BassNES v0.4.2 is released. An NES emulator written in Java. The emulator itself is pretty darn accurate. Boasting cycle accuracy and well timed components.

Currently supported mappers:
0,1,2,3,4,5,7,9,10,11,13,19,24,26,71,75,210
These mappers give a good mix of compatibility covering most games for the NES.

Extra Features:
* NSF Player (.nsf only)
* Controller input via Jinput
* Fully Customizable NTSC filter.
* Volume control on a per-channel basis.
* Audio Visualizer with an oscilloscope and piano keyboard
* Save States! (hotkeys are CTRL+(number key) to save and SHIFT+(number key) to load)
* A library version of the BassNES core is provided for inclusion in other projects. It includes everything and provides an interface for video and audio callback in the style of liberto. Documentation included.

System Requirements:
* Minimum 1.2 GHZ dual core for full speed.
Unimplemented (Planned) Features:
* More Mappers!
* FDS support
* Significantly tested PAL support (has experimental support)
* Debugging tools such as a memory, name table and pattern table viewers
* Continued optimization to reach goal of 0.86 GHZ as the minimum dual core cpu speed.

BassNES v0.4.2 Changelog:
UI:
BugFix: More steps taken to prevent crashes with Jinput.
First steps to input recording and playback.
Added hotkeys for quick save/load savestate.
Added hotkeys for input recording and playback.
Redesigned controller configuration window.
Tab for the NSF Player was added to audio settings. Allowing you to set default track length.
Core:
BugFix: Small timing issue with the MMC5 mapper.
Added support for nsfe files!

Download: BassNES v0.4.2
Source: Here