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Mesen Changelog

What's new in Mesen 0.9.9 Beta

Feb 2, 2020
  • New Features:
  • Run Ahead: Added run ahead support (in Emulation settings)
  • Emulation: Added 2 new options to emulate known PPU hardware bugs
  • Emulation: Added option to emulate CPU/PPU alignments
  • UI: Added load state and save state menus (with previews and timestamps)
  • Mappers: Added support for Study Box roms (.studybox files)
  • UNROM512/GTROM: Added support for self-flashing
  • Debugger: Various fixes and improvements
  • Event Viewer: Improved filtering options and added the ability to display NTSC borders
  • Bug Fixes:
  • CPU: Rewrote DMC and OAM DMA logic to better match hardware behavior/timings
  • CPU: Fixed an issue with NMIs turning into IRQs (when turning the NMI flag off at the wrong moment)
  • PPU: Fixed PPU OAM fetch pattern on pre-render scanline
  • PPU: Fixed some PPU timings to better match hardware
  • MC-ACC: Improved MC-ACC (licensed MMC3 clone) emulation
  • MMC5: Rewrote a large portion of the code to better match hardware behavior and quirks
  • Mappers: Fixed/improved emulation of a number of mappers used by unlicensed games
  • NSF: Fixed an issue that caused problems with some FDS NSF files
  • Linux: Fixed bug when using nvidia's drivers that caused the screen to be completely black

New in Mesen 0.9.8 Beta (Jun 24, 2019)

  • New Features
  • Debugger: General improvements as well as new features/tools (and bug fixes.)
  • NSF: Allow rewinding during NSF file playback and fixed an initilization problem with VRC6 audio.
  • History Viewer: Added a few new features and options, including allowing it to be used with NSF files.
  • Video: Added support for 512-color palette files (for color bit emphasis.)
  • Input: Added options to configure the deadzone size for analog sticks and to hide the mouse cursor when using a zapper.
  • Dip switches: Dip switches can now be configured for all cartridges that use them (instead of being limited to VS System games.)
  • Bug Fixes:
  • APU: Fixed frame counter bug that caused audio to sometimes be paced slightly incorrectly.
  • APU: Fixed DMC power on state to match hardware test results.
  • PPU: Prevent palette updates during horizontal blank when rendering is enabled (to match expected hardware behavior.)
  • Namco 163: Fixed problems with battery save data.
  • Bandai FCG: Added support for EEPROM save data.
  • MMC5: Fixed incorrect attribute data when using fill mode.
  • VRC7: Updated audio instrument values to match the values recently dumped from hardware.
  • AOROM: Fixed power on mirroring state.
  • Misc: Fixed minor bugs in a variety of mappers (including mappers 112, 176, 320 and UNROM512.)

New in Mesen 0.9.7 Beta (Sep 17, 2018)

  • New Features:
  • Debugger: Numerous small features/improvements/bug fixes.
  • UI: Added a Chinese translation for the UI (thanks to L1cardo and owomomo)
  • Bug Fixes:
  • Audio: Fixed minor issues with Sunsoft 5B and Namco 163 sound emulation.
  • Emulation: Fixed frame timing/pacing issues on some computers (fixes unstable FPS and audio issues)
  • Video: Removed black bar (left) and fixed cutoff pixels (right) in NTSC (bisqwit) filter.
  • HD Pack Builder: Fixed a number of crashes when using the HD Pack Builder at the same time as the debugger (and improved performance while recording).

New in Mesen 0.9.5 Beta (Apr 2, 2018)

  • 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).
  • Documentation: An offline version of the documentation is now available.
  • 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.

New in Mesen 0.9.4 Beta (Dec 30, 2017)

  • 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)

New in Mesen 0.9.3 Beta (Sep 9, 2017)

  • 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.

New in Mesen 0.9.2 Beta (Sep 4, 2017)

  • 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

New in Mesen 0.9.1 Beta (Aug 7, 2017)

  • 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.

New in Mesen 0.9.0 Beta (May 15, 2017)

  • 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.

New in Mesen 0.8.1 Beta (Apr 18, 2017)

  • 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.

New in Mesen 0.8.0 Beta (Mar 27, 2017)

  • 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.

New in Mesen 0.7.1 Beta (Feb 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:
  • 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.

New in Mesen 0.7.0 Beta (Feb 24, 2017)

  • 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.

New in Mesen 0.6.1 Beta (Feb 24, 2017)

  • 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.

New in Mesen 0.6.0 Beta (Feb 24, 2017)

  • 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.

New in Mesen 0.5.3 Beta (Feb 24, 2017)

  • New Features:
  • Compatibility: Added support for 4 new mappers (43, 54, 125, 236)
  • Compatibility: Added support for 40 new UNIF boards.

New in Mesen 0.5.2 Beta (Feb 24, 2017)

  • 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.

New in Mesen 0.5.1 Beta (Feb 24, 2017)

  • 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.

New in Mesen 0.5.0 Beta (Feb 24, 2017)

  • 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.

New in Mesen 0.4.3 Beta (Feb 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:
  • 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.

New in Mesen 0.4.2 Beta (Feb 24, 2017)

  • 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.