did you do the doublecheck with the port adress?

Windows 10 64bit with a USB port card is not a good idea
(will IMHO not work).
if your choice is win10 64bit a UC100 will be the right way to use.

forgot something, you also have to check in bios that the lpt port is set to bidirection or epp mode.

I did not check the BIOS.
I has a UC100 4 years ago from PC4U or something like that and it did not work I heard there is one out now that is real good.  Might check that out if the XP doesnot work out. 
Thanks,

Ray

I use UC100s on my lathe and mill and they are excellent.  Apparently they are widely faked in the Far East, make sure you have one from the real supplier, CNCDrive, who are based in Hungary.  However for configuration it's nearly identical to the standard parallel port but at least you won't have to worry about BIOS and all that stuff, you just connect to a standard USB port, make sure you have the UC100 plugin installed, and you're off to the races.  You can also ditch your XP machine and use a modern Win10 laptop or miniPC - it may also work with Win11.  Good support forum too at https://www.forum.cncdrive.com/

John, I don't know if this matters but I have Nema 34 steppers and each one has it's own driver and each one has it's own 60VDC power supply.
If I get another UC100, I will get it from  CNCDRIVE.com.

Why would it matter?

John, I will use Win10 64bit with the 5 axis USB board below and a 12/24 VDC power supply to the board as well as 5 VDC from the PC.  Hope this works.  If not I will buy another UC100 from cnc drive.

Sorry John, wrong board.  This is it.

Ethernet interface motion control board?  Or is it USB?  Can't tell from the connector.

It is USB.  I am having trouble finding connectors to plug into the five white 4 pin connections.  No one around here has them.

Ray