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I think Dr. Mozer's patent for the technology that was used in the Digitalker chip (MM54104), was licensed to NS and the vocab ROMs are copyright NS, isn't it? I had contact with mr. Mozer last year, quite an honor, still lecturing at university! And his very friendly son Todd, CEO of Sensory, but they couldn't help me with information, it was all too long ago...
The one I included in my post above, it shows an MM54104 and a Mitsubishi 256K EPROM.
I can try to repeat the URL, but it is interpreted by this message board, a picture and a short description are shown: