For lr-reicast and reicast cores, place the following BIOS files in BIOS/dc folder:
- dc_boot.bin
- dc_flash.bin
- naomi_boot_jp.bin (epr-21576h.bin from naomi.zip used in Demul)
- naomi_boot_us.bin (epr-21577e.bin from naomi.zip used in Demul)

For more information visit: https://github.com/Retro-Arena/RetroPie-Setup/wiki/How-to-run-Dreamcast,-Naomi-and-Atomiswave-games-on-lr-reicast%3F


* A MAME format BIOS file (naomi.zip) from a recent (post 0.154) MAME build can be used instead of naomi.bin