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10 operating systems the world left behind

AmigaOS, CP/M, OS/2, DOS -- which OS do you miss the most?

GEOS, originally a Mac-like operating system for eight-bit Commodore computers, was later ported over to the PC platform as GeoWorks Ensemble, which ran on top of DOS. Shown here stacked: GEOS 1.2 for the Commodore 64C (top); GEOS 2.0 for the Commodore 128 (middle); GeoWorks Ensemble 1.2 (bottom).

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