Requires Tier 7 — Electricity and Tier 8 — Communications. The hardest tier in the tree. Moving from analog electronics to digital logic is a civilizational leap that took decades the first time around. Every shortcut here depends on deep knowledge from earlier tiers.
Articles
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Semiconductors — silicon purification, doping, and diodes
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Basic Computing — mechanical and early electronic computation
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The Transistor — solid-state switching, the building block of all modern electronics
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Boolean Logic and Gates — AND, OR, NOT — from math to physical circuits
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Programming Fundamentals — instruction sets, assembly, bootstrapping a compiler
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Data Storage — magnetic, optical, and solid-state approaches to persistent memory
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Networking — protocols, wiring, and local area networks