Well, if you want to know how computers work, the authoritative reference on computer architecture happens to have been written by a set theorist!
John von NeumannJohn von Neumann. First Draft of a Report on the EDVACFirst Draft of a Report on the EDVAC University of Pennsylvania technical report (1945) 101pp.
Ah, the good old days: when logicians understood circuit design and computer scientists believed Rice's Theorem...