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The expansion bay has two connectors: a six-contact connector for batteries and a 60-pin connector for data devices. This section describes only the 60-pin connector.
The connector used on the expansion modules is Foxconn part number QL00303-A601. For information about obtaining this connector, contact Apple Developer Support.
The expansion bay's data connector is designed so that when a module is inserted into the expansion bay, the first connection is the ground by way of the connector shell, then the power pins make contact, and last of all the signal pins.