Re: ONU
My first IT job was installing OS/400 on the machines that wrote the compilers for IBM... C, C++, COBOL, RPG. It was in the days of OS/400 V2R1.1.
I knew a little DOS, that was about it. CL was DevOPS before devops and you can do database magic with a few lines of RPG.
There was nothing like it in the time if you needed to develop a database application.
Linux and MySQL were years away. These machines powered every department store, car lot and town finance department.
Today I use Linux but OS/400 is an architecture that was purpose built, yes, but far before it's time.
Soltis was a genius . . . read the books.