Apple DOS 3.1

The Apple DOS 3.1 is a disk operating system developed by Apple in 1978, especially for Apple II computers. DOS 3.1 has been publicly released on June 1, 1978, and was the first disk-based operating system for any Apple computer. In 1979 DOS 3.1 has been replaced by DOS 3.2.

When Apple Computer introduced the Apple II on April 16, 1977, the new computer had no disk drive or disk operating system (DOS). Although Apple co-founder Steve Wozniak designed the Apple Disk II controller late that year and believed that he could have written a DOS, his co-founder Steve Jobs decided to outsource the task.

Apple considered using Digital Research’s CP/M, but Wozniak sought an operating system that was easier to use. On April 10, 1978, Apple signed a $13,000 contract with Shepardson Microsystems to write a DOS and deliver it within 35 days.

There was no Apple DOS 1 or 2. Versions 0.1 through 2.8 were serially enumerated revisions during development, which might as well have been called builds 1 through 28. Apple DOS 3.0, a renamed issue of version 2.8, was never publicly released due to bugs. Apple published no official documentation until release 3.2.

Today Apple DOS 3.1 is 44 years old!

Apple DOS 3.1
Source: – Apple DOS 3.1

Apple DOS 3.1 General Information

ReleasedJune 1, 1978
System RequirementsApple II
DistributionFloppy disk

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