Anything that Ken Shirriff writes (http://www.righto.com/) is excellent. He's a UC Berkeley EE/CS PhD who likes to restore and reverse engineer interesting hardware. His writing is so clear.
(minor disclosure - I worked in the CS department at UCB when he was a PhD
student but I didn't really know him, and I strongly doubt he remembers me.)
(minor disclosure - I worked in the CS department at UCB when he was a PhD student but I didn't really know him, and I strongly doubt he remembers me.)