DLM: The Wave Of The Past

Gizmodo has a cool article up that talks about a predecessor to Random Access Memory (RAM), Delay Line Memory (DLM). Here is a simplified analogy of how it worked,

If you had a hard time remembering things for very long, and happened to live in a cave, you could just shout out what you didn't want to forget, and a few seconds later you would hear an echo to remind you. Of course, the problem with this is that an echo doesn't stick around for long, so you would have to shout again every time that you heard the echo, so that you could remember again in a few seconds. Assuming you could keep this up, you would never forget your idea.

looks more like something that should go boom.

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