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Need some legacy ports? OWC's 13-port Thunderbolt 3 dock is shipping and even includes Firewire - 9to5Mac
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Review: OWC Thunderbolt 3 dock is the only game in town for FireWire 800 | AppleInsider
3 Port FireWire 800 Repeater Hub Reviews & Customer Ratings
N8PFW8HR - Verge Labs - FireWire800 Hub, Repeater, 8 Port
FireWire 800 Powered Hub for Digital Back ( 3 Port ) – Capture Integration