Talking to a computer
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You can play with binary coding below. Simple letters and numbers are coded in just seven on or off switches inside a computer. While not all combinations of seven make a letter or number (some do special stuff, like dropping to the next line), you can experiment with the switches below to find out what switch choices do.

By changing the switches, you're acting like a program. Once you've programmed the switches, push the "run" button to see the result.

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