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They still use them at a lot of checkin gates.

You can tell boarding is about to start because the dot matrix starts printing the final passenger manifest.

Thanks, now I feel really old.

Seriously though, until very recently you could hear dot matrix printers at most airline gates. They used them to print out manifests to hand to the crew right before the plane departs.

Loud is a typist typing away ferociously on an IBM Model M.

You should have heard my teleprinter. Hooked up to my Nascom-2 with the UART driving a transistor that in turn drove a reed relay for the 170 V (I think) signal. It was only five bit code so I had to write a driver for it.