21. Punched cards were still commonly used for data entry and programming until the mid-1980s.22. Another area includes a range of electro-mechanical punched card machines. 23. IBM introduced the 80-column rectangular hole punched card in 1928. 24. A radix sorting algorithm was originally used to sort punched cards in several passes. 25. :Subsequently there was important contributions from Herman Hollerith who invented punched card tabulation machines. 26. Punched card data was transferred to and from the core memory as binary images.27. Users could write programs in DGL and input them into DAC using punched cards . 28. That allowed punched card data to be recorded by people using only a pencil. 29. Also, the data input to early computers used punched cards . 30. The concept of keying your punched cards through the console was a marketing ploy.
