Authentic bios-cd-u.bin files have known CRC32 and MD5 hashes. For example, a valid Sega CD US BIOS 2.00 has the hash e66fa1dc (CRC32). Emulators like RetroArch will refuse to load a corrupted or incorrectly dumped BIOS. If your emulator crashes at boot, the first step is to verify your .bin hashes against the No-Intro or Redump databases.
The "E" stands for Europe. This BIOS corresponds to the Mega CD units sold in Europe.
: Emulators are often case-sensitive and require specific naming conventions. While your query lists them with hyphens, many popular cores require them to be named with underscores: bios_CD_U.bin bios_CD_E.bin bios_CD_J.bin Verification
| Filename | Region | Video Standard | Typical SHA-1 / MD5 Checksum (Example) | |----------|--------|----------------|------------------------------------------| | bios-cd-u.bin | North America | NTSC | 2efd74e3232ff260e371b99f840324f7 | | bios-cd-e.bin | Europe | PAL | e66fa1dc5820d254611fdcdba0662372 | | bios-cd-j.bin | Japan | NTSC | 278a93b977d2a004f7b0c6cff0dd8db4 |