Netronics Phoneme generator info

Mouse mouse at Rodents-Montreal.ORG
Sun Nov 9 16:38:16 CST 2014

>> With no UART, I guess it bit-bangs the serial protocol (I am
>> surprised there's no CDP1854 on the board).  [...]

> Well, going by the doc which Francis posted, it expects a
> carriage-return character to be sent by the controlling device at
> power-up, and it automagically adjusts the baud rate.  I'm a little
> skeptical about that (because hard configuration of line parameters
> is typical with serial hardware), but I don't know enough about RS232
> comms to say how plausible/reliable it is.

If it's bit-banged, I find it plausible; taking a highly oversampled CR
character and deducing the effective divisor from it is relatively

> What the docs don't state is the other expected line parameters -
> data bits, parity, stop bits, so I'm completely in the dark there.

Back in the '80s, I played with a Votrax-branded speech synth.  Based
on rather fuzzy memory from that, you want 8N1 or 701 - IIRC the
protocol stuck to ASCII, in which case 8N and 70 are equivalent.

Unfortunately all I can recall of the protocol - even assuming it's the
same on the device I used as on the device at hand here - is that it
used short sequences (two? three? octets) to specify various phonemes,
with conversion, if any, from spelling to phonemes happening on the

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