It looks like a standard molex or amp connector.
You would either need to get docs or open the case and see if you can find some markings indicating the plugs. Two are ground and the other two are either 5, 12 or 5 & 12 volts DC.
Here is a Amiga program that work with it. Cyberscrape.
(at the bottom)
http://www.inter-actor.com/software.htmHere is a link to the software that shipped for the LIVE! boards for KS 2
http://www.mediafire.com/?emcb7qd4d7edlMaybe some of the email links might work and some of those people know the power connection.