Textphones

Textphones enable deaf people to TYPE and READ

EDT is an option in the IYU V.18 spec.

I did a search for European Deaf Telephone (EDT) and came up with some interesting links.

https://www.discapnet.es/innovacion/productos-de-apoyo/terminales-de-texto-para-personas-con-discapacidad-auditiva

https://teksttelefon.no/static/informasjon-om-teksttelefonen.html

https://www.robkalmeijer.nl/techniek/telecom/telefonie/index.html

https://commons.wikimedia.org/wiki/Telecommunications_device_for_the_deaf?uselang=de

https://de.wikipedia.org/wiki/Schreibtelefon

https://oldcomputer.info/terminal/minicom/index.htm

https://www.wikiwand.com/en/articles/Telecommunications_device_for_the_deaf

https://deafwebsites.com/technology/telecommunications-devices-for-the-deaf/

RTTY - uses BAUDOT codes