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Mesen 0.5.0


Mesen is a NES/Famicom emulator and NSF player. It is still a work in progress - some features are currently incomplete or may change in future versions.




  • Other Features: 7z/zip archive support, numerous video filters (xBRZ, Scale2x, NTSC, etc.), sound recorder, sound effects, etc.
  • Stand-alone - Put the Mesen application into any folder and run it from there
  • Automatic updates - Mesen is able to check for updates and automatically install new versions of itself.
  • Built-in Debugger
  • Net Play - Play online with friends
  • Supports: Save States, Movie/Audio Recording, Screenshots, Cheat Codes
  • Support for over 195 mappers
  • NES and Famicom (including Famicom Disk System) support. Also supports: NSF, NSFe, VS System
  • High Accuracy - A lot of effort has gone into making Mesen as accurate as possible


Technical Details


  • Core built in C++ with a C# user interface.
  • Multi-threaded - Emulation, Video Filters, Rendering, Net Play and UI all run in their own threads.
  • Runs in 32-bits or 64-bits mode depending on the operating system, with the same executable file


The name "Mesen" is both a Japanese word (目線 - meaning "point of view" or "a person's gaze") and a terrible pun on the term "NES Emulator": "NES Emulator" → "NES Em" → "Mesen" (backwards)



WARNING: Save states created with version 0.4.1 (or older) will no longer work in 0.5.0.


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.






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