Yup exactly. I think most people didn't realize if they set X for a square screen, they could scroll all over the place. I'd forgotten that it was called a viewport.

And of course, my favourite was all the custom/customizable video modes that Hercules had silently lurking on the board. Some of the early 32-bit desktops (like the 32032) used 4-colour Hercules at 1024x1024. I don't think 16 and 8 bit PeeCees were capable of going that far, though.