Comment by accrual

> I often like to watch them work on their 16-colors IBM z/OS host terminals, it's quite mesmerizing

They really are. I had a parttime coworker who moonlighted some mainframe job and he often had another laptop on his desk connected to a z/OS terminal. He would show me some of the jobs and code occasionally too, really fascinating stuff, and he was quite good at it and could navigate quickly.