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IE/IF flag bits (ARM9):

bit	Purpose	See also
31..22	000000	Cannot be set
21	Unknown	Can be written
20	DS Card (IRQ pin)	DS Card Port
19	DS Card (controller)	Card Registers
18	Unknown	Can be written
17	Unknown	Can be written
16	Unknown	Can be written
15..14	00	Cannot be set
13	GBA Cart IRQ pin	GBA Cartridge Port
12	Keys	Key Input
11	DMA 3	DMA
10	DMA 2	DMA
9	DMA 1	DMA
8	DMA 0	DMA
7	0	Cannot be set
6	Timer 3	Timers
5	Timer 2	Timers
4	Timer 1	Timers
3	Timer 0	Timers
2	Y-Equals	Video
1	H-Blank	Video
0	V-Blank	Video

ARM7:

24	Wireless hardware	Main ?
23	SPI completed	SPI
22	Hinge close magnet	KeyInput
20	DS Card (IRQ pin)	DS Card Port
19	DS Card (controller)	Card Registers
13	GBA Cart IRQ pin	GBA Cartridge Port
12	Keys	Key Input
11	DMA 3	DMA
10	DMA 2	DMA
9	DMA 1	DMA
8	DMA 0	DMA
6	Timer 3	Timers
5	Timer 2	Timers
4	Timer 1	Timers
3	Timer 0	Timers
2	Y-Equals	Video
1	H-Blank	Video
0	V-Blank	Video

IE: 0x04000210:32 IF: 0x04000214:32 IME: 0x04000208:32 (8/16/32 accesses work, but only the LSB has any meaning, all others read 0, and ignore writes)

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