I have no knowledge or experience related to GoTek floppy emulators, but if it's a question related to which wires to connect where, I found a copy of the Roland G-800 Service Notes:
View and Download Roland G-800 service notes online. intelligent synthesizer 64 voice polyphony. G-800 synthesizer pdf manual download.
www.manualslib.com
Edit: You could also try contacting GoTek about the specific model of floppy emulator that you've got, to see if they can give you any help related to installing it:
GoTek Floppy Drive to USB Conversion Manufacturer Factory, get here all types of solution regarding Floppy to USB, Floppy to USB Converter, Floppy Drive, USB Floppy Emulator, Floppy to USB Emulator, Floppy Disk Drive, Floppy Drive to USB, Floppy to USB Conversion, Floppy Disk Reader, External...
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