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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)

Categories
Howto

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:

FSA1FX_MSX-Music

 

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.

Categories
Howto

Adding a second Drive to a FS-A1FX

A couple of days ago I posted an instruction how to connect a PC drive to a FS-A1FX.

Now that I’ve everything working I was thinking about the extra signals on the TC8566F Disk Controller. I’ve looked at the schematics in the Service Manual and decided to try out a 2nd drive.

FS-A1FX_FDD_Layout

 

On Pin 62 there is a MEN1 (Motor Enable 1) signal and on pin 68 a DS1 signal. Both are not connected.

Because they are not connected I had to solder 2 wires straight to the disc controller. (Only try this if you have a small soldering iron and a steady hand)

2nddrive

To fixate the wire in a way that it wont damage the Disk Controller, I’ve glued them with hot glue to the mainboard.

I’ve put these 2 signals on the same ribbon cable as the first drive, but connected them to pin 16 & 10 of the 2nd drive. The rest of the signals are already on the ribbon cable.

Keep in mind that the Power Supply isn’t strong enough to power 2 drives, so use an external powersupply. I’m planning to use this 2nd drive connector for a virtual floppy drive, the power is sufficient for this without an external Powersupply.

If you want to use an external diskdrive I recomend to use an old HDD Enclosure. I had an unused IDE enclosure (there are a lot on 2nd hand markets, cause a lot of people nowadays use SATA discs).

I’ve put a diskdrive in such an enclosre and only use the buildin powerconnector and on/off switch. I’ve added a LED on the 5V line, so I can see if the power is switched on.

2013-06-13 22.23.51 2013-06-13 22.24.11

 

Also I’ve made a little gap so the flatcable can come out nicely.

Categories
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.