*showing my age*
I when I started work there was a computer. It needed to be in a temperature controlled room and needed about five staff. It took up the space of a small car, and used "tapes" about two foot in diameter. All it did was the invoices.
We did not have fax machines, but something called Teletext, that could only send words, not pictures.
I met someone years ago who started work cleaning the valves on computers. He remembered someone saying that Britain would only need two computers. One for Income Tax and one for MI5.