edited to add: i got it working. i was trying /dev/modem instead of /dev/ttyS0. i should have been able to symlink it, but i screwed that up some how. i have an external serial modem which is supposed to work in linux (i even saw a guy using it in SUSE). i'm running fedora core and i'm having trouble setting it up. at first, i didn't have the serial port enabled in the bios, i fixed that, but i'm still having problems. i read somewhere that i should be able to "cat /proc/interrupts" and i should see "serial" listed there. I don't see it; is there any other way to determine if my serial port is working? according to one guy who was having the same problems i'm having setserial fixed it. i ran "/bin/setserial -b /dev/ttyS0 IRQ 4". could this mess anything up? when i activated my serial port in the bios, it said it was on IRQ 4. any help/ideas are appreciated. thanks.