This 1990 FAQ from Epson says the drive worked in an Epson Equity series computer, with a "non-standard FDD interface".
https://files.support.epson.com/pdf/psb/psb.s-0060a.pdf
You might hunt for "Epson Equity" docs. The few I have read suggest that Epson sourced some parts that were nearly but not quite compatible with standard interfaces of the time, so there may be some goofball surprises waiting.