Instead of starting another topic, I'll ask here and hope its ok but what is the little door on the speech synthesizer for?
The speech synthesizer was designed with a resident set of about 200 some words and phrases. The original intent was to add words to the built in vocabulary by small modules that went inside this door. One could imagine a Spanish module, or a German module, etc, especially given how many cartridges were multilingual. Then, TI figured out how to use text to speech without needing additional hardware modules and never released any of these add-in modules. I think very few were made with the connector even inside the door. If you happen to look at the box of a beige console, the updated beige speech synthesizer didn't have any door in it. (This version was never released, but it's what it would have looked like).
A couple unfortunate problems with this. You needed Terminal Emulator II to use the text to speech, and thus, it wasn't compatible with Extended BASIC. A disk based text to speech disk was released for Extended BASIC, but it wasn't compatible with the method used by TE II, so a program written in TI BASIC with TE II wouldn't work in Extended BASIC with Text to Speech unless it was modified.
Edited by Casey, Sun Jul 16, 2017 11:33 AM.