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 less expensive "Z" variant) was delivered with the same double-height casing as the "D" variant, so that a second drive could be retrofitted.
The === F1-S and F1-D models are based on BASF 6138 (81690-001) type disk drives, i.e. double-sided, 80 tracks per side, 96 tpi density.===
=== Variants === * '''The F1-S''' and F1- D models are based on a single 5.25" drive* '''(F1-S) or two (F1-D''' ) BASF 6138 (81690- double 001) type 5.,25" drive* '''M1-S''' - single 3disk drives, i.5" drive* '''M1e. double-D''' - double 3sided, 80 tracks per side, 96 tpi density.5" drive <br />
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Image:F1DCONT.jpg|F1-D interface board (CPC 6128)
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=== M1-S and M1-D ===
The M1-S and M1-D models are based on a single (M1-S) or two (M1-D) 3,5" disk drives.
=== A1-S Upgrade Kit ===