0.9.9 - February 1, 2020This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.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 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