The previous mail from Gauthier is good, but the implementation found can only write a byte on serial port. Is there any other ready to use solution using a real serial transfer (baud rate, parity ....) under dos in ada using tnt dos extender from pharlap on PC (with or without call to OS) ??????? regards, Walter C�dric Engineer student - France * Sent from RemarQ http://www.remarq.com The Internet's Discussion Network * The fastest and easiest way to search and participate in Usenet - Free!