A portable computer has a base unit with a first expansion connector mounted on a rear wall. The expansion connector is covered by a connector unit. The connector unit includes pivotally mounted upper and lower covers having laterally extending guide portions. The upper and lower covers have a closed position which covers the connector. An external expansion unit has a second expansion connector mounted on a connector mounting surface. A cover opening member projects from the connector mounting surface. When the expansion unit is connected to the portable computer the cover opening member pushes the upper and lower to covers to an open position which uncovers the first expansion connector.
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