FM-Pak Schematics

ZIP File containing EAGLE design to build your own FM-PAK.

FS-A1FX Rom with FM Music and no Cockpit

A FS-A1FX System Rom without the Cockpit software, but with FM-Music added.

Article belonging to this download.

Hardware Howto Music

Philips Music Module Upgrade and Capacitor Replacement

Last MSX Fair in Tilburg I’ve bought the MSX Audio Extension Expander from Bas Kornalijnslijper.

This extension comes with an online build-in instruction that can be downloaded from Supersoniqs Website
The instruction starts with a little background:

Back in 2005 Brazilian MSX users Fábio Ricardo Schmidlin (FRS) and Luciano Sturaro
(MSXPró) released an expander PCB for the Philips Music Module. This board came with
and adjusted Panasonic MSX Audio ROM and with 256KB sample memory. A while ago
FRS published his schematics so other MSX users could recreate his upgrade PCB.
Because nobody took this challenge while there was still demand SuperSoniqs jumped in.
It took us some months to gather all the necessary parts, order the PCB’s and then find a
partner to assemble the upgrade boards. After some setbacks we finally succeeded. We
would like to thank FRS and MSXPró for their great work. They can be reached through Please check our site for news and information about our products.
Our place on the web can be found at We hope you have great fun with
this upgrade!

The upgrade can be done in some easy steps, but since I had to open up my Music Module I decided to also replace all electrolytic capacitors with high-grade audio electrolytic capacitors.
So I started to identify all capacitor values to order them. The following electrolytic capacitors ar used in the Music Module: Value Volt
C41 0.47uF 50V
C13 100uF 16V
C16 100uF 16V
C29 100uF 16V
C30 100uF 16V
C25 10uF 16V
C38 10uF 16V
C39 10uF 16V
C40 10uF 16V
C21 1uF 50V
C33 1uF 50V

I removed all electrolytic capacitors by cutting them out and then cleaned all holes using a desoldering pump.

Then I’ve put all new electrolytic capacitors.

After replacing all electrolytic capacitors I’ve tested the music module to see if it’s still functioning and to listen to the result. The result was not stunning, but the sound was somehow more ‘bright’.



I also replaced R41 with a 20KΩ potentiometer, so the sound output to the slotconnector can be adjusted.

After these modifications I started to build in the MSX Audio Extension Expander using the guide supplied by Supersoniqs.


The result:











Because I have multiple Music Modules with different ROM’s I have dumped them all using my Wellon VP-280 Eprom programmer and added them to the downloads section:


FM-Pak Design

Six years ago I made a FM-Pak design in EAGLE, to make it possible to produce your own FM-PAK. Until now I did not publish it on my own site.

Now it is available for download.


FM-Pak Design


FSA1-FX Close-Up pictures (Mainboard/MSX Music / RAM)

Before selling my FSA1-FX Machine I’ve made some close-up pictures of it. Including the upgrades I’ve done on this machine.

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Adding MSX-Music to a FS-A1FX

Today I finished building MSX-Music (based on a YM2413) into my FS-A1FX

Here is a Demo Video where you can hear the difference.

On this picture the extra circuit I’ve added to get the FM-Sound.

2013-06-15 12.36.43


Only thing left is to add the WSX Music ROM to my machine. To test the functionality I’ve flashed a flashrom with the WSX Music Rom and it is working, as you have seen in the video.

To add the circuit, I used this part of the Service Manual of a FS-A1WSX:



The partslist:

IC5 YM2413
C10 0.015uF
C11 0.015uF
C12 50V 1uF
C46 50V 2.2uF
C9 0.1uF

R27 2.2K
R28 2.2k
R29 4.7k
R30 4.7k
R72 47k
R73 47k
R74 330k
R89 47k

I’ll update this post, when I have the Music ROM build-in also.