@jay_s_uk sorry about that had a brain fart moment, I understand now I got confused because the link you provided says those drivers are supported but that's for the LPC boards I assumed it meant RRF in general has support for those and since Duet is running RRF I assumed it could drive them but I get it wasn't designed to support them via hardware well it does but I'd lose a lot of functionality. I get it now it's the same thing with those marlin boards some support the UART, or SPI but never both interfaces because the pins are not broken out, etc. Thanks for all your help Jay, I'm barely learning RRF and getting into the Duet ecosystem.
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RE: Connecting a Stepper Driver Expansion to a duet 2 wifi