Sega CD / Mega-CD Backup RAM Cartridge
Sega
Why
There’s no units produced with a source and not enough listings. We don’t make things up.The Sega CD, known as Mega-CD in most regions outside North America and Brazil, is a CD-ROM peripheral and format for the Sega Genesis produced by Sega as part of the fourth generation of video game consoles. Originally released in Japan on December 12, 1991, it came to North America on October 15, 1992, and the rest of the world in 1993. The Sega CD plays CD-based games and adds hardware functionality such as a faster CPU and a custom graphics chip for enhanced sprite scaling and rotation. It can also play audio CDs and CD+G discs. Sega sought to match the capabilities of the competing PC Engine CD-ROM² System, and partnered with JVC to design the Sega CD.
For now, in English only. Source: Wikipedia, CC BY-SA 4.0How to tell them apart
1 Mbit battery-backed RAM cartridge, plugs into the console's cartridge/card port to extend the built-in 64 Kbit backup memory.
Details from sources
Released near the end of the system's life (GamePro #83, August 1995, via en.wikipedia); en.wikipedia also cites a sega.jp 'Mega CD RAM' page (sega.jp/fb/segahard/mcd/backup.html) that could not be read directly this session (403 to scripts, not in the local cache). The mega-drive models.json entry for the NA Mega-CD 2 console gives 'MK-4101 box / 4102 unit' as the CONSOLE's own code (Sega Retro, from an earlier session) - that code belongs to the console, not this cartridge, so it is not reused here; model_code left null for the cartridge itself.
Data source: en.wikipedia.org
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