Are Repetier-based printers supported by OrcaSlicer?

[Packman65]

I did not find any threads on the Repetier firmware topic.

Yes, my SeeMeCNC Rostock Max v3 delta is probably ancient by today's standards, and it's on Repetier. I'm just trying out Orca, but unlike other slicers I've used, Orca seems to accept only Klipper or Marlin machines, and I didn't seem to be able to add my Rmax v3.

So, is Repetier supported in Orca Slicer, or not?

On a side topic, I have been considering moving from Repetier to Marlin 2.x, but as far as I know that's not readily available. If anyone knows of such an avenue, please let know. Or, if there are good tutorials on how a novice in firmware can configure Marlin for a specific machine, please direct me there too.

Thanks.

Pete