There have been some really strange instruction sets conceived. As a student at Stanford we had a time-share system that was home-grown (as I remember). It had

There have been some really strange instruction sets conceived. As a student at Stanford we had a time-share system that was home-grown (as I remember). It had opcodes to reverse bits in a bitstring! And odder things. Somebody needed that for some research project I guess. And then repurposed the damn thing for timeshare. It was pretty sad timeshare as I recall. The only machine(s?) available to a population of what? 20,000? And about 40 terminals total. You had to sign up for 15-minute measured timeslots. I came from a state school that had over 1000 terminals on a dozen machines, all unlimited time to students. It was a big shock to find the star of Silicon Valley had such crappy student services.