FluidNC running on the cheap MKS TinyBee board with external drivers.
In this case a TB6600, but of course you may use better stepper drivers. The MKS TinyBee output is 5V, so no problem to connect any external drive unit. Ground is connected to PUL(-) and DIR(-), Pulse and Direction to PUL(+) and DIR(+). I did not connect Enable.

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