The FirstComputer that TimRiker ever worked on was at Penfield High School in Penfield, New York. It was likely an HP-2114A model.

The system config as best recollected:

It was running a time slicing basic environment. Perhaps the "TIME-SHARING EXECUTIVE" mentioned in the [ sales brochure]?

There are multiple emulators around for this platform. TimRiker is trying to get one running for old time's sake. Here are some useful links: