Charles Petzold’s Code: The Hidden Language of Computer Hardware and Software, 2nd Edition
(2022) is a significantly expanded update to the 1999 classic. It maintains the original's acclaimed "bottom-up" approach—starting with flashlights and Morse code to explain how computers eventually "think"—while adding modern technical depth and interactive learning tools.
Petzold encourages you to build the circuits on paper. Use free tools like or Crocodile Clips to build the adders and flip-flops virtually.
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Charles Petzold’s Code: The Hidden Language of Computer Hardware and Software, 2nd Edition
(2022) is a significantly expanded update to the 1999 classic. It maintains the original's acclaimed "bottom-up" approach—starting with flashlights and Morse code to explain how computers eventually "think"—while adding modern technical depth and interactive learning tools. Charles Petzold’s Code: The Hidden Language of Computer
Petzold encourages you to build the circuits on paper. Use free tools like or Crocodile Clips to build the adders and flip-flops virtually. Charles Petzold’s Code: The Hidden Language of Computer
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