Dijkstra spent a good chunk of the latter part of his career at the University of Texas in Austin. There was plenty of access to facilities there, but that wasn't really what his research was about. He wrote longhand (scans here: https://www.cs.utexas.edu/users/EWD/) and didn't really use much technology directly in his work.
This makes sense, because after all, Dijkstra is responsible for this famous quote: "Computer science is no more about computers than astronomy is about telescopes".
https://www.quora.com/What-did-Dijkstra-mean-when-he-said-Co...