system programming languages on IBM Mainframe

It has been over 25 years since I last programmed on a IBM Mainframe....

I seem to remember PL/S was a one of the languages that VM/CMS was written in...

Does system level program only happen in assembler or are there higher level languages ?

Thanks
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HalCHubAsked:
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giltjrCommented:
It depends.  Of course assembler is still used, but doing on what you are doing some system exits can now be written in C/C++.

PL/S (actually I think they are now using PL/X) was was used originally exclusive by IBM.  They did market a version of it to the consumer's, but that did not last long.  Internally IBM still uses PL/X (or whatever the current version is called) assembler and C/C++.
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