Changes

These are the first generation of 720K floppy disc drives from Vortex. They came in variants having either a single drive ("S" variant) or two drives ("D" variant). The "S" variant (as well as the "Z" variant) were supplied was delivered with the same double-height casing as the "D" variant, so that a housing in which two drives can second drive could be installedretrofitted. The 5,25" drives used were BASF 6138 type drives (double-sided, double density, 80 tracks per side, 96 tpi).