the zoltrix has toslink i/o. maybe there is a coax daughter card..but thats getting to be a PITA if its the case.
I agree, PITA, which is why I bought a DiO 2496 back in the day. Well the PITA and to be ready for optical digital devices, one of which I am yet to start using.
If your friend is feeling ambitious:
http://www.hoxnet.com/zoltrix/ (I am assuming this adds COAX IN, since the mainboard has COAX OUT if I remember correctly)
I remember when these cards/mods were all the rage. I guess I'm getting old ;-)
-Heikki