Hell yeah, mechanical numpad.
@Standplaats_KRK
This made me think: I bet someone could use a Raspberry Pi interface to connect a telegraph key to a computer, and use Morse Code to talk to the computer.
Now I want to see that done.
@ScottSoCal I know someone connected an RSS feed aggregator to a morse receiver a few years back... it'd just start tapping things out whenever something new showed up. Not sure it's been done the other way though.