INT 10 - VIDEO - FLAT-PANEL - VERTICAL EXPANSION FOR TEXT/GRAPHICS MODES

	AX = 1E03h
	BH = function
	    bit 7: =1 set vertical expansion, =0 query expansion
	    bits 6-0: reserved (0)
	---if BH bit 7 set---
	BL = new vertical expansion setting (see #00056)
Return: AL = 1Eh if function supported
	    BH = results
		bit 7: query/set (copied from input)
		bits 6-4: reserved (0)
		bit 3: vertical expansion of text is supported by hardware
		bit 2: vertical expansion of graphics is supported by hardware
		bit 1: hardware supports independent control of expansion in
			text and graphics modes
		bit 0: set operation was successful (always clear on get)
	    BL = active vertical expansion setting (see #00056)
SeeAlso: AX=1E00h,AX=1E02h.AX=1E04h