Thanks, if I have to go that route, I will probably just buy a PCI card with toslink or coax out. I was hoping to get by with a solution that didn't involve more money since I have a million different cables in my cable/hardware container at home.
. . . I have an open Toslink and an open Digital coax.
As SoundChex suggested, there is and S/PDIF output on the motherboard (Toslink and digital-coax are both forms of S/PDIF). So it is simply a matter of getting the right cabling to directly connect the motherboard's S/PDIF output to the Sony's digital-coax.