I was thinking the same thing, and that would be a fun project. I’ll bet someone already thought about adding RS-232 to TIPI, or doing a TIPI like design for serial, but if it were easy, it would be done by now. Maybe thats the next project.
Glad you liked my ideal. Remember that TI made stand alone RS232, may have had a PIO too.
I remember Some one made a interface card that plugged into the side of the console and you could
plug your rs232 card or ti Disk controller or 32k card, alas it could only use one card.
maybe it would help you
And again yes I would like one !