Controller bitmap

Each gameplay input byte is a 7-bit controller bitmask (the top bit is masked off with & 0x7f). This map is used both on the wire (F8 frames) and in the input slots 0x570d / 0x5715.

Bit	Mask	Button
0	0x01	Up
1	0x02	Down
2	0x04	Left
3	0x08	Right
4	0x10	A
5	0x20	B
6	0x40	Option
7	0x80	(masked, unused on the wire)

Examples

Value	Buttons
0x00	(none)
0x08	Right
0x10	A
0x18	Right + A
0x14	Left + A
0x30	A + B
0x24	Left + B

Provenance

Independently established three ways:

1. Physical capture — single-bit values 0x01/0x04/0x08/0x10/0x20 plus plausible direction+attack combos in the F8 stream.
2. Disassembly — the input slots 0x570d/0x5715 and the and …,0x7f masking around 0x2074bf.
3. Emulated ROM — feeding scripted inputs and reading the decoded slots back under live data (e.g. peer A=0x10 → 0x570d, local Right=0x08 → 0x5715).