Here's a short video on how to get that GoTek USB floppy emulator working on your Yamaha SY99, explained in roughly 5 minutes. If you don't have the time, here's what you need:

1) A GoTek USB floppy emulator, e.g. [ Ссылка ]
2) A USB serial adapter, e.g. [ Ссылка ]
3) or a USB-A to USB-A cable in case you found an Artery chip inside your floppy drive emulator: [ Ссылка ]
4) some wires, maybe [ Ссылка ]
5) a 34pin to 26 pin adapter cable, if you replacing an original drive: [ Ссылка ]
5) Flasher software for ARM chips: [ Ссылка ]
6) or for Artery chips: [ Ссылка ] ("In-Circuit-Programming tool supporting AT32 MCU")
7) Flashfloppy: [ Ссылка ]

Video script (for the full script, join my Patreon):
So you bought one of those $20 USB floppy emulators to install in a SY99. Those won't work out of the box. What you need to do is to open them up by removing the 3 screws on top of them.
Now, take a look at the inscription on the tiny processor found on the main board. There are two chips you can find here: ARM STM32F105 or Artery AT32F415.

Depending on what you find, you may need a USB flash adapter for the STM or a special USB cable with type A ends on both sides for the AT32.

In my case, I found an STM32F105 chip inside. As I had no suitable USB cable, I used this USB serial port adapter on a breadboard. I also needed some connector cables that plug into the breadboard.


Take a look at your USB floppy drive. There should be a set of pins near the power plug, a row of 5 pins and another row of four pins.
On most boards, there are holes instead of pins. In that case, you can either solder the pins on yourself or just plug the wires into the holes and attach them with needles or anything that will secure them in place.

If you have pins, you can now place a jumper on the outermost of the 5 pins. This will put the drive into flash mode. If you don't have the pins, you can use a short wire.

Then take a look at the schematics of the serial adapter. We're going to use 4 pins: TX, RX, VCC and GND, which are abbreviations for transfer, receive, voltage and ground.

The TX of the serial adapter must be connected to the RX pin of the usb floppy drive, and the TX of the floppy must be connected to the RX of the serial adapter.
Then, connect the voltage pin and ground pin of the adapter to the power plug of the usb floppy drive.

Now, connect the serial adapter to a USB port on your computer. Download the flash image installer by st electronics and install it. Then, download a software called flashfloppy. Unzip the archive.

Launch the flash image installer and select your COM device. I found using a lower baud rate to be more successful. Click next.

If your device isn't found at first, don't worry. Perform a reset by briefly short circuiting the two innermost pins on the usb floppy drive, then try again. Eventually, your floppy drive will be found and connected.

If necessary, click the remove protection button.
On the next screen, just press next.

Then select download to device and select the hex file inside the flash floppy folder you unzipped previously. Change the filetype filter if needed. Select the hex file that is named after the chip on your floppy drive board, in this case STM32F105.

Then press next and wait for the download process to finish.

Next, set jumpers to make the drive work. The order is two empty colums of pins, jumper, one empty column, jumper.
...

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