# Flip PE, bit 0 of CR0. If protection was "on", it's off, and vice verso.

# Other bits left as is.

# Squeal Mode Code. USE16/32-neutral. No immediates/literals.

# clobbers A and B. And PE (bit 0 of CR0) of course. 
#   MOV to CR0 is ring0 only. PE=0 is ring 0, because you can't flip PE 
#    elsewhere.

	zero B
	1+ B
	= CR0 to A
	XOR B to A
	= A to CR0
	
