There are 2 remaining terminal emulator programs(*) for RISC OS, Hearsay and Connector. I had Connector working with the Pi2's internal serial port. This evening I sat down and poked at Hearsay until it worked also. :-)
It took a little convincing. Hearsay is not really set up to easily switch from one serial port to another.
(*)as in for talking to a serial port, not net connections or whatever
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko