I picked up a free Apple ADB Mouse Mk1 today. It works, but for some reason the cursor moves extremely slowly when it's plugged in. I've connected it to a Powerbook 190 and a Kanga-class G3 with the same results. Oddly, even after the mouse is unplugged, the trackpad continues to move the cursor slowly even when the mouse tracking speed is set to the highest speed. Anyone have any suggestions about what might cause this?