What may be interesting, as well, is that the earlier Datapoint 3300 terminal (announced in 1967, shipped 1959) already featured a 25 lines display, but at 72 c

What may be interesting, as well, is that the earlier Datapoint 3300 terminal (announced in 1967, shipped 1959) already featured a 25 lines display, but at 72 characters per line, just like the ASR 33 it was meant to replace. There seems to be no hard evidence on how CTC arrived at 25 lines per screen, though. Regarding the Datapoint 2260, there's prior art in form of the IBM 2260 Model 3 terminal (1964), featuring 80 characters in 12 rows as well, in direct correspondence to a punched card. (The Model 1 displayed 40 characters at 6 lines, while the Model 2 managed 40 characters at 12 lines, with only the top model of the family featuring this relation to punchcards, though. Bonus fact: the 2260s used a portrait raster tube turned on its side, resulting in vertical scan lines.)