Code by Charles Petzold, about halfway through and it slaps. I knew how logic gates worked/are, but having someone walk you through how they can be combined to build complicated electronics is incredibly interesting and valuable.

Also finished Frank Herbert's Dune and Seneca's "On the shortness of life" since last thread. Really liked Dune and will probably read Messiah soon, it's a bit silly and slightly problematic at times. Seneca I didn't appreciate nearly as much as I had hoped, his teachings are not consistent throughout the three texts in the book (not sure how these were originally produced/published, I assume at different times) and the "god I wish I was poor, life as a rich dude is so hard" is a bit hard for me to swallow. As a historic text it was very interesting though.