A good open source FC simulator- VirtualNES, this is the v0.97 version of the source code files, useful for learning.

VirtuaNES.v0.97.Full.Source
...........................\CheatCode
...........................\.........\Castlevania (E).gen
...........................\.........\SpartanX.vct
...........................\.........\Super Mario Bros (E).gen
...........................\Doc
...........................\...\AVIconv_E.txt
...........................\...\Cheat_E.txt
...........................\...\ExtSound_E.txt
...........................\...\History_E.txt
...........................\...\Mappers.txt
...........................\...\NetPlay_E.txt
...........................\...\Readme_E.txt
...........................\English.vlp
...........................\Ips
...........................\Source
...........................\......\AboutDlg.cpp
...........................\......\AboutDlg.h
...........................\......\App.cpp
...........................\......\App.h
...........................\......\Archive.cpp
...........................\......\Archive.h
...........................\......\AviConvDlg.cpp
...........................\......\AviConvDlg.h
...........................\......\AviWriter.cpp
...........................\......\AviWriter.h
...........................\......\ChatDlg.cpp
...........................\......\ChatDlg.h
...........................\......\CheatDlg.cpp
...........................\......\CheatDlg.h
...........................\......\CHyperLink.h
...........................\......\Com.cpp
...........................\......\Com.h
...........................\......\Config.cpp
...........................\......\Config.h
...........................\......\ControllerDlg.cpp
...........................\......\ControllerDlg.h
...........................\......\Crclib.cpp
...........................\......\Crclib.h
...........................\......\DatachBarcodeDlg.cpp
...........................\......\DatachBarcodeDlg.h
...........................\......\DebugOut.cpp
...........................\......\DebugOut.h
...........................\......\DipSwitchDlg.cpp
...........................\......\DipSwitchDlg.h
...........................\......\DirectDraw.cpp
...........................\......\DirectDraw.h
...........................\......\DirectInput.cpp
...........................\......\DirectInput.h
...........................\......\DirectSound.cpp
...........................\......\DirectSound.h
...........................\......\Doc
...........................\......\...\Copying.txt
...........................\......\...\ReadmeSrc.txt
...........................\......\EmulatorDlg.cpp
...........................\......\EmulatorDlg.h
...........................\......\EmuThread.cpp
...........................\......\EmuThread.h
...........................\......\ExtSoundFile.h
...........................\......\FolderDlg.cpp
...........................\......\FolderDlg.h
...........................\......\GameOptionDlg.cpp
...........................\......\GameOptionDlg.h
...........................\......\GraphicsDlg.cpp
...........................\......\GraphicsDlg.h
...........................\......\hq2x.h
...........................\......\interp.h
...........................\......\JoyAxisDlg.cpp
...........................\......\JoyAxisDlg.h
...........................\......\LanguageDlg.cpp
...........................\......\LanguageDlg.h
...........................\......\LauncherDlg.cpp
...........................\......\LauncherDlg.h
...........................\......\lq2x.h
...........................\......\lzAscii.h
...........................\......\lzSight.h
...........................\......\lzTVlayer.h
...........................\......\Macro.h
...........................\......\MainFrame.cpp
...........................\......\MainFrame.h
...........................\......\MemoryView.cpp
...........................\......\MemoryView.h
...........................\......\MMTimer.cpp
...........................\......\MMTimer.h
...........................\......\MovieDlg.cpp
...........................\......\MovieDlg.h
...........................\......\MovieInfoDlg.cpp
....

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