Making a Mitsumi D359M3D MSX Compatible

Here’s a howto for making a Mitsumi D359M3D compatible with the MSX.


Setting the drive to DS0:
Cut the trace from the IC to pin 12
Solder a wire from the cutted trace (on the IC side) to pin 12 (brown wire)

On my drive I used a quick & dirty fix, to put a solderjumper on pin 10-12
This way the drive is reconized as Drive A, but can’t be used in machines with 2 drives.

Put Disk Change on pin 2:
Make a solderjumper on DEN2

Put READY on pin 34:
Cut the trace from pin 34
Solder a wire from pin 34 to the 2nd solderpad from the left of the 6 pads on a row (white wire)




Seeing multiple Mitsumi Drives having the NCL039 controller, it is almost save to assume that the RDY signal can be found on pin 35 of th NCL039. This makes it possible to make all drives using this IC MSX Compatible.

Now the drive can be used in your MSX (or in your Amiga or Korg or Yamaha)

1 reply on “Making a Mitsumi D359M3D MSX Compatible”

Thanks for the guide. I’m currently trying to do this for use on Amiga A500. Although I’ve hit a standstill:
You mention:
“Cut the trace from the IC to pin 12
Solder a wire from the cutted trace (on the IC side) to pin 12 (brown wire)”

I cannot see the brown wire, or the cut to trace from IC to pin 12 in the picture? I can only see you did a solder-jumper on pins 10&12.

Other guides for the drive mention attaching pin 2 to the original track of pin 34 but you have not done this.

Interestingly you also soldered directly onto 2nd solder pad whereas other guides mention attaching to the legs on the chip at the top.

Otherwise my set up looks exactly the same as yours but it will not work on the Amiga. I can get it to recognise inserted disk, it will spin the disk but then return to the boot screen as though the disk is not recognised… I know this is for MSX but I would have guessed it would be compatible nonetheless.

Would really appreciate your input to remove any confusion (and mistakes in my own set up!)

Here’s a link to my attempt! (BTW pin 10&12 are not connected to neighbouring pins as I have used multimeter to ensure this)

Sorry to revive an old thread! Thank you 🙂

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