The IPX has two serial ports on the motherboard.These are set up via the admintool.
I have PortA set to ADM20 @ 1200 baud – The kaypro can talk to it.
I have PortB set to VT100em @ 19200 baud – This works with the IBM Terminal set for VT100 emulation.
/opt/wp/wpbin/wp runs a text version of wordperfect on the terminal.
It’s a bit anachonistic, but here’s a Kaypro accessing a BBS via the IPX:
I think it’s still better than hanging a RaspberryPi off the serial port.