Use Guide for the FC5025 Floppy Disk Controller

1. Connections, Jumpering, and Powering

2. Software Instructions

3. Reading Flipped Disks

The FC5025 floppy controller card.

The FC5025 floppy controller card.

USB port on FC5025 controller.

The 34-Pin connector on the FC5025.

An edge connector on a drive.

A jumper set on a floppy drive.

Powering the drive with a hard drive sled.

A close-up of attaching the floppy drive to the hard drive sled.


The FC5025 is a floppy disk controller card. This card operates the floppy disk drive of a system. Older systems frequently have these controllers onboard at manufacture; however for modern systems this is typically not the case, as floppy disk media has become obsolete.

The FC5025 is not the only modern floppy disk controller card oriented toward recovery of materials on legacy floppy disk media, other products in this niche include the Catweasel and Kryoflux.


There are two connections on the FC5025. The first is a Type B 4-pin USB port (see left, on the right side of the device). You can use a USB cable to connect the FC5025 to a USB port on a modern system.

The USB port most common on systems today is a Type A USB port, also 4-pin, but rectangular in shape. Therefore the USB cable for this job will likely need Type B and Type A connections. Many printers have Type B USB connections, so a printer cable may fit the description.

The other connection is a 34-pin drive port. You can use a 34-pin ribbon cable to connect to this port. The other end of this cable must be an edge connector socket that will fit onto the edge connection of the floppy disk drive. Note that you must align the ribbon cable correctly with Pin 1 of the port connection on the FC5025. On most ribbon cables there is a red stripe on one edge indicating the edge which should connect to Pin 1. On the FC5025 there is also lettering below the 34-pin connection pointing to Pin 1. Make sure the red edge lines up with this pointer.

Aligning the edge connection socket with the edge connection is less tricky, since the edge connection is keyed by having a gap. This gap is filled by a plastic section in the socket, thus one necessarily aligns the pins correctly.


Assuming the FC5025 is now connected to the USB port of a system and to a 5.25" floppy disk drive through a ribbon cable, you can check the jumper settings on the floppy disk drive. Jumpers are electrical conductors that can alter the operation logic of a circuit board by applying jumper shunts over the jumper pins. Jumper pins are closed if the shunt is applied over them, they are open if there is no shunt on them. Jumper pins are usually coupled in pairs called heads. Heads are labeled D1, IU, U0, etc., on the circuit board itself. Thus, a "D1 closed" instruction indicates one should apply the jumper shunt to the two pins by the label D1.

The FC5025 is compatible with TEAC FD-55GFR floppy drives and equivalent models (listed below), but we have seen the device work with a variety of drives, including Chinon and Canon drives. If you have a TEAC drive, follow these jumper setting instructions. If you do not, test the device with the floppy drive as is. If there are read problems, consider trying to match the jumper settings to the ones described here for TEAC drives. Just be sure to note the original jumper settings, so you can go back to square one if needed.

From the manual:

Jumper settings for TEAC FD−55GFR−7149, FD−55GFR−7193 and FD−55GFR−7220
Setting Description
D1 closed, DRIVE SELECT 1
D0,D2,D3 open
U0, U1 open DRIVE SELECT turns on front panel LED
IU open No IN USE input
DC closed, Pin 34 is DISK CHANGE output
RY open
LG open MODE SELECT polarity is normal
I open Single speed mode (360 RPM)
E2 closed Index pulses continue during seek
If using a different model of drive, make the equivalent jumper settings according to the above descriptions and your drive’s documentation.


Once the jumpers have been set you now need a power supply for the floppy disk drive if it is not already powered by a computer system. If it is not powered by the power cable from a system, an external power supply, such as a hard drive sled, can be used to power the drive. Note that you must power the computer system to which the floppy drive is attached for it to be powered.

Note: The two screws on the FC5025 are for mounting the card inside hard disk drive bay. We have not used it this way, but you can mount it inside a system if you would like. There are instructions for this installation in the manual. The card functions the same either way, whether it is installed in a computer case or simply lying on a table surface.

Using the FC5025 software >>