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I placed the UART on DCC02 and DCC03.
- Routed TX output to RO0
- Routed RO0 to GOO
- Routed GOO to P1
- Routed RX input to RI0
- Routed RI0 to GIO
- Routed GIO to P1
Do let me know if you have questions. Glad to answer.
Got this to work, still trying to learn how the multiplexor works in the editor, but not a newbie overall.