Int 10 Fn 66  - Hunter 16 - Split Display                                  [V]

   AH = 66h
   AL = control bits (see #0119)
   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

Bitfields for HUNTER 16 control bits:
Bit(s) Description (Table 0119)
 0-1   01: no split, 10: allow split
 2 allow scrolling the upper part
 3 allow scrolling the lower part