Belkin F5U512-APL FireWire Notebook Adapter for PowerBook G3 Series (Discontinued by Manufacturer) Adds three IEEE 1394 ports to your Powerbook Allows for hot-swapping of FireWire peripherals 24K gold-plated connectors ensure clean transmission Inserts into 32-bit CardBus Type II slot Compatible with PowerBook G3 Series models with a Family Code of M4753 or M5343