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when I did this, programmable ones weren't invented. (1975)

My physics teacher built a computer (as in soldered together), and interested a few of us in computing.
The program scrolled Hello across the LEDS, using ROM code he'd written himself.

Had to learn a bit more about computers to do it than you do for a modern hello world, and this nut carried it to extremes, like multivibrator circuits.

Guy was a genius, though.