I enjoyed this exploration of "vintage" computer systems. It differed from some other hacking tales I've read in that it was from the perspective of a person watching the hacker rather than that of the hacker. This gives it a fun detective story vibe.
The hacking itself was pretty low stakes and a lot of time was spent talking about how the hack wasn't bad enough to warrant any law enforcement getting involved. Somewhat frustrating, though probably not as much as it was for the writer at the time.