Analogue/vector character generator - anyone remember the URL?

[Glen Slick]

On 2/27/07, listmailgoeshere at gmail.com <listmailgoeshere at gmail.com> wrote:
> Hi cctalkers,
>
> A while back there was a URL posted somewhere on this list about a
> (1950s?) character generator which worked solely by mixing harmonics,
> with X-Y output to connect to a display tube. It could only generate
> the digits 0-9, but was a seriously impressive piece of kit
> nonetheless.
>

Found this, but this is probably something different that what you
were looking for.

"X-Y alphanumeric character generator for oscilloscopes"
http://www.freepatentsonline.com/3866210.pdf

BTW, this this the scheme that the scope interface of the SYM-1 uses?