Famously, Dijkstra did not have a computer for most of his time there. He either typed his work on a manual typewriter (early in his career) or wrote it longhand in his elegant Dijkstra font (https://news.ycombinator.com/item?id=7796919). His secretary would print out his emails for him to read and respond to.

Eventually, he got a Macintosh (IIRC, Cynthia Matuszek (https://www.csee.umbc.edu/~cmat/) was the one who set it up for him. (Hi!))