The Sega Master System Hidden FM Collection 2: Incomplete soundtracks

(For part one please see here)

Did you know that, unlike its Western Counterpart, the Japanese Sega Master System had its own FM soundchip? oh, you did? Well of course to you would – you’re a smart, witty and generally amazing Sega Master System fan.

What you may not know, however, is that due to the Japanese Master System’s abrupt termination, a surprisingly large amount of Western-only Master System games retained FM soundtracks. Rather than take them out, programmers would often simply bury them inside inaccessible bits of game code.



hidden fm

This screen grab is glitchy…like these soundtracks!



A Good Few Years ago, SMS Power! User “Sonic of 8” uncovered a number of action replay codes that would allow these hidden soundtracks to be heard – although only in certain emulators and not on the original hardware.

I’d recently finished creating rom patches for all of the complete soundtracks, so I thought I’d quickly go through and create patches for the games that contain only fragments of sound (one or two finished jingles, or just place holder sounds/drums.) This is really for curious completists only – there are no finished soundtracks here (those are in part one.)



hidden fm

Thwack! I have no idea what i’m doing 🙁



To download the finished patch set please click: here
The package contains the necessary ROM patches, a multiplatform tool for patching the ROMs and a readme to walk you through it.

What’s that? you want to here the soundtracks in action? Knock yourself out. Most soundtrack snippets are recorded from a Japanese Master System:

What do you think of this post?
  • Hop! 

About Fatnick

Hello! How do you do? I'm Fatnick, a chiptune-making ZX Spectrum-loving frog from South London. When not skirmishing, you can find me over at or @Mechafatnick and listen to me on Spotify

Leave a Reply

Your email address will not be published. Required fields are marked *