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Have you seen the previous threads on converting this machine?
forum.linuxcnc.org/38-general-linuxcnc-q...dx540-rebuild#253265

If your drives use resolvers than your Mesa card choice is pretty simple, it has to be the 7i49 .
That card needs a 50-pin header FPGA card. I would suggest the 6i24 if your PC has PCIe. The 6i24 can be mounted at the end of a PCIe extension cable if that makes things easier (my own mill does this)
Or, if you prefer an Ethernet connected FPGA card, then perhaps the 7i93 would work (but check with Mesa)