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I saw a version of that sign a very long time ago in a government lab at my high school summer intern job, attached to a PDP-11 that came with blinkenlights.

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First time I saw it was 1981 on the front of a DEC-10

PDP-10 Was awesome. There is a nice version of the console you can buy here => https://hackaday.io/project/170111-pidp-10

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