1964 Antique MODEM Live Demo

[Brent Hilpert]

David Griffith wrote:
> 
> On Thu, 28 May 2009, Golan Klinger wrote:
> 
> > Disclaimer: I wouldn't normally post this sort of thing but I'm
> > confident it will be of interest to more than a few on this list.
> >
> > "1964 Antique MODEM Live Demo"
> > <http://www.youtube.com/watch?v=X9dpXHnJXaE>
> 
> It certainly is of interest.  I'd like to get one of those for myself.  It
> shouldn't be too terribly hard to homebrew one of these things into a
> shoeshine box, right?

I have one of the same model as shown in the video (Livermore Data Systems
model A). Component date codes in mine are 1969/70, the 1964 suggestion may be
a little early, but I guess it depends on how long they were producing them
for. Very elaborate woodwork for the task (solid teak or walnut with dovetail
joints) but I suppose the wood case had some acoustic advantages. 13 transistors.

(pedantic: His technical description was a little off, it's FSK, not an
'interrupted' tone.)

Does anyone know if the frequencies for the 110 and 300 baud modem standards
were the same or different?