INT 10 - HUNTER 16 - SPLIT DISPLAY

	AH = 66h
	AL = control bits (see #00187)
	BH = top row of lower section of LCD (0..7)
	BL = top row of lower section of the virtual screen (0..24)
Return: nothing
Desc:	split the LCD screen horizontally into two parts; each part may be
	  individually scrollable or fixed.
Note:	the Hunter 16 has a 240x64 LCD display which serves as a window into
	  a 640x200 virtual screen