happs trackball and spinner hooked up at the same time

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: How do I get the happs trackball hooked up through the ps2 port so I can use it as the mouse as well. Does the usb trackball interface work. I also want to hook up a spinner to my cabinet. Is the twisty grip method better than buying a happs arkonoid spinner? Money is not an issue. I just want the best performance. How can I hook both up?? : thanks.... : I'm in final stages, just need to hook up controls (Started from scratch with plywood, it's going rather well. In fact better than I had hoped!!!

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