but those never really caught on to the same scale as the classic 80-column card. To punch a number on the card, a machine made a hole in one of the bottom 10 columns. So a hole in the “1” row ...

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 ...

The Control punch card puzzle can prove to be a tricky one ... below has the solution for which punch cards go with which number terminal. If you just want a clue to try and figure it out for ...

The Pick Punch should be a Steetfighter special ... It even offers a measure of security: chop the chip, and a section of numbers, from your Visa card and you can toss away the rest free of ...