| Edge-notched Card |
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| history of computing | |
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Edge-notched cards were manipulated by putting one or more long wire pins through certain holes. As the pins were lifted, the cards that were notched in the hole positions where the pins were inserted would be left behind as rest of the deck was lifted by the pins. Using two or more pins produced a Logical And function. Combining the cards from two different selections produced a Logical Or . Quite complex manipulations, including Sorting were possible using these techniques. Before the widspread use of computers, some Public Libraries used a system of small edge-notched cards in paper pockets in the back of library books to keep track of them. SEE ALSO REFERENCES |
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