Punched Cards
The basic unit of data storage was the punched card. For the IBM 80-column card, introduced in 1928, each column represented a single digit, letter or special character. Data values consisted of a field of adjacent columns. An employee number might occupy 5 columns; hourly pay rate, 3 columns; hours actually worked in a given week, 2 columns; department number 3 columns; project charge code 6 columns and so on.
IBM Stub cards or Short cards required unit record equipment with interchangeable feeds. For 51-column stub cards such feeds were available for the IBM 077, 080, 082, 402, 403, 419, 514, 519, and 523. Other stub cards could be read only by the IBM 514 and 519.
Read more about this topic: Unit Record Equipment
Famous quotes containing the word cards:
“The world is a puzzling place today. All these banks sending us credit cards, with our names on them. Well, we didn’t order any credit cards! We don’t spend what we don’t have. So we just cut them in half and throw them out, just as soon as we open them in the mail. Imagine a bank sending credit cards to two ladies over a hundred years old! What are those folks thinking?”
—Sarah Louise Delany (b. 1889)