Sega Master System BIOS Mod Kit


Mod Kit Includes:

  • 28-Pin BIOS
  • High Quality DIP Socket


  • Master System 2 – 171-5922A
  • Others to be confirmed but should work in all 28pin BIOS consoles
SKU: KIT-SMS-BIO Categories: , ,


A replacement or additional 28-Pin BIOS for the Sega Master System which will fit some models of Master System 1 & 2. This can be programmes with a Japanese BIOS to work with my BIOS support mod kits to switch to a Japanese mode when piggybacked on the native BIOS chip, or it can be programmed with the Master System boot loader.

More details and availability coming very soon.

Additional information

Product Type

Mod Kit

Console Make


Console Model

Master System

BIOS Version

Japanese 2.1, Boot Loader, US/EUR v1.3

Mod Attribute



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