INT 16 - Compaq Systempro and higher - DISABLE CACHE CONTROLLER

	AX = F402h
Return: AX = E202h
Notes:	also supported by some versions of AMI BIOS dated June 1992 or later
	many (most) BIOSes return a modified AH when called for an unsupported
	  or non-keyboard function (typically, the highest supported keyboard
	  function [normally 12h] is subtracted from the original AH)
SeeAlso: AX=F400h,AX=F401h