Yes it's possible, but the connector requires a different size adapter, and the yoyo does not provide sufficient power (not enough amps) to fully charge the newer PowerBooks.
Yes, you can. The adapter is of the same size. However the current power adapter is 75w and the old yoyo is only 30w. That means it has enough power to charge a sleeping or switched off PowerBook at a pinch, or even keep it running ... just.
