Int 13 Fn 25  u - Quickcache Ii V4.20 - Set Flush Interval                 [c]

   AH = 25h
   BX = interval

Return: AX = status (0000h successful)
Desc:  specify how often the cache should write dirty buffers to disk when
     buffered writes are enabled

See Also: AH=21h,AH=2Ch,AH=2Eh