SHARE Operating System

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SHARE Operating System
Developer SHARE user group
Working state Discontinued
Initial release 1959
Available in English
Platforms IBM 704, IBM 709
History of IBM mainframe operating systems

The SHARE Operating System (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.

SHARE Operating System provided new methods to manage buffers and input/output devices, and, like GM-NAA I/O, allowed execution of programs written in assembly language.

Initially, it worked on IBM 709 computer and its transistorized compatible successor the IBM 7090.

A series of articles describing innovations in the system[1] appears in the April, 1959, Journal of the Association for Computing Machinery.

In 1962, IBM discontinued support for SOS and announced an entirely new (and incompatible) operating system IBM 7090/94 IBSYS.

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