nullDC-Naomi SVN r55 is released. nullDC-Naomi is an open source NAOMI Arcade System Emulator. It will NOT run Dreamcast games.

nullDC-Naomi SVN Changelog:
r55
drkMaple:

-. 2nd Player NAOMI support by 0vetal0 from r54

Untested, so test.

Download: nullDC-Naomi SVN r55
Source:Here