Robert Rolf wrote:
> A long time ago there was a Radio Electronics article that used
> analog bucket brigade delay lines. I doubt that they are made
> anymore, but it is of historical note that before digital memory
> was cheap, the analog domain was still useful.

And back an even longer time ago, analog delay lines were used to store
digital information.  Some early computers used essentially long
transmission lines to store bits.  Some even stored bits as accoustic
signals on long rods.  This was back when a Kbyte was a lot of memory (and
before bloatware so that you could actually do meaningful things in a
Kbyte).


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