#2953
As we all know, almost every video game console's emulator on computer is free to use. Whereas due to copyright issues, the emulator's developer can not provide us with those corresponding BIOS files that play a vital role in the game emulation.

#2544
nullDC is a free, open source 32-bit Sega Dreamcast and Sega NAOMI (arcade edition of Sega hardware) game consoles emulator for Windows, first released in 2006 and discontinued in 2011. While, even compared with its successor - Reicast, nullDC is still a better choice for Dreamcast emulation on Windows.