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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:
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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.

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Howto

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

FDN305

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

NEC FD1231H

 

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Howto

Panasonic Turbo-R FS-A1ST 230V Mod

I’ve bought & imported almost 10 Turbo-R machines since I’m collecting/repairing and playing with MSX’s. One downside of these Japanese machines is that they are made for 100/110V.

This article describes how to modify these machines to operate on European 230 Volt power without using a step-up adapter/transformer.

First I’ve opened the Turbo-R machine:
FS-A1ST opened up

I removed the Yellow/White/Yellow cable from the transformer to measure the voltage of the transformer. The voltage without load is 15-0-15V so I’ve chosen a 230V 12-0-12V adapter to be placed in the Turbo-R (12V without a load is +/- 14V)

Then I measured the current of both winding’s with as much load as I could using a slotexpander plugged in with the following cartridges:

  • FM-Paq
  • Music Module
  • MegaFlash-SD +512kb
  • 512kb Memory Expansion.

 

While measuring the current I’m formatting a diskette to gain as much current as I can.

Current 2 when Formatting Current 1 when Formatting Formatting

The current of both winding’s is 402mA & 633mA, so my transformer of choice is a 12-0-12V 1.5A x2 transformer.

Here is how to replace the original transformer, with the new one:

First Remove the original Transformer, by desoldering the powerwires from the powerswitch.

 

 

Transformer Removed

 

Remove the white cap from the original transformer en cut the Yellow/White/Yellow wire as close to the transformer as possible.

Transformer Disassembled

Then I prepared the new transformer by soldering the Yellow/White/Yellow wires.

230V Transformer

And adding 2x 230V leads. I use shrinkwrap to isolate the solderpoints.

230V Transformer Prepared

After preparing the new transformer, place it in it’s original place and solder the 230V leads to the powerswitch.

230V Transformer in place

This is the new transformer in place.

Warning !!! 

The original power cord is isolated and tested at 100/110V
Because of ecstatic reasons, I’m taking the risk to keep on using the original power cord. I’ve never had a shock from this cord at 230V, but I’m not taking any responsibility for any harm or death.

 

My Test Setup:

Current 1 & 2 IDLE

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Howto

Making a ALPS DF354H127F MSX Compatible

Here’s a howto for making a ALPSDF354H127F compatible with the MSX.

First cut the traces of Pin 2 & Pin 34 (I use a 2mm drill on point A & B in the picture)

Setting the drive to DS0:
Change the solder jumper from DS1 to DS0

Put Disk Change on pin 2 (Not necessary for some Philips Models)
Solder a wire from pin5 of the controller IC to Pin 2 of the connector. (Red Arrow)

Put READY on pin 34:
Solder a wire from pin 32 of the controller IC to Pin 34 of the connector (Blue Wire)

ALPSDF354H127F

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Howto

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)

D359M3D

 

 

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)

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Howto

Making a Mitsumi D359M3 MSX Compatible

Diskdrives are getting more & more scare to find. Specialy drives that can be made compatible with the MSX.

Here’s a howto for making a new revision of the Mitsumi D359M3 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)

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 pin from the right of the flatcable (white wire)

 

D359M3 PCB D359M3

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

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Howto

Replace a MSX Turbo-R Diskdrive with a PC Drive.

This instruction shows how to connect a Samsung SFD-321B FDD to a :

Panasonic FS-A1FX
Panasonic FS-A1WX
Panasonic FS-A1WSX
Panasonic FS-A1ST
Panasonic FS-A1GT

On the Internet I found a couple of instructions on howto connect a PC drive to a Panasonic MSX. In my opinion these instructions are to complex and/or not 100% compatible with the original diskdrive. (DiskChange via a switch to ground, extra TTL logic for the RDY signal)

This instruction works with older revisions of the Samsung SFD-321B.
Please make sure that the Samsung SFD-321B you use has a HD sensor (the newest revision of this drive does not have this sensor, causing no support for formatting 720kb DD disks)

To minimize the damage to the mainbord I chose to desolder the 24pin ZIF socket from the defect diskdrive. I’ve put this ZIF socket on a small prototype PCB together with a 17-pin header (even pins 2 -> 34) The odd pins are all connected to ground so not used.

2013-06-09 22.13.31

On the small PCB the following connections are made:

Signal

24 pin ZIF

34 pin FDD

+5V

1

Power

Connector

RDY

6

34

GND

7

Power

Connector

Side Select

9

32

Read Data

11

30

Write Protect

12

28

Track 00

13

26

Write Gate

14

24

Write Data

16

22

Step

18

20

Direction Select

19

18

Motor On

20

16

Drive Select 0

22

10

Index

23

08

Disk Change

24

02

 

To make the Samsung SFD-321B 100% compatibel the following modifications need te be maded.

Replace jumper DS1 to DS0 (To make it the A drive)
Replace jumper DC to RDY (To put the RDY signal on pin 34)
Solder a wire between DC and OPB (to put DC on pin 2)

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Since the diskdrive has a HD Disk sensor, you need to put a piece of tape on the HD hole. To overcome this, it is possible to remove the HD sensor.

2013-06-09 22.12.42

Now you’ve got a 100% compatible diskdrive, without modifications to your mainboard.