HalfNES is an open-source emulator for the Nintendo Entertainment System, written in Java. Currently, it only runs as a standalone Java SE application and supports: joystick through DirectInput and xInput, SRAM save, accurate sound core, full screen display and cross-platform portability.

Need help? Stop by our forum at EmuTalk.net for some friendly advise.

Current Features:
+ Joystick support through both Direct Input and xInput (thanks Zlika)
+ Supports lots of Mappers
+ SRAM save support (no save states however)
+ Accurate sound core
+ Fast video code with NTSC filter (filter is still slow)
+ Full screen support
+ Cross-platform portable
+ Added options dialog for easier remapping of keys