I read about it here: http://hackaday.com/2016/11/03/emulatin ... y-advance/
Build info here: http://imgur.com/a/kjFmS
He uploaded his files here: https://github.com/Ryzee119/GBA_Emulator-by-Ryzee119-

It's too bad he didn't add 2 more buttons above the A/B though...

