This emulator is in the early stages of production, so to speak. The Original NeoCD(DOS Version) is by Martinez Fabrice, and The NEOGEO CD SDL port was done by Fosters (SDL portions written by Fosters(2001, 2003).

You must include the BIOS (512k) on the on the root directory of the CD. Wait till it's loaded 20 sec is good then swaping a game or count 15 secs (there is now a message on the screen that tells you)
What you have to have is a NEOGEO CD game. Boot this up and you will see the boot screen. Open your dreamcast lid, remove the emulator, then place the NEOGEO CD in. Close the dreamcast lid. Wait 30 seconds (or less) just so the GDROM drive spins back up. Then press start. If the game works (for example: puzzle bubble) then about 10 seconds after you will see the game load up.