INT 10 - VIDEO - Compaq Extensions - ENABLE/DISABLE DISPLAY                     
	AX = BF05h
	BH = new state of video
	    00h off
	    01h on
Return: nothing
Note:	the 1993/04/08 sytem ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. appears to use BL instead of BH; a future
	  version of the list will provide more definite information
SeeAlso: AH=12h/BL=36h,AX=BF04h