Ingesting professional sony beta and sx tape into iMac thru Canopus ADVC 110
If you have firwire device but no firewire port you need an adapter. Apple offers one:
http://store.apple.com/us/product/MD464ZM/A/apple-thunderbolt-to-firewire-adapter

If you tape deck is offering an output that the Canopus supports you will be able to capture your tapes that way.
Alternatively you might want to look for a USB based solution that might be cheaper than using this device with an adapter.