bsnes v083 released - 模擬器

http://byuu.org/

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
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