This is not my field of expertise, but I believe that the Mac's built-in serial ports can't begin to cope with 19.2kbps because they get an interrupt for every byte. If so, either your statistics are wrong, or you're using a serial card. So: Am I wrong? If not, are you? If not, what card are you using? Alexis Rosen alexis at rascal.ics.utexas.edu