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

The NES emulator puNES for Linux and Windows (SDL) has been updated.

Quote:
Changelog 0.48
More accurate Zapper emulation (thx tepples). Right button of mouse emulates the pointing of the Zapper outside the TV screen. So, to make a shoot offscreen, you must press the left mouse button while holding down the right.
Added Bilinear filter.
Rearranged the menu filter (Hint: reselect the desired filter and then save the configuration).
Fixed many bugs in opengl codes (now, on fullscreen, aspect ratio is maintained properly).