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UNIX System III

Operating System

UNIX System III, also called System 3, is a discontinued version of the Unix operating system released by the Unix Support Group at AT&T, announced in late 1981 and first released outside Bell Labs in 1982. It combined several internal AT&T Unix systems, including Version 7 Unix, PWB/UNIX 2.0, CB UNIX 3.0, UNIX/RT, and UNIX/32V, and supported the DEC PDP-11 and VAX computers, introducing features such as named pipes, the uname system call, and the run queue. Because there was no official System I, System II, or UNIX/TS 4.0 release, System III was succeeded directly by System V, and third party variants of System III included early versions of HP-UX, IRIX, PC/IX, SINIX, Venix, and Xenix. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/

Facts
Year
1980 1
Significance
Early commercial AT&T Unix release, succeeded directly by System V 1
Status
Status
Discontinued 1
FAQs

Why is there no UNIX System I, System II or System IV?

There were no System I or II versions, and no official UNIX/TS 4.0, so System V followed System III.

The system was apparently called System III because it was considered the outside release of two internally supported Bell Labs Unix systems, UNIX/TS 3.0.1 and CB UNIX 3. Its manual calls it UNIX Release 3.0, and no Unix versions called System I or System II ever existed. There was also no official release of UNIX/TS 4.0, which would have been System IV, so System III was followed directly by System V, based on UNIX/TS 5.0.
Connections

In Field

Operating Systems, Fields
Source Wikipedia: UNIX System III

Licensed Under

Proprietary Software, Concepts
Source Wikipedia: UNIX System III
In the Other Atlases

Developed By

AT&T

Also in Business Atlas: the developer of this subject.

Sources
1. Wikipedia: UNIX System III
  • Lead paragraph 3, last sentence
    System III was succeeded by System V, based on UNIX/TS 5.0.
  • Infobox: released
    1980
  • Lead section
    UNIX System III (or System 3) is a discontinued version of the Unix operating system released by AT&T's Unix Support Group (USG). AT&T announced System III in late 1981, and it was first released outside of Bell Labs in 1982.
  • Licensed Under: Proprietary Software, Infobox: source model
    Closed source
  • In Field: Operating Systems, Lead sentence
    UNIX System III (or System 3) is a discontinued version of the Unix operating system released by AT&T's Unix Support Group (USG).
View the Source
Wikidata: UNIX System III
Wikidata Q1664482, class allow-list match (w-wdresolver-0926)View the Source
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