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===DOS/VSE===
'''DOS/VSE''' was introduced in 1979 as an "extended" version of DOS/VS to support the new [[IBM 4300|4300]] processors.<ref name=StateOfTheUnion>{{cite journal|title=The VSE Operating System State of the Union|journal=z/Journal|date=November 1, 2008|url=http://enterprisesystemsmedia.com/article/the-vse-operating-system-state-of-the-union&ts=1436818731|accessdate=September 18, 2019}}{{Dead link|date=August 2020 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
The [[IBM 4300|4300]] systems included a feature called ECPS:VSE that provided a single-level storage for both the processor and the I/O channels.<ref>{{cite book
|author = IBM
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