i'd like to use PD to control an old-school modem. I thought it might be possible using comport, but it doesn't seem to do anything. I set the baud rate to 57600 8 N 1, opened the port using "devicename /dev/modem", and then tried "print ATZ", "print "ATDT", "print ATA", etc; but no response, not even the "OK" or "NO CARRIER" that it should get. the modem works fine through other term programs. anyone tried this?