00081D58
ARM7 source (ROM)	0x030	0x033	4	0x000B3000
ARM7 execute addr	0x034	0x037	4	0x02380000
ARM7 copy to addr	0x038	0x03B	4	0x02380000
ARM7 binary size	0x03C	0x03F	4	0x00026494
Filename table offset (ROM)	0x040	0x043	4	0x000D9600
Filename table size	0x044	0x047	4	0x11B6
FAT offset (ROM)	0x048	0x04B	4	0x000DA800
FAT size	0x04C	0x04F	4	0x678
ARM9 overlay src (ROM)	0x050	0x053	4	0x00085E00
ARM9 overlay size	0x054	0x057	4	0x60
ARM7 overlay src (ROM)	0x058	0x05B	4	0
ARM7 overlay size	0x05C	0x05F	4	0
Control register flags for read	0x060	0x063	4	0x00586000
Control register flags for init	0x064	0x067	4	0x001808F8
Icon+titles (ROM)	0x068	0x06B	4	0x000DB000
Secure CRC16	0x06C	0x06D	2	0xC44D
ROM timeout	0x06E	0x06F	2	0x051E
ARM9 unk addr	0x070	0x073	4	0x020049EC
ARM7 unk addr	0x074	0x077	4	0x02380110
Magic number for unencrypted mode	0x078	0x07F	8	0x00's
ROM size	0x080	0x083	4	0x00EE3E44
Header size	0x084	0x087	4	0x4000
Unknown 5	0x088	0x0BF	56	0x00's
GBA logo	0x0C0	0x15B	156	data
Logo CRC16	0x15C	0x15D	2	0xCF56