> I found IOCTL_SERIAL_SET_FIFO_CONTROL in the Driver Development Kit, > which may mean it is hard to use by an application...see: > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/serial/hh/s > erial/serref_42b6.asp > > /\/\/\/*=Martin This is probably in the DDK because replacement serial device drivers are expected to implement it. It is also stated that the standard serial driver implements it. It should be possible for applications to use it, if they can figure out the args, which may be nothing more complicated than the image of the FIFO control register of the UART. Bob Ammerman RAm Systems -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics