1978: Apple DOS 3.1 - History of Desktop OSs

Slideshow: The History of the Desktop Operating System
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1978: Apple DOS 3.1 - History of Desktop OSs

Apple DOS (disk operating system) was Apple's first major operating system and deployed on the Apple II, an 8-bit computer the company sold between 1978 and 1983.

The first version was Apple DOS 3.1 and ran, as the name indicates, from a "disk"; its predecessors loaded from tape. The operating system was written by Apple co-founder Steve Wozniak and Randy Wigginton,  the latter being Apple's sixth employee. DOS was updated to versions 3.2 and 3.3, discontinued in 1983, and replaced by ProDOS, a product based on Apple III's Sophisticated Operating System (SOS) which debuted with the Apple IIe in 1983. ProDOS was later renamed to GS/OS.

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