The IBM mainframe I had access to in the 80s at University of Illinois of Chicago had quotas of compute time (that reset on a weekly basis). Since I worked in t

The IBM mainframe I had access to in the 80s at University of Illinois of Chicago had quotas of compute time (that reset on a weekly basis). Since I worked in the computer center, I had an account that had a larger quota (or possibly unlimited, I don’t remember now, perhaps the unlimited was when I advanced to a staff level?). One of the more entertaining things was when one class started having people code in Ada. Unfortunately, the Ada compiler was a CPU hog and a single compilation was enough to use up a week’s quota. As a result, students had to work in teams and share access to their online disks (VM/CMS did allow different modes that allowed privacy for things like email to be kept even while allowing read access to the rest of the stuff on the disk—also noteworthy was the lack of subdirectories). The team members had to switch to a different account after each day‘s work since they would exhaust each account’s quota. If you inadvertently logged out too soon, it was possible that a homework assignment could not be completed.