[comp.sys.atari.st] What are these jumpers for ?

alderaan@tubopal.UUCP (Thomas Cervera) (11/21/89)

Hi,

  I recently opened my hard drive and found some jumpers labelled J4 near
the firmware prom. Anyone out there knowing what these jumpers do ?
  The drive is a MegaFile30.

  Thanx in advance ...

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