>From memory I think that ttyS0 (com1) and ttyS3 (com 4) share the same interrupt. That could be your problem. Go into your bios setup and insure that these comm ports do NOT share interrupts. Usually interrupt 5 or 7 can be used for the third comm port. -- To UNSUBSCRIBE, email to debian-user-request@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org