Speaking of books that seem dated now, I'm rereading "Lady of Hay" which was written in the 80-s. It's not a SF novel, but it's pretty weird to be reminded what life was like back then (I'm old enough to remember, but still...). Poor characters in the book must go to a library to look up historical persons and events, instead of just googling them; when they forgot to go shopping, they must eat whatever leftovers they have in the fridge, instead of ordering in (in London, not in some remote farm house); and so on. I felt really sorry for them.
The toil and trouble of life without internet...