FireWire 800 9-Pin To FireWire 400 4-Pin Bilingual Cable - 10Feet Black
FireWire 400 to 800 Adapter -Black — elago
Amazon.com: Firewire 400 to 800 Adapter, Yeworth FireWire IEEE 1394 Type A 400 6 Pin Female to 1394 Type B 800 9 Pin Male Data Transfer Adapter Converter : Electronics
Pearstone 6-pin FireWire-400 to 9-pin FireWire-800 Adapter
Firewire 400 to usb c : r/applehelp
Amazon.com: Firewire 400 4 Pin to 6 Pin Cable, Male to Male iLink DV Cable, 6-Pin/4-Pin IEEE 1394a, Black, 6 Pin to 4 Pin Male to Male DV Cable 4-Pin to 6-Pin