https://www.siliconvalley.com/2021/11/11/computing-has-gone-full-circle/

My very first computer was a Cyber 70. I didn’t own it nor did I ever get within a few feet of it. It was a giant mainframe housed at the University of Massachusetts Amherst Graduate Research Center. I accessed it via a terminal located elsewhere on campus or in my apartment. What I was doing was called time sharing because — as one of many

people accessing that mainframe — I was sharing its processing power with other users. The mainframe kept track of how much processing time I was using and — after I finished my doctoral dissertation — I got a bill for several thousand dollars for my share of that computing time, although I didn’t have to pay it because it was waived for graduate students.