My high school (late 70's) somehow had a Basic Timesharing Inc system (BTI 4000 IIRC) - about the size of a (US) washing machine. We had a dozen or so terminals connected to it.

It was far and away the most powerful computer in the school system - the comp sci teacher also ran the school system payroll on it, printing the checks in the computer lab every couple weeks (under a carefully trimmed cardboard box for privacy).

It had various compilers/interpreters on it. I helped get Adventure ported to it. Different era!