I am running Mach3 and Windows 7 64 bit and have a UC100 in my parallel port. How do I get an address to plug in to Mach3 for a USB? After 2 years I still have not seen any movement, I am at the end of my rope... If there is any one in Texas who can get my machine up and running I can bring it to you and pay you for your time. Every time I think I have the answer it doesn't seem to work...Thanks, Tony.