Int 62 Fn 00D1  u - Fgdriver V4.02 - "fg_vbdefine" - Create Virtual Buffe  [V]

   AX = 00D1h
   ES:BX -> memory block for virtual buffer
   CX = buffer width in pixels
   DX = buffer height in pixels

Return: AX = virtual buffer handle
       FFFFh on error

Notes: the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145)
   the application-provided buffer must be large enough to hold CX*DX
     bytes

See Also: AX=00CCh,AX=00CDh,AX=00CEh,AX=00D2h,AX=00D4h,AX=00D5h