The Digitalker, which dates back to around 1982, always fascinated me, but it was always too expensive. I have now finally bought one of Ebay for a nice price, and downloaded the datasheet. I always thought that all information was on board this one chip, but it seems several ROMs are needed: MM52164SSR1, MM52164SSR2 and I even read recently about a MM52164SSR5 and MM52164SSR6.
I'd say these are just (EP)ROMs and can be simulated with a microcontroller or by programming a nice 64Kbit EPROM. But then I would need to have the contents (Hexdump) of those ROMs. The chips itself, which would also be fun to have, can't be found at all: Ebay just remains blank. There might be companies like Octopart that are willing to sell 1,000 items for a very "nice" price, but that is not what I'm looking for.
But what exactly are these ROMs? Just a set of parameters that form a prefab vocabulary or are they essential for the working of the Digitalker in general. As far as I know, the Digitalker (DT1050)can be used "stand alone", but the vocabulary is then limited.