INT 16 - HP Vectras RS/20C and RS/25C - GET MEMORY CACHING STATE                
	AX = 6F11h
Return: AH = 00h (successful)
	AL bit 0 = cache state
	    0 cache disabled
	    1 cache enabled
SeeAlso: AX=6F00h,AX=6F0Fh,AX=6F10h