- Ensure the neocd bios (called "neocd.bin") is under the bios directory
(it should not be compressed and must be 512kb in size).
- Load the emulator (neocd.elf) using your favorite way.
- Follow the screen instruction and when you see the "Insert a neogeoCD" text,
insert a neogeo cd into your drive, wait a few seconds and press (X) on the pad.
- If all goes well NeoCD/PS2 should detect the game and run it.