I've got a little thingy I made myself with a Minimus AVR, to replace a parallel port to BBC Micro cable I bought about 12 years ago, when PCs still had parallel ports. USB cable connects PC to AVR, also providing power, and a bunch of wires connects AVR to BBC.

The AVR pretends to be the original unmodified PC software, translating things to and from the USB protocol that the modified PC software now uses (which was pretty straightforward to do using libusb).

The AVR is 5V, so it just connects directly.

I have a similar rig for my Oric-1/Atmos collection, wherein the processor being used to emulate a disk sub-system for the Oric is itself a ridiculously faster computer than the Oric hardware its supporting .. (Cumulus)

Nice idea to make a Wifi Modem, I've got an ESP8266 I may just wire up to an Oric one of these days, when I open that drawer full of junk and find it..

Always cool to keep the old machines going, no matter what ..

Awesome! What is it called and where did you get it?

I got this one: https://jammingsignal.com/commodore-wi-fi-modem/

But there is also this for far less: https://www.cbmstuff.com/proddetail.php?prod=WiModemOLED

There is also a great place that will 3D print enclosures for either. http://corei64.com/store/index.php

You asked! :)

Could you post some links about BBSes?

@Level29_BBS, Particles BBS, and Centronian are my favorites. You can connect using Strikelink. (discovered via @duhproject, who is an awesome follow if you're into the 8-bit scene, or want to be)

Here'e Level 29: http://bbs.fozztexx.com/