So you’ve made an adapter, inserted the SFG-05 the wrong way, blew the YM2148 and need to program an new EPROM? No? well I did once. Fortunately I was able to get the ROM from another CX5M, but you might not be that fortunate.

Until now: I’ve saved the SFG-05 ROM and some software cartridges in case you have similar problems. All ROM images start at 4000h except for the SFG-05 cartridge (which starts at 0000h) Please contact me if you have any additions.

I’ve put the scanned cartridge manuals as well as collected manuals from various places on the internet like yamaha, passionMSX and on Google Drive Google Drive (click to view)

   ROM Name  Size  Screenshot
DMS-II Real Time Sequencer ROM Image
By Abdul H. Ibrahim
DMS-I Real Time Sequencer ROM Image
By Abdul H. IbrahimSee page here about mirroring the rom
MidiSlav DSK Image
Carolyn Eng
720KB midislav
SFG-01 ROM Image* 16 KB sfg-01
SFG-05 ROM Image* 32 KB sfg-05
YRM-101 FM Music Composer 16 KB yrm101
YRM-102 FM Voicing Program 16 KB
YRM-103 DX7 Voicing Program
Download the manual from
16 KB  
YRM-104 FM Music Macro** 32 KB  yrm104
YRM-105 DX-9 Editor
32 KB
YRM-301 MIDI Recorder 32 KB  yrm301
YRM-302 RX Editor
Download Manual (10MB)
32 KB  yrm302
YRM-303 MIDI Macro & Monitor
Download Manual (11MB)
48KB  yrm303
YRM-304 TX-7 Voice Editor 48KB
RARE YRM-306 DX-7-II/FD Editor
Special thanks to Chris Conkie who went through a lot of effort to get this to me.
YRM-305 – DX21 Editor 32KB  –
YRM-501 FM Music Composer II 32 KB  yrm501
YRM-502 FM Voicing Program II 16 KB  yrm502
YRM-506 FB-01 Voicing Program 32 KB  yrm506
CMW-31 Keyboard Chord Master 16grab KB  
GAR-01 Graphic Artist 32 KB  
TWE-01 Word Processor / Teleword Enhancer

Type “_TW40” to start

48 KB  
UGA-02 Graphic Card Program 16 KB  
UPA-01 Playcard Program 16 KB  
CMP-01 FM Auto Arranger
48KB  cmp-01

All ROM-images start from address &h4000 except for the SFG05 and YRM-303 ROM-images which start at &h0000

* To upgrade the SFG-01 cartridge to a SFG-05 you have to connect address line A14 from the EPROM (IC104, replace with type 27C256). Solder a wire between pin 27 of the new EPROM to pin 35 of the side slot connector. Remove the 5V connection on the circuit board between pin 27 and 28 on the EPROM. (Thanks to Erwin Meeder for the 5V Addition.)

** Henk Koekoek has sent me scanned articles from MSX Club Be/Nl Magazine which describes how to use the built-in speech synthesis on the Music Macro cartridge. Click here to read it.

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