Panasonic Diskdrive cable connector V2 (prototype)

I’m working on a new prototype to connect a PC Diskdrive on the existing  24 pin flatcable.

This will work on all Panasonic MSX2+ & Turbo-R machines.

My first version looked like this an was very bulky due to the use of a 34 pin flatcable:
2013-06-09 22.13.31

The new V2 version, only has 2 connectors and can be directly plugged into a PC Drive.

Turbo-R Drive Adapter 2Turbo-R Drive Adapter 3


This is how it looks like in a Panasonic FSA1ST

Turbo-R Drive Adapter

As this is just the prototype, it has a lot of wires, this will be replaced by a nice PCB.


Making a NEC FD1231H Diskdrive MSX Compatible

Here’s a howto for making a NEC FD1231H (Manufacturing Date 2006) Diskdrive compatible with the MSX Turbo-R (and other models)

First cut the traces of Pin 2, Pin 12 & Pin 34

Setting the drive to DS0:
Solder a wire from pin 10 of the floppy connector to pin 19 of the FDN305 controller


Put Disk Change on pin 2 (Not necessary for some Philips Models)
Solder a wire from pin6 of the controller IC to the bottem solderpad of R1

Put READY on pin 34:
Solder a wire from the TP15 to Pin 34 of the connector




Panasonic FS-A1ST add 256kb RAM

This howto describes how to add an extra 256kb Ram to a Panasonic FS-A1ST to get 512kb Ram.


  • 2x 44C256 (IC31 / IC33) (I used OKI M514256B)
  • 2x SMD Capacitor 100 nF (C138 / C140)
  • 2x SMD Resistor 100 Ω (R55 /R229)
  • 1x Resistor 10 KΩ (R41)
  • (A lot of experience soldering SMD components)


First remove the mainboard from the FS-A1ST.

When removed, clear the solderpoints of IC31, IC33 and R41.

Solder Removed

Solder the SMD Capacitors on the empty spots C138 / C140 (Topside, just above the memory IC’s)

Solder the memory IC’s on the empty spots IC31 / IC33

Solder the SMD Resistor on the empty spot R55 (Top Side, left from the memory IC’s)

Memory Resistor and Capacitors

Solder the SMD Resistor on the empty spot R229

Resistor R229

Solder the Resistor on the empty spot R41

Resistor R41

Assemble the FS-A1ST and the bootscreen will show 512Kb Ram

Bootscreen FS-A1ST 512kb