Vogons Wiki has summary from Teac Manuals.
TEAC FD-55 Series Floppy Drives
http://www.vogonswiki.com/index.php/Teac_FD-55_series
TEAC FD-55 Product Brochure (PDF, 6 pages), 1985 printing
https://minuszerodegrees.net/manuals/TEAC/TEAC%20FD-55%20Series.pdf
greg, w9gb