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Mesen 0.4.1


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)


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.






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