KeyKOS

KeyKOS
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; 47 years ago
Latest release	Final / 1988; 36 years ago
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.com/CapTheory/KK

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]

References

^ The KeyKOS Nanokernel Architecture Archived 2011-06-21 at the Wayback Machine
^ "Roots of KeyKOS". Cap-lore.com.

External links

Official website, Norman Hardy
GNOSIS: A Prototype Operating System for the 1990s, a 1979 paper, Tymshare Inc.
KeyKOS - A Secure, High-Performance Environment for S/370, a 1988 paper, Key Logic, Inc.

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[1] The KeyKOS Nanokernel Architecture Archived 2011-06-21 at the Wayback Machine

[2] "Roots of KeyKOS". Cap-lore.com.

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v t e Object-capability security
Concepts	Principle of least privilege (PoLP) Confused deputy problem Ambient authority File descriptor C-list Object-capability model Capability-based security Capability-based addressing Zooko's triangle Petnames
Operating systems, kernels	Capsicum Fuchsia Genode GNOSIS → KeyKOS → EROS → CapROS Hydra iMAX 432 Midori NLTSS seL4 HarmonyOS (HarmonyOS NEXT) Phantom OS
Programming languages	Cajita E Joe-E Joule
File systems	Tahoe-LAFS
Specialised hardware	BiiN Cambridge CAP Flex IBM System/38 Intel iAPX 432 Plessey System 250