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The disc operating system VDOS was developped by the german company Vortex.

It was provided for use with the Vortex Disc Drives from Vortex (F1-D, F1-S, F1-X, M1-D, M1-S or M1-X).

VDOS was supplied on an EPROM, and was released in 3 versions:

  • VDOS 1.0
  • VDOS 2.0
  • VDOS 2.11

Further there were German and English versions of this ROMs.

The VDOS ROM also contained a machine language monitor.

VDOS supported as first DOS the Vortex format, which become a standard format later on.