Punch card data input is so 1890 US Census, right? Maybe not, if your goal is to educate kids about binary numbers and how they can encode characters. In which case, this paper clip and metal tape ...
This key-driven, manual verifier has 15 black rubber keys. Twelve are for the 12 columns on a punch card. These are labeled from 0 to 9, X, and blank. Two other keys move the card one space, and the ...
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