Tiny correction/clarification: The 3400c (and 2400) are electrically Cardbus compliant already. The only mod needed is in fact mechanical, to allow the differently-keyed Cardbus card to be inserted. The canonical fix is to modify the cardcage, but that involves a degree of surgery that many would be reluctant to perform. The simpler fix is modify the card (using, e.g., a utility knife) so that it can be inserted in an unmodified 3400c cardcage. Takes only minutes, is easy, and does not prevent the card from being used with other laptops.