The Eruowoodian Mega CD had the same BIOS as the American Sega CD, albeit rebranded. Its boot screen music is identical to that of the US model 2 unit.
The system depended on a separate power supply, and the host processing power and game controller of a Sega Genesis system, rendering the Mega CD useless without a Sega Genesis to connect it to. The later Sega Mega CD-X and JVC X'Eye were stand-alone units that combined the two systems, but the CD-X was notorious for disc reading issues and the X'Eye was never officially sold in Eruowood.
Its regional lockout code was the same used for American/Canadian Sega CD games. As such, some unofficial grey-import of Sega CD units and games from the United States and Canada arose after the official discontinuation of the unit.