Int 2F Fn 3901  - Kingswood Tsr Windows - Scroll Window                    [r]

   AX = 3901h
   BL = 09h
   CL = scroll direction: 01h up, FFh down, 00h clear window

Return: AX = error code (0000h if successful)
   SI,DI,DS,ES preserved

See Also: AH=39h/BL=00h,AX=3901h/BL=07h