6040Z configuration (on a VM)

1. You can install Linux and LinuxCNC on a VM, but you can not run a machine with it, it must have direct hardware control to work.
2. LinuxCNC works with Parallel port, Ethernet port, Mesa boards, Pico boards, some older boards i do not recall the name, EtherCAT, etc.
It can work with USB as forum member DaBIT made it work, he has youtube with the same name so you can see it work, but it is not for any production machine, USB has huge latency issues.
Do not expect support for anything USB control, no one uses LinuxCNC with USB, not even DaBit.
3. Stop chasing ns, download the ISO from the downloads page, write it to USB, boot the PC from that USB and play with LinuxCNC, it can be used LIVE and does not touch the hard drive if you do not explicitly tell it to.
If you already have a PC with parallel port, download the 2.7 Wheezy version, again it boots from USB and use it to test the machine.
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Open the control box, see if it has separate drives, those can be easily wired to parallel port, and later if you want you can get a Mesa 7i92T, no need to change wiring at all.

If you can't find the step-time limits in the documentation, then try 5000ns as a starting point.