OS/390 was introduced in late 1995 and was itself was rebranded in December 2001 and extended to 64 bit processors and is currently called Z/OS.
This article (or an earlier version of it) contains material from FOLDOC's article on OS/390 (http://www.foldoc.org/foldoc/foldoc.cgi?OS%2F390), used with permission.
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