EXEC 8
| Developer | Unisys |
|---|---|
| OS family | OS 2200 |
| Working state | Current |
| Source model | Closed source. Most source is available to clients under license. |
| Initial release | 1967 as Exec 8e |
| Latest release | ClearPath OS 2200 Release 16.0 / February 27, 2015 |
| Marketing target | Enterprise / Mainframes |
| Update method |
Exec and some other components: Line number based packaged changes. Most components: Interim corrections (ICs) |
| Package manager | PRIMUS (internal), COMUS and SOLAR (client and internal) |
| Platforms | UNIVAC 1100/2200 series and Unisys ClearPath Dorado systems |
| Kernel type | Monolithic kernel (uniquely hardware-assisted) |
| Default user interface | Command line |
| License | Proprietary. Term license or pay for use (metered) licenses |
| Official website | http://www.unisys.com/unisys/theme/index.jsp?id=1120000970018210161 |
Exec and some other components: Line number based packaged changes.
OS 2200 is the operating system for the Unisys ClearPath Dorado family of mainframe systems. The operating system kernel of OS 2200 is a lineal descendant of Exec 8 for the UNIVAC 1108. Documentation and other information on current and past Unisys systems can be found on the Unisys public support website.
See Unisys 2200 Series system architecture for a description of the machine architecture and its relationship to the OS 2200 operating system.
There were earlier 1100 systems going back to the 1101 in 1951, but the 1108 was the first 1100 Series computer designed for efficient support of multiprogramming and multiprocessing. Along with this new hardware came the operating system Exec 8 (Executive System for the 1108).
The UNIVAC 1108 computer was announced in 1964 and delivered in late 1965. The first 1108 computers used Exec I and Exec II, which had been developed for the UNIVAC 1107. However, UNIVAC planned to offer symmetric multiprocessor versions of the 1108 with up to 4 processors and the earlier operating systems (really basic monitor programs) weren’t designed for that, even though they supported limited multiprogramming.
When the UNIVAC 1110 was introduced in 1972, the operating system name was changed to OS 1100 to reflect its support for the wider range of systems. The name OS 1100 was retained until 1988 with the introduction of the Sperry 2200 Series as a follow on to the 1100 Series when its name was changed to OS 2200. Since that time, the 2200 Series became the Unisys ClearPath IX Series and then the Unisys ClearPath Dorado Series, but the operating system retained the OS 2200 name.
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