via http://www.aep-emu.de/

The NES emulator HalfNES has been updated to version 0.0.36.

Quote:
0.038 (8/12/2011)
  • Added Action 52 mapper (228)
  • Improved audio quality some more
  • Made the screen repaint even when paused
  • Behind the scenes changes to make things easier to port
  • Some speed improvements as well

If there is a game that you want to play that´s broken or mapper unsupported, let me know!