To use the UC100 parallel port to USB driver you will need to make the following settings changes:
Open Config – Ports & Pins – Motor Outputs
Make changes as per this screen (disable the B Axis):
Download and run the driver from http://cncdrive.com/MC/UC100%20full%20auto%20installer/UCx00setup.exe
When asked, make sure ‘Mach3’ is selected.