Int 16 Fn 27  - Hunter 16 - Control Screen Dump Area                       [b]

   AH = 27h
   AL = what to dump
       00h whole (virtual) window
       01h LCD window only

Return: AL = 00h
Desc:  control whether printscren dumps the whole 80x25 screen or only the
     part displayed in the LCD window

Note:  the Hunter 16 has a 240x64 LCD display which serves as a window into
     a 640x200 virtual screen