I forgot to mention OC/EC (OS/ES), the Soviet era fork of OS/360 that also
borrowed from later IBM operating system releases but that evolved in its
own localized way. There was also a DOS/EC. OC/EC and DOS/EC ran on the ЕС
ЭВМ (ES EVM) mainframes, a line of machines that were instruction set
compatible with System/360 and System/370 machines. Conceivably they would
also still run on IBM machines.

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Timothy Sipples
IT Architect Executive, Industry Solutions, IBM z Systems, AP/GCG/MEA
E-Mail: [email protected]

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