Some of us worked in VAX/VMS, MVS, and JCL ... but that was on big(ger) iron.
Those guys were like ‘gods’ to the ‘rest of us’....................
My favorite was Lotus 1.2.3. on VAX/VMS. I themed the range names so that reading a block of them told a story. It was a massive program that I later had to write again from scratch with Virtual Basic for Applications.
I worked on those, among others. Back in the day, I did a lot of MVS and JCL work. I wrote specialized JES (basically job-entry-system) exits in assembler language to control how the mainframe interpreted JCL cards (job-control-language). I customized JES exits with back doors to scan for my jobs, and give them highest priority to run on the mainframe (hee-hee). Co-workers were mystified how I got immediate turnaround on running my jobs. I checked many years later, and my code was still running.