I Want to Connect Via Old School Computer!
There’s lots of ways of doing this these days.
The far easiest way to BBS from your old system is to use a WiFiModem. These devices hook to your RS-232 port of your old computer.
http://www.cbmstuff.com sells RS-232 and Commodore WiFi modems that work perfectly.
For Atari 8-bit computers, https://fujinet.online/ sells SIO adapters that will get you online.
For Apple II Plus/IIe systems, you can use a standard WiFiModem but you’ll need a Super Serial Card, usually in Slot#2 to connect it. Apple IIc/IIgs/IIc+ systems have a built-in Super Serial Card and you’ll need the appropriate cable to hook up the WiFiModem.
I’ve personally tested the WiFiModem sold above on: a Tandy TRS-80 Model 4P, IBM PCjr, Sinclair QL (US Version), Atari ST/Mega ST, Tandy Model 12, a C128/128DCR, and Tandy CoCo 3.
Our address is particlesbbs.dyndns.org port 6400