Sega Master System BIOS M404 (Prototype)

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Title Screen
Sega Master System BIOS M404 (Prototype)
Dump status Released
Dumped by Bock
Released by Bock
Origin EPROM
EPROMs 1x
Game Sega Master System BIOS
System Sega Master System
Genre BIOS
Release date JP Oct 1987
US Sep 1986
EU 1987
Download Sega Master System BIOS M404 (Prototype) (info)

A prototype version of the BIOS featured in an early Sega Master System unit.

Origin