@little
The Mac-clones came during the early PPC-days, the only 68k-clones I'm aware of would be things like Emplant or Shapeshifter :-o
What has the abilty to run another OS has to do with the question wether Kickstart is an OS or an BIOS ??
You know, one could start linux from Workbench (thats how I did it when I tried 68k-linux for the only time).
Kickstart is the AmigaOS, just not all of it.
Exec, Intuition,GFX and DOS are in ROM, and even started before anything is loaded from disk (hint: the basic shell/cli that appears after booting an empty disk is NOT part of the boot-block).
Oh, and that book was written years after Kernie&Ritchie developed and documented C, so what every you were trying to argue here, you failed
:-D