I have a RPi3 running the latest release, the one code named "stretch". So I've got a FTDI based serial to USB2 device plugged into the main console port on top. That is an FTDI Friend as its called has its RD and TXD leads attached to appropriate places on top. I use it to confirm that the WiFi adapter on the device has found the access point that this configuration is using.
Of the four USB ports I have connected to one of them a Pi Zero configured as a USB Gadget device. The other one has a USB to Serial adapter plugged into it. This is one also based on the FTDI chips and has a MAXIM RS232 to TTL translator chip on it.
This is a Parallax USB to Serial (RS-232) Adapter with Cable https://www.parallax.com/product/28031 .
I have a cable connected to the DB9 end that provides the nullmodem function, and it would be connected to a TRS-80 Model 102.
That idea comes from an article from 2015, https://arstechnica.com/information-tec ... odel-100/.
In that article he explains how to enable access to that older computer for the Raspian one, via the methods used before SystemD became the default.
So? Does the group have an idea how to enable a second console using that hardware?
I'd rather not take myself back several releases to a period well before Stretch for running this Raspberry Pi.
Interestingly enough I can connect to the Pi Zero in that mode.