FYI - Most Toshiba laptops can be powered directly from the accessory power plug in the car. I made a direct cable to run the 12V to the computer (with a fuse of course!). When you start the car the laptop wil go into charge mode as the 12.5V rises to 13.8. This works with a Sat. Pro 490, a Portege 320, and a new Tectra 9100.