TL;DR
Xavi Paz has created the RetroBox Modem, a Raspberry Pi-powered device that recreates the nostalgic experience of using a dial-up modem. This modem allows both vintage and modern computers to connect to actual Bulletin Board Systems (BBSs), mimicking the sounds and behaviors of traditional dial-up connections. It operates using a Raspberry Pi Zero 2 W and supports Hayes-compatible commands, translating them into TCP/Telnet connections over Wi-Fi.