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 Make your Master System a little bit more unique with this prototype BIOS that never made it to systems on the shelves! It contains a really cool boot animation that never gets old.
Originally it only worked with just TWO games, but asynchronous @ SMSpower(.org) has made multiple revisions to make it boot 99.9% of real master system cartridges - you can check the forums there for the technical stuff.

Please inbox me on whether you need it to boot cartridges only or whether you want it to work with game cards as well, as mentioned there are multiple revisions but for a Master System II you would likely want V4.


Included is a 28pin socket so you can switch your BIOS at will - there is also a Japanese 2.1 BIOS available, check my other listings.

**pictured is a board with socketed CPU/ WRAM/ BIOS and a replaced regulator - happy to do the BIOS (middle of 3) for you on a send in, send back basis