> 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).

I had a desktop calculator once, that used an acoustic delay line to
store things like that. Interesting design. It wrote numbers on a CRT,
and the whole thing used an amazingly small number of transistors. No
"IC"s at all.



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