As much as I loved the Tines as an idea, I really hate it when large portions of a scifi book take place on some "medieval" world. If I wanted that, I would just read fantasy novels.
Hence: 1981 Arpanet => True Names' cyberspace, and lookahead to issues of identity and privacy
1992: USENET => FIre's galactic communication network, with mix of well-informed commenters, flamers and out-of-touch people
1999: smart dust => Deepness' localizers (note presentation by Pister 1997) https://en.wikipedia.org/wiki/Smartdust
2006: Wikipedia revert wars => battles to enforce augment3ed reality perceptions
As for issues of sensor nets and surveillance, at 2004 Foo Camp, Pam Samuelson and I did a session where I talked about the sensor net technology and she talked about issues of surveillance, privacy, law that were already surfacing ... even years before iPhones. https://en.wikipedia.org/wiki/Foo_Camp https://en.wikipedia.org/wiki/Pamela_Samuelson
UNIX really got going on 16-bit PDP-11/20s with <64KB memory.
Software far outlasts hardware.
2) In 2007, I was Program Co-Chair for the Hot Chips conference, and got Vernor to give a keynote first day. We used keynotes for fun topics. (I had a connection via UC Berkeley Prof Kris Pister (smart dust), whose Dust Networks company I advised.) Second day, I took Vernor around the Computer History Museum in Mountain View for the morning to tour.
He said he was doing a sequel to Deepness in the Sky, about Pham & Anne's battle with the Emergents (obviously winning, given Fire Upon the Deep). Years later, I asked him what happened, as the sequel never appeared. He said it was too depressing(i.e., for those who thought Deepness dark, imagine the portrayal of the Emergents worlds.)