I LOVE this kind of technical computer history! Anyone knows of other recommended resources?
"The 6502 CPU's overflow flag explained at the silicon level" by Ken Shirriff,
http://www.righto.com/2013/01/a-small-part-of-6502-chip-expl...
Re: books, I liked Robert X. Cringley's Accidental Empires, but it covers only until 91 (or 93 if IIRC for the 2nd edition) of the PC industry and not really technical.
edit: also, of course: https://devblogs.microsoft.com/oldnewthing/