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I know "mainframe" is ambivalent but RPG was introduced and used with IBM's midrange line ie. I-Series aka AS/400; so not "mainframe" IMO, and the IBM proprieta

I know "mainframe" is ambivalent but RPG was introduced and used with IBM's midrange line ie. I-Series aka AS/400; so not "mainframe" IMO, and the IBM proprietary non-COBOL language on "mainframes" aka z-Series running MVS would be PL/1.

unixhero 4y ago
It says right there on the wikipedia enttry it was introduced in 1959, which was before AS/400.