There are older things with greater impact (Score 1)

I would have included the "C" programming language, Wordstar, and Visicalc. I am not sure that small desktop computers would have caught on in buisness without the early applications like Wordstar and Visicalc. If I have to explain the impact of the C language then there just isn't any use in debating with you.

You could also include integrated circuits. I used to work on discreet systems and LSI/VLSI changed the world. It was no fun working hardware any mosre so I became a programmer.