Supported Commands
To Be Determined: Transfer PAK may have some additional commands.
Device Identifiers:
? = To be verified
References:
https://github.com/mamedev/mame/blob/master/src/mame/machine/n64.cpp
https://github.com/ExtremsCorner/gba-as-controller/blob/master/source/main.arm.c
https://github.com/dolphin-emu/dolphin/tree/master/Source/Core/Core/HW/SI
https://github.com/tj90241/cen64/blob/master/si/controller.c
https://github.com/mupen64plus/mupen64plus-core/blob/master/src/backends/api/joybus.h