NullDC

NullDC is an Open Source Sega Dreamcast and NAOMI Emulator for Windows Operating Systems.  NullDC requires DirectX 9.0c, Visual C++ runtime libraries and you have the option to utilize WinPcap for modem emulation.  Some BIOS files are also needed.  Also, if you want to use a gamepad, be sure to use a separate program to map the buttons as NullDC does not have internal support for this. NullDC uses plugins with several implementations for graphics, reading burned CD-Rom games, sound, and disk image files or memory cards.  NullDC supports the ability to load different plugins for different emulator elements as well which means you could emulate a small LCD screen that shows integrated images right on the console controller itself if you wanted.  

NullDC is a powerful emulation tool for those wanting to experience the older games of the Sega Dreamcast and NAOMI Emulator. The vast collection of games available to you makes this a must-have for anyone looking for the nostalgia of the SEGA Dreamcast and you can play from the comfort of your own personal computer.  

Features:

Highest Compatibility Emulator for Sega Dreamcast and NAOMI

• Highest Compatibility 
• Support for GamePads
• Allows for outside Author Contributions
• Supports Stereoscopy for NVIDIA stereo 3d drivers
• Fog Effect emulation
• Support for Dreamcast VMU
• Experimental DSP sound effects

NullDC is not currently still in development or being supported by the developer.  However, as it is an OpenSourced tool, it is still a working Emulator that is supported by the community.  GitHub has several resources regarding any issues that may arise when utilizing this tool.  If you are interested in Dreamcast Emulation, then NullDC is the best.  If you are interested in playing games such as Shenmue, Crazy Taxi, Soul Calibur, Dynamite Cop and more, then this is the emulator for you!  In most cases, the games will look even better than on the original console.