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| Developer | Tymshare (Norm Hardy, Bill Frantz, Charlie Landau) McDonnell Douglas Key Logic |
|---|---|
| Written in | C |
| OS family | Capability-based |
| Working state | Discontinued |
| Initial release | 1977 |
| Latest release | Final / 1988 |
| Marketing target | Research |
| Available in | English |
| Update method | Compile from source code |
| Platforms | S/370 mainframe |
| Kernel type | Microkernel |
| Default user interface | Command-line interface |
| Preceded by | GNOSIS |
| Succeeded by | Extremely Reliable Operating System (EROS), CapROS, Coyotos |
| Official website | cap-lore |
KeyKOS is a persistent, pure capability-based operating system for the IBM S/370 mainframe computers. It allows emulating the environments of VM, MVS, and Portable Operating System Interface (POSIX). It is a predecessor of the Extremely Reliable Operating System (EROS), and its successor operating systems, CapROS, and Coyotos. KeyKOS is a nanokernel-based operating system.[1]
In the mid-1970s, development of KeyKOS began at Tymshare, Inc., under the name GNOSIS. In 1984, McDonnell Douglas (MD) bought Tymshare. A year later MD spun off Key Logic, which bought GNOSIS and renamed it KeyKOS.[2]
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