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Type an English letter, a number, or a punctuation mark. You can also flip the eight switches yourself.
ASCII uses the numbers 0 to 127. The first 32 do jobs such as starting a new line, and number 32 is a space. Most of the numbers that follow stand for visible letters, numbers, and punctuation.
Open the full ASCII table to see all 128 entries.
The switch pattern becomes a number. The shared codebook turns that number into a character.
See if you can find the letter C using only the switches.