I made a pic circuit whit a RS232 and it work fine. I have only a problem: I able to make a Visual C++ program under windows 95, using the win32 api for RS232, but i NOT able to do the same under DOS whit the Borlanc C++ 3.1 A&F. There is some one that's can help me whit C or C++ ruotine for use RS232 under DOS? Thanks in Advance, Alboni Giorgio.