nullDC is an open source Dreamcast emulator

Builds require Visual C++ 2010 Runtimes, you can fetch them from: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=a7b7a05e-6de6-4d3a-a423-37bf0912db84

All source revisions (and compiled builds of those revisions) are in a constant Work In Progress status unless explicitly stated otherwise.

In simple words, this is pre-alpha quality software at best and various parts in it might be broken at any given time.

If concerned about the reliability, usability and stability of the software as an end-user it's recommended to refrain from using it until BETA, Release Candidate and Stable releases become available.

The issue tracker is for bug reports and feature requests ONLY! User issues not falling into these categories will be ignored, invalidated and/or deleted. If you need help running the emulator then it would be better to seek support on a nullDC related forum such as this one: http://forums.ngemu.com/nulldc-discussion/