John Draper asked for comments on a proposed interface to the Rander box. I would recommend using different characters to start and stop the transmission; if you use one character for both it's easy to get out of sync. ^S and ^Q are traditional, of course, and hardware flow control is another option (Perry's suggestion). Of course, not everybody's machine handles hardware flow control adequately. If you've got a dip switch annyway, you may want to use one switch to choose hardware or ^S/^Q. Bill