Comment by pjmlp

As mentioned it evolved into NEWP, and you can get all the manuals from Unisys, as they keep selling it.

Given its architecture, it is sold for batch processing systems where security is paramount.

Yes, ESPOL and NEWP, being one of the first systems languages with UNSAFE code blocks, a binary that is compiled having unsafe is tainted and requires administrator configuration before being allowed to execute by the system.

One cannot just compile such code and execute it right away.