Robuta

https://hackaday.io/project/16097-eforth-for-cheap-stm8s-gadgets/log/49010-a-serial-terminal-for-linux-with-working-xonxoff/discussion-69376

https://gayteam.net/video/macho-guys-tony-xoff-mc-cm-xx-fucking-hard-pt-1-2-3347

https://www.citebeur.com/en/modeles/detail/38244-tony-xoff