If you are interested in earlier conspiratorial sci-fi books featuring hardware trojans, you might try to get a copy of another sci-fi novel called "Acts of the Apostles" by John Sundman.

John Sundman wrote and published the book in 1999 after working for many years at Sun Microsystems so it is a fiction born out of the Silicon Valley geek/tech culture of that era.

Pertinent only to this thread's context, and not indicative of anything in particular, John would have been at Sun for many years at the same time as Nvidia cofounders Chris Malachowsky and Curtis Priem, late 80s through early 90s.