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You could use a Mesa 7i76E board which connects via ethernet - this is better than USB and avoids the need for a PP. http://store.mesanet.com/index.php?route=product/product&product_id=290 These are...

Not sure if you have seen this conversion with Linuxcnc and a P/port

The 125 has to be able to reverse the spindle depending on the tool used

For threading it need a slotted disc with index
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Not exactly true about linuxcnc needing a parallel port or two
You can use linuxcnc through a mesa board in any pc with a spare pci slot and as such don’t need the parallel port however cost are...

I feel I need to add that I am far from being the most experienced on here so maybe not best placed to advise you but at least I have gone though the TCL mill and made a few mistakes. I am...