IBM's OS's may be considered "closed source" because they are written/supported/updated by IBM.
OS/360 Release 1 in 1965
Various versions over the years.
z/OS V1.R10 - latest release Feb 2008
Doesn't sound to me like it's going away. Big Iron will always need an OS and IBM will always oblige.
Ant those who consider Big Iron to be a 'dinosaur' should remember dinosaurs were around about 1000 times longer than homo sapiens has been around.
And looking at the way things are going today, I'm not sure we humans will be around anywhere near as long.
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