Way back in the 79-85 era, our engineers were bring in their own computers to aid in their jobs: TI, Commodoor 64, Sinclair, Amiga, Adam, even a few early Apples.................
I upgraded a used PC with enough video cards to run 3 monitors and took it to work so I could compare two video files frame by frame and have a monitor to manage the computer.
By that time, it was really not much different from using a personally bought calculator [or back in the day, a personal slide rule] at work.
Most everybody at work had scammed the system to get larger monitors so there was no shortage of smaller monitors hanging about to set up my secondary work station.