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Go with classic VT100 dimensions. It's the kind of terminal that such things would be run on when it was actually a game you played on a terminal. From http://www.columbia.edu/cu/computinghistory/vt100.html I see that the display is 80x24 or 132x14 character cells, optional 132x24. I don't recall playing it at the 132 resolutions, but 80x24 is "classic"
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