Sega Master System to MarkIII/SMS-J cartridge adapter

A cartridge adapter to play Sega SMS games (non-japanese, 50 pin cartridge) on a MarkIII or Japanese SMS system.

  •  Current version (white)
  •  Front (old version)
  •  Example use (old version)
  •  Example use (old version)


If you own a Sega MarkIII or a Japanese Master System, this adapter enlarges your game library by letting you use non-japanese 50 pin cartridges. Ideal for games without a Japanese version, games you already own, or games difficult/expensive to get from Japan. Also, many titles originating in Japan still support FM sound, so if you have a MarkIII FM sound unit or a Japanese SMS, some games will sound better.

  • Supports 50 pin non-Japanese Master system cartridges.
  • Works on Sega MarkIII and Japanese SMS.
  • Two layer PCB, gold plated.
  • Ready to use, no soldering required.


Buy here

In stock : Ships within 5 business days unless noted otherwise (out of stock, pre-order, holidays, etc).
The raphnet online store will be temporarily closed for one month, from February 26 (2024) to March 26.

All orders placed before this period begins will be shipped normally. (i.e. If you order on February 25 for instance, your order will be shipped on February 26, 27 or 28)

DescriptionSMS to MarkIII cartridge adapter

We normally ship within 5 days (excluding week-ends and holidays) after payment.
Prices are in US dollars and are subject to change without notice.

Download(s) & Link(s)

Adapter schematicmarkIII_to_smd_schematic.png

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Product photo

A cartridge adapter circuit to play SMS games on a Megadrive/Genesis console.

Out of stock