At my university we had a couple of X terminals from IBM, connecting into DG/UX, and I can certaily vouch that for early 1990's they weren't that cheap to acquire.
If memory serves me right, we had four of them on the student lab.
Everyone else could enjoy connecting to DG/UX via terminal app on Windows for Workgroups, or the older green and ambar text based phosphor terminals.
As anecdote, those big screen X terminals were quite often used to have four parallel sessions of mixes using talk and some MUD game.
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