Punch-card (or "punched card") technology involves an essentially outdated computer input and output storage medium consisting of stiff, thin paper that stores data as a series of punched holes arranged in columns. The method for creating the punch-card patterns is called Hollerith coding, where the punch-card was sometimes called the "Hollerith card." From 1890 until the 1970s--at the apex of its popularity--punch-card technology was synonymous with data processing. During this time it was the most popular storage control system for the input and output of data and programs for computers or other data processing machines. Traditionally, a punch-card was a manila card about 3 inches high by 7 inches long, on which 80 columns of data could be entered in the form of holes punched with a keypunch machine or card-punch device. The punched holes corresponded to letters, numbers, and other characters that could be read by a computer connected...