This is a NES Emulator.

fixGB Alpha v1.2.7 Changelog:

-added support for mapper 224
-improved vrc7 audio emulation, now volumes behave more accurately
-added newly dumped data for accurate vrc7 instruments
Controls right now are keyboard only and do the following:
Y/Z is A
X is B
A is Start
S is select
Arrow Keys is DPad
Keys 1-9 integer-scale the window to number
P is Pause
B is Disk Switching (for FDS)
O is Enable/Disable vertical Overscan