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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 roman [[EPROM]], and came was released in two the versions: VDOS 1.0 and , VDOS 2.0and VDOS 2.11 The VDOS ROM also contained a machine language monitor. VDOS supported as first DOS the Vortex format, which become a standard format later on.