KeyKOS

KeyKOS is a <a href="/facts/Persistence_(computer_science)/frF0o2q2">persistent</a>, pure <a href="/facts/Capability-based_security/negzSwhS">capability</a>-based <a href="/facts/Capability-based_operating_system/zWwprwYP">operating system</a> for the <a href="/facts/IBM/QszA7nwd">IBM</a> <a href="/facts/IBM_System/370/TRo1jaFw">S/370</a> <a href="/facts/IBM_mainframe/0kPkgADx">mainframe</a> <a href="/facts/Computer/SQe1aK05">computers</a>. It allows <a href="/facts/Emulator/FMHE8qDj">emulating</a> the environments of <a href="/facts/VM_(operating_system)/Ymu9SRtX">VM</a>, <a href="/facts/MVS/VPSmB9ML">MVS</a>, and Portable Operating System Interface (<a href="/facts/POSIX/mQkSt234">POSIX</a>). It is a predecessor of the <a href="/facts/EROS_(microkernel)/otH0PLPh">Extremely Reliable Operating System</a> (EROS), and its successor <a href="/facts/Operating_system/8XTuvMh2">operating systems</a>, CapROS, and Coyotos. KeyKOS is a <a href="/facts/Nanokernel/wsaWtYCU">nanokernel</a>-based operating system.
In the mid-1970s, development of KeyKOS began at <a href="/facts/Tymshare/r0kX2qjs">Tymshare</a>, Inc., under the name <a href="/facts/GNOSIS/2Ufnrvl6">GNOSIS</a>. In 1984, <a href="/facts/McDonnell_Douglas/cplglcRH">McDonnell Douglas</a> (MD) bought Tymshare. A year later MD spun off Key Logic, which bought GNOSIS and renamed it KeyKOS.

KeyKOS open-in-new

KeyKOS