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Ben Eater's YouTube channel (https://www.youtube.com/channel/UCS0N5baNlQWJCUrhCEo8WlA) shows the step-by-step process of building an 8-bit computer, running a display and sending data over a network from fundamental components. He does use some manufactured stuff like breadboards, timing crystals and ICs, but it's still pretty cool stuff. Building computers from raw minerals would be pretty tough.

For people interested in this sort of thing, I can recommend the Nand2Tetris Courses[1] (also on Coursera).

They basically walk you through assembling and programming a full CPU from nothing but NAND-gates in a hardware description language, and in the second part even adding a compiler and higher-level language to the stack.

1. https://www.nand2tetris.org/

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