If you're chasing BBS nostalgia on real hardware: budget far more patience for the networking layer than for the actual computer. The 1980s hardware is the easy part; convincing 2020s Wi-Fi and modern BBS ANSI dialects to cooperate is the real challenge.
Jungsi tested a WiModem232 OLED on his Atari ST and wrote about it on his blog. He used a different modem hardware than I did, but the idea is the same. The terminal program he used, "Connect", is most likely the same one I used in ST Medium resolution for my own BBS connection.
+Jungsi tested a WiModem232 OLED on his Atari ST and wrote about it on his blog. He used a different modem hardware than I did, but the idea is the same. He used "Connect" as his terminal software on the ST, but I used a different terminal program that could render ANSI graphics in ST Medium resolution, though I'd have to look up which one it was exactly.