This was the first “stand alone” disk drive system from Gemini. The drives are the same as those supplied with the G805 Henelec system, but were now used in double density format and without the built-in 1771 based disk control board.

The controller for these was the GM809 FDC card (detailed elsewhere).

Disk drives:

  • Pertec FD250
  • 40 tracks
  • Double sided
  • Single or double density
  • Maximum capacity 350K per drive

Two part numbers: GM815/1 and GM815/2 indicated the number of drives supplied.


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