I recently purchased an atari 65xe for cheap. Seller sent pics it works but he didnt send power supply as I said I had one and he needed his for his betrer condition 130xe. Well my psu is only for the 400/800 non XL/xe models. I found I can make one online with a standard usb cable, but my question is, would i need to connect the shield material to the shield pin (pin 2) or omit this when building the cable?