Did you know that in the 40's CRT tubes were sometimes used as RAM? Strange, but true! I found this fascinating when I stumbled upon it on Wikipedia:
William's Tube on Wikipedia
It would use the photon beam to "write" binary on the phosphors, and then read it back. The charge on the phosphors lasts for a fraction of a second, and you can erase one by writing the block next to it. Hope everyone finds this as cool as I did!
EP
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