Uploaded June 2024 | Updated September 2026, 2 weeks ago

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Proof of concept
Once I've sorted out a few issues I'll upload how this all works.
Hardware
Votrax TYPE 'N TALK Serial Text to Speech Synthesizer
Liberty Electronics: Freedom 100 Terminal
Raspberry Pi 4 Model B
Two TTL to RS232 adaptors

Teardown and circuit diagram by Kevin Horton.
kevtris.org/Projects/votraxtnt/index.html

Votrax History - Wikipedia
en.wikipedia.org/wiki/Votrax