something like a CTC on a PC

Between Pascal-VS and EPM Pascal? I don't know the former, but it was for the S-370, whereas the latter was for the AS-400. Different platforms.

EPM was the "Extended Program Model", an application program end environment in OS-400. I've been told that it was invented because OPM, the "Original ? Program Model", while well-suited to COBOL, made implementing Pascal somewhat onerous. EPM was also used for the first C implementation on the 400, though it was eventually superceded by System C and then by ILE C.

I used to know more about the differences between EPM and OPM, but many of the details have faded from memory. I do remember that EPM programs had to run in an "EPM environment", zero or more of which might be running on a 400 at any given time; there were commands like "create EPM environment" (CRTEPMENV) to manage them. OPM programs ran directly in an OS-400 subsystem.

EPM Pascal would have reminded you more of VMS Pascal. *No* AS-400 application programming environment has access to the hardware.

The stack itself wasn't written in EPM Pascal, AFAIK; I don't see how it could have been - well, parts of it, maybe, but not the low-level stuff, which would have been part of the LIC (Licensed Internal Code). It was the Sockets API - bind, accept, connect, etc - that was written in Pascal.

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