HalfNES v0.051 is released. HalfNES is an open-source emulator for the Nintendo Entertainment System, written in Java. Currently, it only runs as a standalone Java SE application.

Current Features:
- Joystick support through both Direct Input and xInput (thanks Zlika)
- Supports Mapper 0, 1, 2, 3, 4, 5, 7, 9, 10, 11, 19, 21, 22, 23, 24, 25, 26,
- 34, 38, 64, 66, 68, 69, 70, 71, 78, 87, 89, 93, 94, 97, 107, 118, 119, 140, 152,
- 0, 185, 200, 203, 226, 240, 246
- 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

HalfNES v0.051 Changelog:

HalfNES Version Notes: 0.051 (9/17/2012) Many more mappers added for this release. Added Mappers: 15 (100 in 1 Contra Function 16) 33 and 48 (Taito TC0190FMC) 41 (Caltron/Myriad 6 in 1) 58 (Game Star multicart) 60 (reset based 4 in 1) 61 (super 42-in 1) 62 (700 in 1 Multicart) 65 (Irem H-3001) 67 (Sunsoft-3) 72 (Jaleco JF-17) 73 (VRC3) 75 (VRC1) 76 and 206 (Tengen MIMIC-1) 79 (NINA-3) 86 (Jaleco JF-13) 88 (NAMCOT-3433/3443) 92 (Jaleco JF-19) 112 (Chinese MIMIC-1 clone) 113 (NINA-6) 154 (NAMCOT-3453) 182 (Chinese MMC3 clone) 201 (8-in-1, 21-in-1 multicarts) 212 and 213 (9999999-in-1) 214 (Super Gun 20-in-1) 225 (58/64/72-in-1 multicarts) 226 (20-1n-1) 229 (31-in-1) 231 (20 in 1 multicart) 241 (Fan Kong Jing Ying) 242 (Wai Xing Zhan Shi / Dragon Quest VIII board) 244 (Decathlon) 255 (110/115 in 1 multicarts) Other Changes: -Changed decay after key off on VRC7 sound chip -Changed color settings on NTSC renderer and rewrote encoding portion for better speed (64 bit JVM also makes this faster) and no more horizontal bars. -Passes sprite overflow basics test -Fixed reset code to reset mapper before CPU -Rom loader handles games with unusual/incorrect headers more gracefully -APU square wave frequency is now correct (would go out of tune at higher frequencies before) -Full screen mode with maintain aspect ratio on now stretches to fill screen -Added .exe and .sh versions of HalfNES to the standard JAR file to work around systems where JAR files are difficult to make executable.

Download: HalfNES v0.051
Source: Here