How does a mac boot up (in detail)? I want to make a living document here to document the bootup process.

I know these parts are involved:

OldWorld ROM

OpenFirmware

Mac Toolbench (on ROM)

What i'd love to do is make/draw (over a long time) a platform MacOS will run on that isnt a Mac per-se. If a Amiga 500 could be re-done (minimig) http://en.wikipedia.org/wiki/Minimig

Then I know I can do it too.