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Mesen 0.8.1


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)


0.8.1 - 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.




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