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Lathe with Step/dir spindle.

Your picture above, you have to 99 listed as probe tool. But no tool loaded in software. Shows 0 as being the loaded tool.

usually you would have the files in your config folder but the main thing is that they can be found where the file paths in the ini file point to, so don't forget to add the [PYTHON] section and contents to your ini file and set the appropriate paths.
See the sim configs for how to set things up.

sweet

and for the host interface USB?
this will not really work
LinuxCNC is a little bit different to other controller like GRBL,
you need a realtime loop between board and host and this will only work with Ethernet/Ethercat/SPI(raspberry) or LPT., not with USB or UART.

If you need almost ready to use Gateware/Drivers for your board, you can look at:

github.com/multigcs/riocore/
(github.com/multigcs/riocore/blob/dev/doc/BOARDS.md)

this is a gateware generator and all the FPGA stuff is written in verilog,
but it use W5500 UDP interface or SPI.
There is also an UART/USB plugin, but only for testing, not for realtime use.

you can take a look on my youtube channel, there are many videos with different FPGA's running RIO:
www.youtube.com/@unixconf/

but i can understand if you prefer to write your own software, it's also fun

Sorry
Power 5 W