VG8235 MSX2+ ROMS  (jipe, QWERTY)

Available here!

Thanks to Jipe (Jean-Pierre Dubois) I now have improved circuit diagrams(VG-8230 and VG8235) and PCB (VG-8230).

Included on the Manuals and guides page.

On the back there is a so called 50 pin dual row expansion connector, which is in fact a cartridge slot.

I know of Toshiba HX-10, Sanyo MPC100, Spectravideo SVI.728,  Deawoo CPC-200, Goldstar FC200 to have such a connector, which can be made into  a second cartridge slot.

As you can see (page extracted from the SVI.728 service manual) the pin setting is identical.

From the Sanyo MPC100 manual.

Just to be sure, to know what is on what pin, measure e.g. the voltages on the connector! Pin 50 is -12V, pin 48 +12V , 45 and 47 +5V, 41 and 43 is ground. Do this also on the MSX Cartridge connector so you really know what is up or down or left or right!

Warning: Inserting a cartridge in the wrong way may kill your computer, having up and down row mixed up also. SO MEASURE!  And make it clear how to insert a cartridge, by physically inserting an obstruction to prevent that. See the example here after for such a simple but effective  construction

There after it is not too difficult to create a cable to make a second cartridge slot. You will need a 50 pin dual row connector to fit in the rear of the computer and a 50 pin MSX compatible cartridge slot connector.
If you are lucky you can reuse an old SCSI cable and get a crimp on cartridge connector.

If the cartridge connector is the PCB type, you might use an experimenters print and solder the wires.

Here is a nice example by GDX, first published on MSXVillage in french. Translation errors are mine!

What you need :

1 male 50-pin connector. It is the same connector as the old SCSI hard drives.
1 50P ribbon cable 15 to 20 cm long (SCSI type)
1 MSX SLOT connector (“Card Edge Connectors 50 pin”)
A plate with holes (“Veroboard”).
1 housing to fix the plate. (a box found in electronics stores)

Necessary tools :

1 small round file.
1 small flat file.
1 hand drill.
1 cutter and good scissors.
1 soldering iron 25 ~ 40W.
Solder.
1 wire stripper.
vice. (Not required if you are recovering a SCSI cable)

How to make:

1 / Solder the SLOT MSX connector onto the hole plate. Place it where you think it is most appropriate for the case you have.

2 / Drill the mounting holes of the plate in advance. Caution, allow the cable to pass through.

3 / Crimp the connector on the cable cable with the vice. Be careful that the cable is in the correct position. Avoid putting it off.
I did not have to do this manipulation. Because I used a piece of SCSI recovery cable. This cable has only one key in the middle instead of two as on the extension bus connector, so I had to file it so that it could fit into the connector of the bus.

4 / Separate each wire on the other end about 1 cm with a cutter and cut all even cables (2, 4, 6, ~, 50) 6 mm with scissors.

5 / Strip each wire to 1 mm, no more because the insulation shrinks when it is heated, then tin each wire and solder them one by one to the MSX connector starting with the even pins. Check each solderpoint (with a magnifying glass if necessary) for even wires before soldering the odd wires. Check each solder joint of the odd wires as well.

6 / To drill the SLOT slot of the cartridge into the housing, attach the plate into the housing, put an MSX cartridge into the SLOT and make measurements. I first used a cutter but being ineffective (it’s seen in the photo), so I used a hand drill and a small round file. With that, it’s done quickly. The small file file serves for finish. A tip, first make a slot too small for the cartridge then adjust the size with the file flat until the cartridge fits well.

7 / The slot for the cable is easily inserted with the flat file.

On the Toshiba HX-10 the expansion cartridge will be slot 3, It is so indicated on the PCB as seen in the next photo.

On some computers like the HX10 the SOUNDIN (pin 49) seems not connected. You can fix that, find the audio combine inout point of the audio amplifier on the PCB  by following the resistor/capacitor line from the cartridge connector to pin 49 on the cartridge slot. A bit complicated without circuit diagram to explain, it isusually a resistor and a capacitor in series.

Here is how GDX did it on a HX-10.

Pin 49 of the SLOT-3 is connected to a 10 KΩ resistor which is connected to the (-) side of a 10 μF capacitor. The (+) side goes to the amplifier. Now the Slot is 100% functional.

The Robotarm page, with technical manual and enhanced ROGO ROMs

The Robotarm interface DIY circuits

See also the SVI 2000 Robotarm page.

Circuit without ROGO ROM

Circuit with ROGO ROM

Original Rogo ROM

MSX 2 version of ROGO for the SVI.2000 Spectravideo robot, thanks to Jipe!

MSX 2 adapted ROGO ROM

NYYRIKKI made another version based on this modified version. Changes:
– ROM will now pass selftest correctly (if burned to EPROM without problems)
– ROGO does not autoboot, but can be started from BASIC with CALL ROGO command or by holding “R”-key down during boot.

MSX 2 no autoboot ROGO ROM

Replace a MSX turboR Diskdrive with a PC Drive.

Instruction designed and written by Erik Luppes (luppie), original here, reproduction kindly permitted by Erik.

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.

On the small PCB the following connections are made:

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)

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.

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

Replace a Panasonic FS-A1F Diskdrive with a PC Drive

Instruction designed and written by Erik Luppes (luppie), original here, reproduction kindly permitted by Erik.

This instruction shows how to connect a Samsung SFD-321B FDD to a Panasonic FS-A1F.

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 too complex and/or not 100% compatible with the original diskdrive.

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 make a small convertor on a small prototype PCB.

On the small PCB the following connections are made:

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

Replace jumper DS1 to DS0 (To make it the A drive)
Replace jumper DC to RDY (To put the RDY signal on pin 34)
Put a jumper on OPA (this adds 720kb support)

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.

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

Original japanese page:  http://www.h6.dion.ne.jp/~levin_tr/index.htm

When it reaches the point where error occurs in FDD of MSX, below-mentioned item probably will be verified first.
If it does not solve with the below-mentioned disposal, it is thought that exchange of drive itself is needed. As for exchange please go on self responsibility.

Type turn of the belt of FDD of MSX.
Inquiring stock to service center of the manufacturer, if there was a stock, the major electric store (with the lightning warehouse it was all right. ) With it makes do to obtain, it seems that. (In only cost of the belt makes do to obtain the FDD belt of Panasonic, could. (2003 May) it is grateful thing. ) Type turn zero one of the belts of Panasonic the fact that it is not enough was corrected. (2006/01/06) It does, it is increase it is.

About the FDD exchange of MSX. (34PIN or 26PIN or 24PIN)
For DOS/V FDD which presently can be procured with the new item (34PIN) there is no READY signal, connects 34PIN and does not operate normally. With saying, if it processes the cable, you can use. (Connecting that way, the type which you can use (FS-4600F? There is a unconfirmed report that) it is. )

Whole

When for DOS/V FDD (34PIN) conversion it does. (Basic, the cable just is processed. ) < Common item > Because, there is no READY signal in one for DOS/V FDD, it copes with the method of connecting” GND” to” READY”. But, with this method there is a disk and nothing dies and does not relate, unless when accessing because always drive becomes READY state, the disk has entered, it becomes error and/or drives recklessly. (Cancellation method: You insert the disk always, or attach the switch between” READY” and” GND,” when using just, you turn to ON. It seems that also higher-level method is, but here it does not touch. )  34PIN SONY MSX of system The number of pins being the same, because also position of the signal generally is the same, when” Drive Select 1” is connected,”” GND” is connected to READY”, you can use. When you can understand with diagram under, it is very grateful, is. So, as for job please go on self responsibility. With this failing, responsibility it cannot have. 2 these lines of 33 pins and 34 pins are cut off. 33 pins (GND) with 34 pins (READY) you connect. Even just this can be used, but C, it is recognized D drive. 10 pins and 12 pins are connected. Normal A, it is recognized B drive now. 26PIN MSX of or 24PIN>Panasonic type Pin assign is verified, the same signal, the signal which corresponds is connected. Because (the pin assign chart is placed in direction under, please refer. )”” GND” is connected to READY”. The power source cable is prepared, 5V is connected to red and power source is drawn up. 26PIN is the usual cable. Because 24PIN the cable is film condition, the 34PIN connector is prepared, wiring is soldered directly in the film cable when, unless you must wire immediately from the basis.

FS-A1F (26PIN)

In DriveSelect0””” DriveSelect1” and” Motor ON”” MotorEnable1” and 5V (3,5,7) which red of power source, 1 of N.C yellow of power source, other things connected the line of the same name, did not connect N.C other than power source, but it seems that is not problem. You think that the person who used FDD whose position of the connector of 34PIN and power source is not the same is good. Because (D353M3D of MITSUMI which this time is used (black), position is the same, wiring near the connector was packed and said. ) ”” GND” was connected to Ready”, but if the floppy has entered when starting, it seems that is not problem. When (there is no disk is, it stops in the blue picture. In addition, the disk having entered, it seems that remains makes ROM START when the access lamp been attached. ) As for job of the connecting changing, patience needs well enough. (3 hours it was required. But), if one time it connects and changes, because with just exchange of drive is completed from the next, as for the value which is done you think that greatly it is. Forever in order to use MSX, it is the work of being necessary.

HBD-20W (34PIN)

YD-702D-6639D (the READY signal to be) with the installation, 10 (Drive Select 1) 6639D of MSX 12 (Drive Select 1) it connects and just changes and, it can use without problem. Case of DOS/V FDD, if 33 (GND) with 34 (Disk Change) it connects in addition to that, when the Ready signal is input on MSX side, because you recognize, it is the expectation which reaches the point where you can use. Because for DOS/V and as for YD-702D-6639D, height is not enough in comparison with genuine FDD, it is not agreeable to the height of the window that way. When the hexagonal spacer for the motherboard of DOS/V is used, it becomes exactly blade height. Now the window is not processed and also the [te] becomes good.

FDD, YD-702D-6639D of the YE-DATA corporation can output the READY signal due to the setting of the jumper. Because (at 2003/06 point in time,  (it seems that is the branch office in entire country, each one please try inquiring. ) With by way of the agency which is said 6000 Yen with it was available (classified by tax). At the major electric store it seemed that cannot be obtained. ) If it is the exchange of 34PIN, position of the signal almost is the same. ” Drive Select 1” of the cable the fellow just is connected. (Connecting that way, you can use, but allotment of drive C, becomes D drive. ) I have used setting of the jumper of YD-702D-6639D, T2, DS1, IF and RY short. As for the details of YD-702D-6639D, please view PDF which is the YE-DATA corporation home page. In addition, YD-702J-6637J of 26PIN (there to be a READY signal) with slim FDD you say (half scantness of normal drive) it seems that is. However, because as for this, pin assign does not agree even 26PIN, being able to meet, perhaps the necessity to select it is not. *YD-702D-6639D not only the MSX user, is thought that it is the floppy drive which is very effective to the FM-TOWNS user.

For FM-TOWNS FDD (34PIN ready signal possession)

If the SONY affiliation can procure one for FM-TOWNS FDD of the all-inclusive dynamic item, it seems that can use with just exchange. As for panasonic system, main point connecting changing.

The pin assign of FDD.
In the below-mentioned chart * option setting (with jumper pin setting possibility. ) The odd number pin of 34PIN is GND. Those which have the parenthesis with the number of PIN the case of conversion, are something which is possible to be not yet connection. Name differs, but you must connect, the part, it connects and must change the part made the color of the cell the same.

34PIN connector. (The cable has lined up, from the left like the 1→34. )

Direct voltage source connector of FDD & pin arrangement. (From YD-702D product specification. )