i have tried to use an SGI 4D240 to drive an rs232 line at 38.4Kb (8 bits data + 1 parity) and have some evidence that it doesn't work. (our line monitor only goes at 19.2!) does anyone drive a such a line from a 4D240 or 4D2?? (i remember someone posting a query about this a while back but no response was posted.) andrew at research.att.com