If you read "but 40 years of x86 evolution have left a labyrinth of forgotten backdoors into the ultra-privileged modes" then I'm more inclined to agree, though

If you read "but 40 years of x86 evolution have left a labyrinth of forgotten backdoors into the ultra-privileged modes" then I'm more inclined to agree, though also wondering about V86 monitor after looking at http://www.scs.stanford.edu/05au-cs240c/lab/i386/s15_03.htm http://www.scs.stanford.edu/05au-cs240c/lab/i386/s15_03.htm