This release adds preliminary Nintendo / Famicom emulation. It´s only a week or two old, so a lot of work still needs to be done before it can compete with the most popular NES emulators.

It´s important to clarify: bsnes is primarily an SNES emulator. That will always be its forte and my core focus. I have added Game Boy support previously for Super Game Boy emulation, and I´ve added NES support mostly for something fun to work on to break up the monotony of working on one system for seven years now. Obviously, I´d like the emulation to be accurate and highly compatible, but I simply cannot afford to invest the same amount of time and money into any other systems.

Still, either way the NES and GB emulation serve as fun side-diversions, and allow for a unified emulator interface with all of bsnes´ unique features applied to all systems. My personal favorite feature is mightymo´s extended built-in cheat code database that now also includes NES and Game Boy codes. And it even works in Super Game Boy mode now, too!

I´m also not worried about speed at all: so long as NES/GB are faster than SNES/compatibility, it´s fine by me. Note that due to the NES audio running at 1.78MHz, and Game Boy audio at 4MHz stereo, a more sophisticated audio resampler was needed: Ryphecha (Mednafen author) has graciously written a first-rate resampler: it is a band-limited Kaiser-windowed polyphase sinc resampler. It is combined with two highpass filters to remove DC bias. The filter itself is SSE optimized, but even still, approximately 50% of CPU usage for NES/GB emulation goes to the audio filtering alone. However, you now have the best sound possible for NES and Game Boy emulation as a result.

The GUI has also been heavily re-structured to accommodate multiple emulators from the same interface. As such, it´s quite likely a few bugs are still lurking here and there. Please report them and I´ll iron them out for the next release.

Changelog:

• license is now GPLv3
  
• re-structured GUI as a multi-system emulator
  
• added NES emulation [byuu, Ryphecha]
  
• added NES ICs: MMC1, MMC2, MMC3, MMC4, MMC5, VRC4, VRC6+audio, VRC7, Sunsoft-5B+audio, Bandai-LZ93D50
  
• added NES boards: AxROM, BNROM, CNROM, ExROM, FxROM, GxROM, NROM, PxROM, SxROM, TxROM, UxROM
  
• Game Boy emulation improvements [Jonas Quinn]
  
• SNES core outputs full 19-bit color (4-bit luma included) for more accurate color reproduction (~5% speed hit)
  
• audio resampler is now a band-limited polyphase resampler [Ryphecha]
  
• cheat database includes NES+GB codes as well [mightymo, tukuyomi]
  
• lots of other changes