Apple SOS 1.3 Apple SOS 1.3

Apple Sophisticated Operating System 1.3: Release Details

Apple’s Sophisticated Operating System 1.3 (SOS 1.3) made its debut in 1982, specifically designed for the Apple III Plus computer. This updated version of the original Apple SOS was publicly released on November 1st of that year and offered a menu-driven utility program and programming application programming interface (API) for accessing the resources of the Apple III.

As a single-tasking, single-user operating system, SOS 1.3’s interpreter program was loaded at boot time and used the SOS API to make requests for the system. Despite its age, the Apple SOS 1.3 still holds a special place in the company’s history and has proven to be a significant milestone in the development of Apple’s operating systems.

ReleasedNovember 1, 1982
System RequirementsApple III
Apple III Plus
DistributionFloppy disk

As we celebrate the 41 years of this operating system, it’s worth noting the impact it had on the technology industry and how it paved the way for the advancements we see in operating systems today. While it may not be as widely used as it once was, the legacy of Apple SOS 1.3 will always be remembered.

Further Reading and References

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Last updated: March 7, 2023