SpaceBall 4000 + USB serial + 3dxWare 10

[arpruss]

With that being said, I can't seem to get it to work. I've gotten the unsigned driver set up, and I'm running the 64-bit exe on Windows 10. It seems to start off fine, but it gets to "Error Cannot confirm P20" and ends up caught in an infinite loop where it opens the port (two beeps, as expected), initializes the serial connection, and errors out.

Try using a terminal emulator like realterm. Connect to the device. On my 4000flx, I get "Spaceball alive and well after a poweron reset" and a firmware version display. I then type "P20", press enter. If all goes well, "P20" gets echoed back. If you don't get these messages, you have a communication problem.