SEGA SF-7000 Super Control System

I bought a SEGA SC3000 Computer (Working) and a Non-working SEGA SF-7000 Super Control System a few years ago, and just started Repairing it now. With Lots of Technical advice and help from Nick , who runs the Web site : SC3000-MULTICART , I was able to get it working. The Cable that goes from the IO-Cart was Faulty so I replaced it. Here is the Mod I did below:-

SEGA SF-7000 : I/O- Cartridge cable - Mod

The quickest & easiest way to Repair the 34-pin cable was to replace it. To do this, I de-soldered all 34-pins from the I/O-Cartdridge, and then bought a 34-pin Socket. (Commonly used for PC Floppy Dirves). I was then able to use a PC Floppy cable, which has a 34-pin IDC plug at both ends, so perfectly suited to the 34-pin port on the SF-7000. And if this Cable ever gets damaged again in future, it will be easy to obtain a replacement, and very easy to remove the old one and fit a new one. ( the only other thing I forgot to do was re-solder on the Green earth Wire, which was done after the photo was taken.)

SEGA SF-7000 : How to use a 3.5" PC Floppy Drive & Disks. By The Vortex.

I noticed that the Sega SF-7000, has a 34-pin (Empty space) on the Circuit board, that was never used. So I got a circuit diagram and checked all the pins to see how they are wired, and they follow the PC Floppy Port standard 100%, So I then went and bought a Male 34-pin PC FLOPPY port, and soldered it on. After much experimentation & reading, I eventually modified a 34-pin floppy cable to the point where the 3.5" Disk Drive was working perfectly on the Sega SF-7000. The First thing I did was Format a disk, on 20-2-2012, and it worked well. The Following is a Step by Step tutorial, to show you how to connect a 3.5" Disk Drive to your SF-7000.

Step 1 : Solder on a 34-Pin Male PC Floppy Drive Port.

 

Step 2: Solder on a 4-Pin Power cable to supply power to a PC Floppy Drive.

Then add a 4-pin Power cable, to power the PC Flopppy Drive, ( take the power from the SF-7000 power supply wires.)

SF7000 (Red wire = 12 Volts) , connect to Yellow wire on PC Floppy Power Cable.

SF7000 (Orange wire = 5 Volts) , connect to Red wire on PC Floppy Power Cable.

SF7000 (Black wire = Ground) , connect to Black wires on PC Floppy Power Cable.

Take great care to match the right Colours, and DOUBLE CHECK before soldering the wires together.

 

Step 3: Modify a 34-Pin PC 3.5" Floppy Drive Cable.

1 - Grab a 34-pin cable, label one end FD (Floppy Drive), label the other end SF7000
2 - At End labelled "SF7000" - Cut Pin 2, Pin 33 & Pin 34 ribbon wires.
3 - At End labelled "SF7000" - Solder wires 33 & 34 together
4 - At End labelled "FD" - Grab wire 34 , solder to Pin 2 ,at End labelled "SF7000"

 

Step 4: Set DS Jumper (Drive Select), on the PC 3.5" Floppy Drive.

The Drive Select Jumper can be found, by looking for the letters (DS) and the numbers 0 1 2 3.

You need to set the DS select jumper to 0.

Step 5: Attach the 34-Pin Cable to the SF-7000 and the PC Floppy Drive.

Attach a standard 3.5" PC FLOPPY Drive, and connect the 4-pin power plug.

The Original Internal 26-pin Drive cable is still attached to the 3" Drive.

So I am effectively Connecting Both the internal drive and an External 3.5" PC Floppy Drive at the same time, but you can only have one drive active at a time,

So Remove the 4-pin power cable from the Internal 3" Drive.

 

Step 6: Creating a 3.5" IPL-Boot Disk to use as a Test Disk

To test your new Floppy drive, you want to first make sure you have a perfectly working Test Disk. The best way to do this is:

Click here to Download "CPCDiskXP" and Install it on your PC.

Click here to Download the Disk Image of the IPL-Boot Disk.
(This is first time a Sega SF-7000 Disk has been imaged from a 3.5" Disk, and the image type is .DSK)

You can now create your own Perfect Test Disk.

Insert a Blank 3.5" Disk into your PC's 3.5" Floppy Drive. Run CPCDiskXP on your PC and Select the Left Icon, To Write a Disk Image onto a Disk.

It will let you Browse to the Disk image, Select the above file that you just downloaded, i.e - IPL-Boot Disk.

(CPCDiskXP Settings should not need to be changed, but just to make sure all is OK, Settings should be: DRIVE=A, TRACKS=40, SIDE=1, HEAD=1 )

In less than a minute, CPCDiskXP will have Completed writing the Disk. You now have a 3.5" SEGA IPL-Boot Disk, to Test with.

 

Step 7: Test out the New PC Floppy Drive & 3.5" Disk, on the SF7000.

Take your 3.5" SEGA IPL-Boot Disk. from your PC, and Insert it Into the 3.5" Floppy Drive, that you have attached to your SEGA SF-7000.

Trun on your SF7000 and then your SC3000 Computer, After about 5 seconds, you should hear the 3.5" Floppy Drive Loading the IPL-Boot Disk.

Congratulations, You can now move onto the Section below, and Copy all of your 3" Disks onto 3.5" Disks.

Then you can backup these Disks with CPCDiskXP onto your PC, as .DSK type disk images, (in less than a minute per disk), and then burn your collection onto a CD.

It will now be very easy to swap Disk images with people all over the world.

Another Great Disk Image Tool you may want to Download is Disk Image Manager

SEGA SF-7000 : How to COPY 3" Disks onto 3.5" Disks.

Step 1: Copy from the 3" Drive to the 3.5" PC Floppy Drive.

On the SC3000 Computer, Type UTILITY, to load the Disk Utility program into memory. Now type C, to start Disk Copy. (Make sure your IPL-Boot disk is Write Protected).

(Note: Your External 3.5" Drive's 34-pin data cable should always be attached to the SF7000 and the 3.5" Drive, but the 4-pin power plug should be pulled off.)

Insert the 3" Disk that you want to Copy and Press SPACE to start the copy, Follow the on screen Instructions, Except when it asks you to "Insert the Destination Disk",

Pull the 4-pin power cable off your Internal 3" Drive. Connect the 4-pin PC Floppy power cable (Yellow, Black, Black , Red) to your 3.5" Floppy Drive.

Now Press SPACE to Copy to the Destination Drive (3.5" Drive & Disk).

When ever it asks you to INSERT SOURCE DISK, you need to Pull the 4-pin power cable off your External 3.5" Drive, and re-connect your Internal 3" Drive's 4-pin power cable.

Repeat this process several times until copy is completed. There are about 4 READ passes and about 4 WRITE passes.

After you have copied all your 3" Disks over to 3.5" Disks. You could permanently remove your Internal 3" Disk Drive and replace it with your 3.5" Drive.

For info on other Computer systems that use a 3" Disk, CLICK HERE !!

SEGA SF-7000 : How to use a 5.25" PC Floppy Drive & Disks. By The Vortex.

I noticed that the Sega SF-7000, has a 34-pin (Empty space) on the Circuit board, that was never used. So I got a circuit diagram and checked all the pins to see how they are wired, and they follow the PC Floppy Port standard 100%, So I then went and bought a Male 34-pin PC FLOPPY port, and soldered it on. After much experimentation & reading,on 16-3-2012, I eventually found out how to get a 5.25" Disk Drive working perfectly on the Sega SF-7000. The First thing I did was Format a disk, and it worked well. The Following is a Step by Step tutorial, to show you how to connect a 5.25" Disk Drive to your SF-7000.

Step 1 : Solder on a 34-Pin Male PC Floppy Drive Port.

 

Step 2: Solder on a 4-Pin Power cable to supply power to a PC Floppy Drive.

Then add a 4-pin Power cable, to power the PC Flopppy Drive, ( take the power from the SF-7000 power supply wires.)

SF7000 (Red wire = 12 Volts) , connect to Yellow wire on PC Floppy Power Cable.

SF7000 (Orange wire = 5 Volts) , connect to Red wire on PC Floppy Power Cable.

SF7000 (Black wire = Ground) , connect to Black wires on PC Floppy Power Cable.

Take great care to match the right Colours, and DOUBLE CHECK before soldering the wires together.

 

Step 3: Obtain a Standard 34-Pin PC 5.25" - 360K - Floppy Drive & Cable.

I found a Standard 360K - 5.25" Floppy Drive, in an old 286, IBM PC Clone.

A Standard 5.25" Floppy Drive cable works as-is without any modification needed.

This type of cable has one or two 34-way EDGE Connector on one end to connect to the 5.25" Floppy Drive, and a couple of 34-way IDC plugs to connect to the Computer, or a 3.5" Drive.

You need to connect the Drive to the END of the Cable after the TWIST !!

 

Step 4: Set DS Jumper (Drive Select), on the PC 5.25" - 360K- Floppy Drive.

The Drive Select Jumper can be found, by looking for the letters (DS) and the numbers 0 1 2 3.

You need to set the DS select jumper to 0.

 

Step 5: Attach the 34-Pin Cable to the SF-7000 and to the 5.25" Floppy Drive.

Attach a standard 5.25" PC FLOPPY Drive, and connect the 4-pin power plug.

The Original Internal 26-pin Drive cable is still attached ,( and it would not matter if it was connected to the 3" Drive, as long as the 3" Drive is off, ie- no 4 pin power cable connected)

So I am effectively Connecting Both the internal drive and an External 5.25" PC Floppy Drive at the same time, but you can only have one drive active at a time, (So make sure you have Removed the 4-pin power cable from the Internal 3" Drive.)

Step 6: Creating a 5.25" IPL-Boot Disk to use as a Test Disk

To test your new Floppy drive, you want to first make sure you have a perfectly working Test Disk. The best way to do this is:

Click here to Download "CPCDiskXP" and Install it on your PC.

Click here to Download the Disk Image of the IPL-Boot Disk.
(This is first time a Sega SF-7000 Disk has been imaged from a 5.25" Disk, and the image type is .DSK)

You can now create your own Perfect Test Disk.

Insert a Blank 5.25" Disk into your PC's 5.25" Floppy Drive. Run CPCDiskXP on your PC and Select the Left Icon, To Write a Disk Image onto a Disk.

It will let you Browse to the Disk image, Select the above file that you just downloaded, i.e - IPL-Boot Disk.

(CPCDiskXP Settings should not need to be changed, but just to make sure all is OK, Settings should be: DRIVE=A, TRACKS=40, SIDE=1, HEAD=1 )

In less than a minute, CPCDiskXP will have Completed writing the Disk. You now have a 5.25" SEGA IPL-Boot Disk, to Test with.

 

Step 7: Test out the New PC Floppy Drive & Disk, on the SF7000.

Take your 5.25" SEGA IPL-Boot Disk. from your PC, and Insert it Into the 5.25" Floppy Drive, that you have attached to your SEGA SF-7000.

Trun on your SF7000 and then your SC3000 Computer, After about 5 seconds, you should hear the 5.25" Floppy Drive Loading the IPL-Boot Disk.

Congratulations, You can now move onto the Section Above, and Copy all of your 3" Disks onto 5.25" Disks.

Then you can backup these Disks with CPCDiskXP onto your PC, as .DSK type disk images, (in less than a minute per disk), and then burn your collection onto a CD.

It will now be very easy to swap Disk images with people all over the world.

 

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This Page last updated : 16-03-2012