Just wrote a super simple program in SDL that shows me the key codes for various keys, and loaded it up on my NanoNote:
Volume Up = 292
Volume Down = 293
The rest of the keys I listed have normal SDLKey constants (SDLK_ESCAPE, SDLK_RETURN, etc).
By the way, I tested the !Reader on the Dingoo, works great, and it's read every file I've thrown it yet!
Thanks alot for your port, and I hope to see a BNN binary in the near future!
Btw, it wouldn't load on my NanoNote:
Error al iniciar SDL: SDL not built with joystick support