"This is Digitalker" Video #1 in Digitalker series.

This is the quick overview as an introduction to Digitalker.
This is planned as a series of videos meant to explain in some detail
the operation of this voice synthesizer chipset from National Electronics in 1980. In my opinion it is still to this day one of the best ever made.
It is extremely simple to use.

[@gblargg]

2:20 coolest part

[@kjamison5951]

“4C Will Robinson!”

[@GothGuy885]

the digital voice reminds me of speak & spell & Speak & math

[@thecooldude9999]

Sounds a lot like a sensaphone 1104!

[@storskegg]

Three questions, 1) are the addresses assigned to phonyms (like an spo256), or commonly pronounced words (as heard in the video)? 2) were these used in ham radio repeaters? It sounds remarkably like the call sign etc annunciators on repeaters in the 90s. 3) any chance you're from around the Spring Green area? Just noticing the channel name...

[@leroyjones6958]

1) No. 2) Probably yes, they were used in elevators, cash registers, lots of places. No doubt some hams use them in repeaters. 3) Nope. The explanation of the basic
workings of Digitalker are that the 8 bit starting address of the selected word to be spoken is put on the processor data bus. Then when the NOT W/R pin goes high that
latches the data into a register and that sends the appropriate starting address out to the ROM for scanning. Each word has its own scan of multiple ROM addresses
which sound out the word. Digitalker does NOT use phonemes (or allophones as they are sometimes called), such as SPO-256-AL2 does. SPO-256 is fun to work with
too, but it is not nearly as understandable as Digitalker. On my test circuit used in these videos, there are 9 bits. The highest order bit selects SSR 1 and 2 for the basic
vocabulary, that is selected when bit 9 is low. When bit 9 is high, SSRs 5 and 6 are selected for access to the extended vocabulary.

[@notillatall]

2:20 just when it was getting good...

[@leroyjones6958]

I cut it short because this was just the intro video. There are 2 more vids that take you through all 512 possible addresses and those include the complete vocabulary and all of the noises.