Other options, i have one of these.. plugs into the video slot and provides component video:
https://gglabs.us/node/2014He was selling them a while back on ebay,but i dont see them now. Other option is if you have the know how he provides the pcb files and parts list to build one.
this version works off the external rgb port, a better 520 per say and offers component video:
https://gglabs.us/node/983he claims to be working on a new better version also.
