I think DigiTalker was more intelligible than VOTRAX,
another voice
synthesizer chip, but had a limited vocabulary. If it was not in the
ROM it could not be said, so your "special" ROM makes sense. VOTRAX
was a phoneme generator. I have two of these. One is for a TRS-80
Model 3 and the other is a "generic" parallel interface type.
VOTRAX, that brings back memories. I once used one of those; it was a
serial-port model, with phonemes chosen by characters sent down a
serial line from the host...it was a kinda fun toy.
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