Well for starters the ones that I've seen connect via the serial port (if ya have a legacy free mobo then ya'll need to get a PCI serial port card). Ya may like to checkout VLSystem's
L.I.S 2 as it comes with everthing that ya need (software is something that some don't have) and is simple enough to setup (as shown in this
review). Also if ya contact then they maybe able to point to a retailer in your area.