Re: The PETs inspired me.
some mini or mainframe at the local university
That was me, too.
My first ever computer course (and computer use) was on an ASR33. It was located in a closet under a stair column - it was tiny, but very snug. The class had to take it in turns to use it, and you had to wait several days for any printout on fanfold paper, because the mainframe and printer was on a different site.
I can't remember now why the printout from the ASR33 itself wasn't acceptable for work submission - but it may have been part of the course, as in knowing the process as it existed at the time.