Oh man, I had to use the orange ones sometimes at my first programming job. They were VAX/VMS dumb terminals. It sucked getting stuck with one of those, because the job was making a visualization GUI for some data, and these ones literally couldn't run the GUI; they were text-only. Eventually they started reserving one of the GUI-capable machines for me.
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Haha, that's giving me way too much credit. I was a high school student and was still figuring out what the GUI bits did, like the ArcBall widget, so I practically couldn't do anything useful on the GUI itself on days when I didn't have a GUI machine. I could do some of the behind-the-scenes linear algebra stuff, though. Like, there was an array that held a 3d vector at every point in space that represented the flow field, and they wanted to be able to visualize cross-sections, so for that I needed to make a 2d grid of 2d vectors on a single plane. That sort of thing basically had to be done blind anyway.