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by mikewarot 749 days ago
It's nowhere near all the way down to the bottom of the stack*, but it is a lot closer... try out Nand2Tetris[1], where you start with a fairly low level construct... the NAND logic gate, and work your way up to a CPU, Memory, and make a virtual PC, then write an assembler and programs for it.

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

* - Lower levels include transistor logic, analog electronics, electromagnetism, chemistry and the equilibrium equation (how transistors work), quantum mechanics (how atoms and chemistry works).