SHARE Operating System
|Company / developer||SHARE user group|
|Supported platforms||IBM 704, IBM 709|
|History of IBM mainframe operating systems|
The SHARE Operating System, also known as SOS, was created in 1959 as an improvement on the General Motors GM-NAA I/O operating system, the first operating system, by the SHARE user group. The main target was to improve the sharing of programs over GM-NAA I/O.
A series of articles describing innovations in the system appears in the April, 1959, ACM Journal.
In 1962 IBM discontinued support for SOS and announced an entirely new (and incompatible) operating system IBSYS. An amusing misprint in the caption of IBM's memo to the SHARE SOS Committee: It was intended to be "Whither SOS?" but the distributed copies said "Wither SOS".
 See also
- GM-NAA I/O, the first operating system and the inspiration for the SHARE Operating System.
- Timeline of operating systems
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