It's a binary keypad with only a 0 key, a 1 key, and an OLED display. All input is as a series of binary bytes, so as a hardcore binary typist you’ll need to know your ASCII.

https://hackaday.com/2017/04/17/this...ascii-purists/
https://hackaday.com/2017/04/17/this...ascii-purists/
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