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Pearstone 6-pin FireWire-400 to 9-pin FireWire-800 Adapter
FireWire
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What is Firewire? » Hardware » Mac » Tech Ease
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Apple Thunderbolt to FireWire Adapter - Apple
SL-FIREWIRE-800/400-SIIG-x1
Amazon.com: Clear IEEE 1394 Firewire 800 to Firewire 800 Cable, 9 Pin/9 Pin Male/Male – 3 FT : Electronics