I like using #FreeDOS to explain how a computer starts up. DOS is simple enough and small enough that you can see the moving parts.

And once you see how it works in DOS, you can understand more complex systems like #Linux

https://www.both.org/?p=13889

Use FreeDOS to learn about computers - Both.org

Start by learning a simple system and work your way up from there.

Both.org
@freedosproject "you can see the moving parts"
I unscrew the HDD top for that