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Mesen - NES and Famicom Emulator

Mesen LogoMesen

NES and Famicom Emulator

Français 日本語

About

Mesen is a high-accuracy NES and Famicom emulator and NSF player for Windows and Linux.

Features
  • High Accuracy: A lot of effort has gone into making Mesen as accurate as possible.
  • High Compatibility: Over 220 mappers supported (all licensed games supported)
  • NES, Famicom, Famicom Disk System, Dendy, VS System, NSF and NSFe emulation is supported.
  • General: Save States, Rewinding, Movie/Audio Recording, Overclocking, Cheat Codes.
  • Video: Numerous video filters, customizable palettes/overscan, support for HDNes' HD packs.
  • Audio: Stereo effects, per-channel volume and panning, equalizer, etc.
  • Misc: Netplay, 7z/zip support, IPS/BPS patch support, automatic updates, and more!

Downloads

VersionDateLink
0.9.5March 31, 2018Download
Older ReleasesGitHub

System Requirements

Windows

  • Windows Vista, 7, 8, 8.1 and 10 are supported
  • DirectX 11
  • .NET Framework 4.5+

Linux

  • glibc 2.24+
  • Mono 4.2.1+
  • SDL 2

Accuracy Tests

Test roms are programs created to test and validate some of the NES' behavior. They are used by emulators to ensure that the emulated console behaves as much as possible like a NES. While they are not perfect for assessing an emulator's overall accuracy, they still provide a decent estimate. The following tables list the majority of existing test roms and whether or not Mesen passes each test.
Audio
apu_mixer4/4 Pass
dmcPass
noisePass
squarePass
trianglePass
apu_phase_resetPass
apu_reset6/6 Pass
4015_clearedPass
4017_timingPass
4017_writtenPass
irq_flag_clearedPass
len_ctrs_enabledPass
works_immediatelyPass
apu_test8/8 Pass
1-len_ctrPass
2-len_tablePass
3-irq_flagPass
4-jitterPass
5-len_timingPass
6-irq_flag_timingPass
7-dmc_basicsPass
8-dmc_ratesPass
blargg_apu_2005_07_3011/11 Pass
01.len_ctrPass
02.len_tablePass
03.irq_flagPass
04.clock_jitterPass
05.len_timing_mode0Pass
06.len_timing_mode1Pass
07.irq_flag_timingPass
08.irq_timingPass
09.reset_timingPass
10.len_halt_timingPass
11.len_reload_timingPass
dmc_tests4/4 Pass
buffer_retainedPass
latencyPass
status_irqPass
statusPass
fadeout_and_triangle_testsPass
pal_apu_tests11/11 Pass
01.len_ctrPass
02.len_tablePass
03.irq_flagPass
04.clock_jitterPass
05.len_timing_mode0Pass
06.len_timing_mode1Pass
07.irq_flag_timingPass
08.irq_timingPass
09.reset_timingPass
10.len_halt_timingPass
11.len_reload_timingPass
square_timer_div2Pass
test_apu_211/11 Pass
test_1Pass
test_2Pass
test_3Pass
test_4Pass
test_5Pass
test_6Pass
test_7Pass
test_8Pass
test_9Pass
test_10Pass
test_11Pass
test_apu_envPass
test_apu_sweep2/2 Pass
sweep_cutoffPass
sweep_subPass
test_apu_timers4/4 Pass
dmc_pitchPass
noise_pitchPass
square_pitchPass
triangle_pitchPass
test_tri_lin_ctrPass
volume_testsPass
CPU
branch_timing_tests3/3 Pass
1.Branch_BasicsPass
2.Backward_BranchPass
3.Forward_BranchPass
cpu_dummy_readsPass
cpu_dummy_writes2/2 Pass
cpu_dummy_writes_oamPass
cpu_dummy_writes_ppumemPass
cpu_exec_space2/2 Pass
test_cpu_exec_space_apuPass
test_cpu_exec_space_ppuioPass
cpu_interrupts_v26/6 Pass
cpu_interruptsPass
1-cli_latencyPass
2-nmi_and_brkPass
3-nmi_and_irqPass
4-irq_and_dmaPass
5-branch_delays_irqPass
cpu_reset2/2 Pass
ram_after_resetPass
registersPass
cpu_timing_test6Pass
dma_sync_test2/2 Pass
dma_sync_testPass
dma_sync_test_oddPass
dmc_dma_during_read45/5 Pass
dma_2007_readPass
dma_2007_writePass
dma_4016_readPass
double_2007_readPass
read_write_2007Pass
dpcmletterboxPass
instr_misc5/5 Pass
instr_miscPass
01-abs_x_wrapPass
02-branch_wrapPass
03-dummy_readsPass
04-dummy_reads_apuPass
instr_test-v317/17 Pass
01-impliedPass
02-immediatePass
03-zero_pagePass
04-zp_xyPass
05-absolutePass
06-abs_xyPass
07-ind_xPass
08-ind_yPass
09-branchesPass
10-stackPass
11-jmp_jsrPass
12-rtsPass
13-rtiPass
14-brkPass
15-specialPass
all_instrsPass
official_onlyPass
instr_timing3/3 Pass
instr_timingPass
1-instr_timingPass
2-branch_timingPass
nestestPass
sprdma_and_dmc_dma2/2 Pass
sprdma_and_dmc_dmaPass
sprdma_and_dmc_dma_512Pass
Video
blargg_ppu_2005_09_15b5/5 Pass
palette_ramPass
power_up_palettePass
sprite_ramPass
vbl_clear_timePass
vram_accessPass
full_palette3/3 Pass
flowing_palettePass
full_palettePass
full_palette_smoothPass
misc_oam_tests5/5 Pass
oam_read_vbl_waitPass
oam_readPass
oam_stressPass
oamtest3Pass
read2004Pass
nmi_sync2/2 Pass
demo_ntscPass
demo_palPass
ppu_open_busPass
ppu_read_bufferPass
ppu_sprite_hit11/11 Pass
ppu_sprite_hitPass
01-basicsPass
02-alignmentPass
03-cornersPass
04-flipPass
05-left_clipPass
06-right_edgePass
07-screen_bottomPass
08-double_heightPass
09-timingPass
10-timing_orderPass
ppu_sprite_overflow6/6 Pass
ppu_sprite_overflowPass
01-basicsPass
02-detailsPass
03-timingPass
04-obscurePass
05-emulatorPass
ppu_vbl_nmi11/11 Pass
ppu_vbl_nmiPass
01-vbl_basicsPass
02-vbl_set_timePass
03-vbl_clear_timePass
04-nmi_controlPass
05-nmi_timingPass
06-suppressionPass
07-nmi_on_timingPass
08-nmi_off_timingPass
09-even_odd_framesPass
10-even_odd_timingPass
scanlinePass
Input Devices
allpadsPass
PaddleTest3Pass
read_joy34/4 Pass
count_errorsPass
count_errors_fastPass
test_buttonsPass
thorough_testPass
ruderPass
vaus-testPass
Mapper-specific tests
bntest3/3 Pass
bntest_aoromPass
bntest_hPass
bntest_vPass
FdsIrqTestsV7Pass
FME73/3 Pass
fme7acktestPass
fme7ramtestPass
fme7ramtest_128kPass
holydiver24/24 Pass
M0_P32K_C8K_VPass
M1_P128KPass
M1_P128K_C128KPass
M1_P128K_C128K_S8KPass
M1_P128K_C128K_W8KPass
M1_P128K_C32KPass
M1_P128K_C32K_S8KPass
M1_P128K_C32K_W8KPass
M1_P512K_S32KPass
M1_P512K_S8KPass
M2_P128K_VPass
M3_P32K_C32K_HPass
M4_P128KPass
M4_P256K_C256KPass
M7_P128KPass
M9_P128K_C64KPass
M10_P128K_C64K_S8KPass
M10_P128K_C64K_W8KPass
M28_P512KPass
M34_P128K_HPass
M66_P64K_C16K_VPass
M78.3_P128K_C64KPass
M118_P128K_C64KPass
M180_P128K_HPass
HomebrewMappers9/9 Pass
31_test_16Pass
31_test_32Pass
31_test_64Pass
31_test_128Pass
31_test_256Pass
31_test_512Pass
31_test_1024Pass
GTROM CHR-RAM testPass
test28Pass
MMC37/7 Pass
1-clockingPass
2-detailsPass
3-A12_clockingPass
4-scanline_timingPass
5-MMC3Pass
6-MMC3_altPass
mmc3bigchrramPass
MMC52/2 Pass
mmc5exramPass
mmc5test_v2Pass
Submappers12/12 Pass
2_test_0Pass
2_test_1Pass
2_test_2Pass
3_test_0Pass
3_test_1Pass
3_test_2Pass
7_test_0Pass
7_test_1Pass
7_test_2Pass
34_test_1Pass
34_test_2Pass
seromPass
VRC2-49/9 Pass
vrctest21s1Pass
vrctest21s2Pass
vrctest22Pass
vrctest23s1Pass
vrctest23s2Pass
vrctest23s3Pass
vrctest25s1Pass
vrctest25s2Pass
vrctest25s3Pass
VRC62/2 Pass
vrc6test24Pass
vrc6test26Pass
Test results: 246 / 246 (100%)
Note that there are some caveats to using test roms - a higher result does not always mean better emulation or compatibility. These tests do not test every aspect of the NES, and some tests only validate some very specific edge cases in the hardware that games do not rely on. A high (or even perfect) rating on these tests does not imply that Mesen's emulation is perfect (it is not).

Note: Some tests are currently not included in this list because their behavior on real hardware needs to be validated.

Supported Mappers

Each mapper number represents a different cartridge type. Not all mappers are as important - some are used by hundreds of games, others are used by a single game. For example, mapper #4 is used by over 500 licensed games, while mapper #9 is used by a single game. Not all numbers from 0 to 255 have been assigned to specific cartridge models - some are still unused (gray).
iNES
0123456789101112131415
16171819202122232425262728293031
32333435363738394041424344454647
48495051525354555657585960616263
64656667686970717273747576777879
80818283848586878889909192939495
96979899100101102103104105106107108109110111
112113114115116117118119120121122123124125126127
128129130131132133134135136137138139140141142143
144145146147148149150151152153154155156157158159
160161162163164165166167168169170171172173174175
176177178179180181182183184185186187188189190191
192193194195196197198199200201202203204205206207
208209210211212213214215216217218219220221222223
224225226227228229230231232233234235236237238239
240241242243244245246247248249250251252253254255
01234567
89101112131415
1617181920212223
2425262728293031
3233343536373839
4041424344454647
4849505152535455
5657585960616263
6465666768697071
7273747576777879
8081828384858687
8889909192939495
96979899100101102103
104105106107108109110111
112113114115116117118119
120121122123124125126127
128129130131132133134135
136137138139140141142143
144145146147148149150151
152153154155156157158159
160161162163164165166167
168169170171172173174175
176177178179180181182183
184185186187188189190191
192193194195196197198199
200201202203204205206207
208209210211212213214215
216217218219220221222223
224225226227228229230231
232233234235236237238239
240241242243244245246247
248249250251252253254255
Legend
4 Supported mapper
0 Unsupported Mapper (Licensed games)
124 Unsupported Mapper (Bootlegs)
55 Unknown Mapper (no known games)
129 Unused Mapper

Stats
295 mappers supported
15 mappers unsupported (Bootlegs)
UNIF
BMC-10-24-C-A1 BMC-11160 BMC-12-IN-1 BMC-13in1JY110 BMC-190in1 BMC-411120-C BMC-60311C BMC-64in1NoRepeat BMC-70in1 BMC-70in1B BMC-8-IN-1 BMC-80013-B BMC-81-01-31-C BMC-810544-C-A1 BMC-8157 BMC-830118C BMC-A65AS BMC-BS-5 BMC-D1038 BMC-F-15 BMC-F15 BMC-FK23C BMC-FK23CA BMC-G-146 BMC-GS-2004 BMC-GS-2013 BMC-Ghostbusters63in1 BMC-HP898F BMC-HPxx BMC-NTD-03 BMC-NovelDiamond9999999in1 BMC-Super24in1SC03 BMC-T-227-1 BMC-T-262 BMC-WS BTL-MARIO1-MALEE2 DREAMTECH01 KS7031 LE05 LH53 SSS-NROM-256 UNL-158B UNL-3D-BLOCK UNL-43272 UNL-8237A UNL-AC08 UNL-AX5705 UNL-BB UNL-CC-21 UNL-CITYFIGHT UNL-Coolboy UNL-DANCE2000 UNL-DRAGONFIGHTER UNL-DRIPGAME UNL-EDU2000 UNL-EH8813A UNL-KOF97 UNL-KS7010 UNL-KS7012 UNL-KS7013B UNL-KS7016 UNL-KS7017 UNL-KS7030 UNL-KS7037 UNL-KS7057 UNL-LH10 UNL-MALISB UNL-OneBus UNL-PEC-586 UNL-RT-01 UNL-SA-9602B UNL-SB-2000 UNL-SHERO UNL-SMB2J UNL-T-230 UNL-TC-U01-1.5M UNL-TF1201 UNL-Transformer UNL-VRC7 UNL-YOKO WAIXING-FS005

Contact

Email:
If you are having issues with the emulator, please post a bug report.

Changelog

0.9.5 - March 31, 2018

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Debugger: Tons of new features, UI improvements, performance improvements and bug fixes.
  • HD Packs: New features, performance improvements and bug fixes.
  • FDS: Improved compatibility of the automatic disk insertion feature.
  • UI: Added a few minor options (and increased the number of savestate slots to 10).

Bug Fixes

  • Input: Changed input polling timing to reduce input lag by 1 frame.
  • Linux: Improved SDL error handling to prevent crashes.
  • Accuracy: Fixed a mirroring issue with mapper 30 games.
0.9.4 - December 29, 2017

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Input: Added support for 20 more peripherals (including controllers, barcode readers, keyboards, mice, external storage devices, etc.)
  • Video: Added a 60.0 FPS mode to reduce dropped frames
  • Video: Added support for exclusive fullscreen mode (Windows only)
  • Video: Added option to rotate the display (for homebrew games)
  • Performance: Minor performance enhancements on Windows (~5%) and large gains on Linux by enabling LTO (25-30%)
  • Movies: Rewrote movie file format from scratch to be a lot more flexible, and editable by hand. (Old .mmo files are no longer supported)
  • Debugger: Several enhancements and a number of additions/changes to the Lua API.
  • Accuracy: Improved FDS IRQ emulation

Bug Fixes

  • General: Several miscellaneous bugs have been fixed.
  • Debugger: A large number of small bugs and usability issues have been fixed.
  • HD Packs: Fixed performance issues with HD Packs in CHR RAM games (over 2x faster)
0.9.3 - September 8, 2017

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • UI: All UI shortcuts are now customizable in the Preferences (multi-key shortcuts are now supported).
  • UI: Added a link to the new online documentation site in the Help menu.

Bug Fixes

  • Cheats: Fixed crash when cheats window was opened
  • HD Packs: Fixed sprite recording in HD Pack Builder and crashes when loading HD packs in some conditions.
  • Debugger: Fixed some minor bugs.
  • Linux: Fixed some crashes and layout fixes.
  • Dendy: Fixed regression bug with intensify color and grayscale bits emulation.
0.9.2 - September 2, 2017

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • UI: Added an initial setup dialog for new users.
  • UI: Ability to configure paths and portable mode in preferences.
  • HD Packs: New features, bug fixes and audio replacement support.
  • Input: Added support for the Famicom's second controller's microphone.
  • Savestates: Added ability to save/load the state to/from any file.
  • Debugger: Added Lua scripting.
  • Debugger: Assembler now has syntax highlighting.
  • Debugger: Integration with ASM6 via freem's fork (ASM6f) to import labels and code comments.
  • Debugger: Added iNES header editor
  • Debugger: PPU viewer enhancements
  • Debugger: Added "Developer mode" option for quicker access to debugging tools
  • NSF: Added repeat and shuffle options
  • General: Improved emulator startup performance

Bug Fixes

  • UI: Fixed window size not being remembered correctly in some cases
  • FDS: Bug fixes related to cheats and save data
  • Debugger: Fixed watch window usability issues and assembler bugs
0.9.1 - August 6, 2017

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • HD Packs: Improved support for HDNes' HD packs and added an HD Pack Builder tool.
  • Debugger: Added several new features and options (Step Back, configure input, etc.)
  • Video: Added option to automatically re-enable sprite limit to reduce graphical glitches caused by the "remove sprite limit" option.
  • VS System: The custom color palette can now be applied to VS System games as well.

Bug Fixes

  • Overclocking: Bug fixes and improved compatibility.
  • Cheats: Fixed issue with 8-character Game Genie codes.
  • FDS: Fixed a crash, an issue with automatic disk insertion and improved emulation compatibility.
  • NSF: Fixed issue with MMC5 multiplication register (fixes Just Breed NSF).
  • Others fixes and improvements for the debugger, game selection screen, rewinding, mappers 48/163, a number of unlicensed games and more.
0.9.0 - May 13, 2017

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Rewind: Added a rewind functionality with reverse video and audio playback (up to several hours worth of gameplay can be rewinded.)
  • UI: Added game selection screen
  • Compatibility: Added support for mappers 29, 30, 111, 158 and 174.
  • FDS: Added option to automatically switch disks.
  • Video: Improvements to video scale management and corrected aspect ratio presets.
  • Misc: Added a few other small features (Frame counter, game timer, 96kHz audio, etc.)

Bug Fixes

  • Accuracy: Improvements to PPU, MMC5 and VRC6 emulation.
  • FDS: Fixed issue with sound emulation (Fixes Bio Miracle).
  • Overclocking: Improved compatibility with some games.
  • Debugger: Fixed a number of bugs and crashes.
  • Misc: Several other bug fixes.
0.8.1 - April 15, 2017

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Performance: Code improvements have increased emulation speed by 15-35%.
  • Audio: Added a customizable equalizer.
  • Patches: Added support for UPS and BPS patch formats.
  • Compatibility: Added support for UNIF FK23C/FK23CA/D1038 boards and mapper 104.
  • PPU: Added option to emulate OAM RAM decay.

Bug Fixes

  • PAL: Improved PPU emulation accuracy.
  • MMC5: Improved emulation accuracy.
  • FDS: Improved IRQ emulation accuracy (fixes Lutter and some unlicensed games).
  • Emulation: Fixed problem that caused in-game crashes in the "Legend of Link" romhack.
  • Misc: Several small bug fixes.
0.8.0 - March 24, 2017

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Emulation: Added several new options to enable/disable model-specific quirks.
  • Command line: Added command line options for most video/audio/emulation settings.
  • Debugger: Added several new features (Hex editor, TBL file support, code editor, graphic editor, and a lot more), improved performance and fixed some bugs.
  • Games: Headerless roms can now be loaded (if they are found in the built-in game database).

Bug Fixes

  • Emulation: Improved accuracy of $2006 write behavior (solves minor issues in 2 games).
  • Emulation: Improved accuracy of $2004 read behavior.
  • Emulation: Improved accuracy of sprite overflow bug emulation.
  • Misc: Several small bug fixes.
0.7.1 - February 18, 2017

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Video: Added new custom aspect ratio option.
  • Compatibility: Added support for mapper 190 (Magic Kid GooGoo) and UNIF board EH8813A.
  • Video: Added new codec for AVI recording (camstudio) and compression setting

Bug Fixes

  • FME7: Fixed bug with savestates for mapper 69.
  • Misc: Several small bug fixes.
0.7.0 - December 30, 2016

Happy new year!

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Video: Added new NTSC filter (based on Bisqwit's work).
  • Video: Added feature to allow recording gameplay to AVI files

Bug Fixes

  • Video: Fixed graphic glitches and crashes with the 2xSai, Super2xSai and SuperEagle filters.
  • Startup: Fixed crash that occurred when the path contained non-ascii characters (bug introduced in 0.6.1).
  • Linux: Fixed an issue with the "only allow one instance of Mesen" option.
0.6.1 - December 24, 2016

Happy holidays!

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Linux: Mesen can now run under Linux (requires Mono and SDL2). This is still a work in progress and may contain bugs and crashes.
  • UI: Mesen is now available in Portuguese (translation by ThallesAps)

Bug Fixes

  • Audio: Improved square channel accuracy and fixed a sound mixing bug introduced in 0.6.0.
  • Misc: Fixed issues with DirectInput controllers and the debugger.
  • Overclocking: Fixed issues when using overclocking in games that use the DMC channel.
0.6.0 - December 10, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Debugger: Tons of new features and improvements (including labels and comments, a profiler, more options in the PPU viewer, etc.)
  • Audio: Greatly reduced sound latency.
  • Audio: Added an option to reduce the popping sounds produced by the DMC channel in some games.
  • Audio: Added channel panning options.
  • Audio: Added a crossfeed option.
  • Video: Added 2 new palette presets (Nostalgia and Nes Classic, by FirebrandX).
  • UI: Added a "power cycle" option to reload the current game.
  • UI: Added an option to load a random game.

Bug Fixes

  • Video: Fixed a bug with the "Remove Sprite Limit" option that could cause it to display incorrect sprites on the screen.
  • Video: Fixed a bug with the aspect ratio option when overscan was used at the same time.
  • NSF: Fixed a crash that could occur when loading incorrect NSF files.
0.5.3 - November 12, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Compatibility: Added support for 4 new mappers (43, 54, 125, 236)
  • Compatibility: Added support for 40 new UNIF boards.
0.5.2 - October 30, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Compatibility: Added support for 6 new mappers (83, 126, 199, 215, 217, 220)
  • UNIF: Added support for CoolBoy boards.
  • Video: Added a few options in the advanced tab.

Bug Fixes

  • Accuracy: Improved IRQ timing for FDS emulation - fixes "Druid - Kyoufu no Tobira".
  • Accuracy: Fixed issues with mapper 245 games.
  • Debugger: Various bugfixes.
0.5.1 - September 7, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

Bug Fixes

  • Google Drive: Fixed a crash that could occur when enabling Google Drive integration.
  • Debugger: Fixed a crash introduced in 0.5.0 that could occur when opening the debugger.
0.5.0 - September 5, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Input: Added key presets for typical keyboard layouts and controllers (Xbox, PS4, etc.)
  • Input: Several emulator functions can now be mapped to controller buttons (e.g: fast forward, save state, etc.)
  • Save states: Added automatic save state option.
  • UI: Mesen is now available in Ukrainian.　(translation by Arcus87)
  • Debugger: Added cpu/ppu mapping display and improved several features (Memory Viewer, Trace Logger, CHR Viewer).
  • Compatibility: Added support for 3 new mappers (123, 134, 216)

Bug Fixes

  • Crash: Fixed a crash that could occur when exiting Mesen.
0.4.3 - August 29, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Game DB: Updated game database to use the latest version of NesCartDB.

Bug Fixes

  • NetPlay: Fixed a crash introduced in 0.4.2 that occurred when connecting to a server.
  • Gameplay: Screensavers will no longer turn on while playing games with a DirectInput controller.
  • Cheats: Fixed an issue that could occur when importing some CHT cheat files.
  • Cheats: Fixed issues that could occur when applying large numbers of cheats.
0.4.2 - August 27, 2016

WARNING: Save states created with previous versions will no longer work in 0.4.2.

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • UNIF: Added support for UNIF files.
  • Cheats: Added a built-in cheat database containing cheats for over 750 games.
  • Cheats: Cheat window has been reworked and added support for FCEUX (.CHT) and Nestopia (.XML) cheat file formats.
  • Compatibility: Added support for 7 new mappers (105, 106, 117, 162, 186, 196, 219)

Bug Fixes

  • IPS: Fixed a number of issues with IPS files.
  • Accuracy: Improved IRQ timing for RAMBO-1 chip (Mapper 64) - improves Skulls and Crossbones.
  • Accuracy: Fixed issues with Gradius II, Crisis Force and Cosmo Police Galivan.
  • NSF: Fixed sound tempo in Dendy mode.
0.4.1 - August 13, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Compatibility: Added support for 18 new mappers (114, 120, 121, 136, 168, 183, 188, 204, 213, 214, 222, 229, 233, 238, 244, 253, 254, 255)
  • Compatibility: Improved support for NES 2.0 headers.
  • Input: Added support for the Oeka Kids Tablet.
  • MMC1: Fixed issues with some games and added support for RAM read/write protection.
  • MMC3: Added support for ram read/write protection.

Bug Fixes

  • Audio: Fixed a bug in the square channel's sweep units - fixes audio distortion in some games.
  • Input: Fixed limitations with keyboard input and fixed an issue with XInput controllers.
  • Cheats: The "Delete Selected Cheats" button now works.
  • Video: Loading a game while in fullscreen mode no longer resets the video scale.
0.4.0 - July 24, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Compatibility: Added support for 26 new mappers (14, 35, 36, 41, 51, 53, 63, 90, 96, 103, 108, 165, 166, 167, 178, 187, 197, 209, 211, 212, 221, 234, 235, 245, 249, 250)
  • UI: Mesen is now available in Russian (translation by Matich)
  • UI: Mesen is now available in Spanish (translation by Juan Ramón Martínez)
  • Input: Added option to display controller input on the screen.
  • Audio: Added option to reduce popping sounds produced by the triangle channel in some games.

Bug Fixes

  • DirectX: Fixed a crash that occurred when loading a ROM on some computers.
  • NSF: Fixed a crash when attempting to take screenshots and improved the silence detection code.
  • CNROM (Mapper 3): Enable bus conflicts for standard CNROM boards (fixes Cybernoid - The Fighting Machine)
0.3.2 - July 17, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Compatibility: Added support for 20 new mappers (28, 31, 40, 42, 46, 48, 50, 56, 132, 133, 142, 170, 171, 172, 173, 175, 177, 179, 182, 252)
  • Input: DirectInput controllers/joysticks (e.g: PS4 controller, etc.) are now supported.
  • Overclocking: Added a lag counter like the one present in FCEUX and puNES.
  • Sunsoft 4: Improved compatibility for this mapper.

Bug Fixes

  • Audio: Fixed a bug in the square channel's sweep units - fixes audio distortion in some games.
  • Open Bus: Improved open bus implementation.
  • VS System: Fixed a palette bug that could occur after loading VS System games.
  • VRC4: Fixed a bug that was causing TMNT2 (J) to crash.
0.3.1 - July 10, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • VRC7: Added VRC7 audio support.
  • MMC5: Added vertical split mode support.
  • Game DB: Automatically select appropriate controllers when loading a recognized game.
  • VS System: Improved default settings for all games (fixes palette and input mapping issues).

Bug Fixes

  • Preferences: Options in the Advanced tab are now visible again.
  • VS System: Fixed a bug that prevented Gumshoe from booting.
0.3.0 - June 26, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • NSF: Added support for NSF and NSFe sound files.
  • Compatibility: Added support for 24 new mappers (6, 8, 16, 17, 86, 137, 138, 139, 141, 143, 144, 150, 151, 153, 155, 156, 157, 159, 164, 176, 218, 227, 228, 243)
  • Game DB: Added a built-in game DB to automatically fix incorrect iNES headers.
  • Archives: Added support for 7-Zip (7z) files and support for archives (zip/7z) containing multiple roms.
  • Tools: Added a log window tool (Tools menu)

Bug Fixes

  • VS System: Fixed freezes in TKO Boxing, RBI Baseball and Super Devious.
  • Debugger: Various bugfixes and a few improvements.
0.2.2 - June 12, 2016

WARNING: Save states created with previous versions will no longer work in 0.2.2.

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Overclocking: It is now possible to overclock (and underclock) the CPU.
  • Compatibility: Added support for Namco 163/175/340 (Mapper 19 and 210)
  • Compatibility: Added support for Sunsoft FME-7/5A/5B (Mapper 69)
  • Audio: Added expansion audio support for MMC5, Namco 163, Sunsoft 5B and VRC6.

Bug Fixes

  • MMC5: Fixed a regression introduced in 0.2.1 that broke Just Breed.
0.2.1 - June 6, 2016

WARNING: Save states created with previous versions will no longer work in 0.2.1.

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Audio: Added the ability to record sound to WAV files.
  • NES 2.0: Added support for multiple submappers.
  • Debugger: Added a number of new features.

Bug Fixes

  • Accuracy: Improved PPU accuracy - fixes Kick Master.
  • Accuracy: Improved IRQ timing for RAMBO-1 chip (Mapper 64) - fixes Hard Drivin' and Skulls and Crossbones.
  • Audio: Fixed a bug with low frequencies on the triangle channel.
  • Audio: Fixed sound issues when using low volume levels in the sound mixer.
  • PAL/Dendy: Fixed timing issues with the PPU.
0.2.0 - May 27, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Cloud Saves: Added Google Drive integration - allows backup of save data and syncing across multiple computers.
  • Video: Added multiple video filters (xBRZ, Scale2x, HQX, 2xSai, Super2xSai, SuperEagle).
  • Video: Added configuration for brightness, contrast, saturation and hue.
  • Video: Added configuration options for the NTSC filter.
  • Video: Added palette presets and option to export palette to .PAL file.

Bug Fixes

  • Crash: Fixed a crash that could occur on some systems during gameplay.
0.1.4 - May 19, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Compatibility: Added support for mapper 15 and 60.

Bug Fixes

  • Audio/Video: Improved emulation accuracy.
0.1.3 - May 2, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

Bug Fixes

  • Startup: Fixed a number of bugs that could crash the application on startup.
0.1.2 - April 30, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • UI: Mesen is now available in English, French and Japanese.
  • Compatibility: Added basic support for VS Unisystem games. (Mapper 99)
  • Compatibility: Added support for mapper 82 and 241.
  • Audio: Added customizable fake stereo effects.
  • Audio: Added option to swap Square 1 and Square 2's duty cycles.

Bug Fixes

  • Auto-updates: Fixed bug that caused auto-updates to fail (MesenUpdater.exe was missing)
0.1.1 - February 14, 2016

This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.

New Features

  • Input: Arkanoid Controller/Paddle emulation is now available - Both NES and Famicom versions.
  • Debugger: The debugger is now able to disassemble and display instructions that are executed from CPU RAM or Cartridge RAM.

Bug Fixes

  • NetPlay: Fixed connection bugs - Clients should now be able to connect to a netplay server.
  • Input: Fixed issue with standard controllers not working correctly in a very specific case.
  • Timing: (Probably) Fixed timing issue with Battletoads which caused freezes on level 2.
  • Debugger: Fixed a number of usability issues with the 'watch' list.
0.1.0 - February 11, 2016

Initial release.
This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.