Punch card

The punch card (or "Hollerith" card) is a recording medium for holding information for use by automated data processing machines. Made of stiff cardboard, the punch card represents information by the presence or absence of holes in predefined positions on the card. In the first generation of computing, from the 1920s into the 1950s, punch cards were the primary medium for data storage and processing. Eventually the punch card would be phased out and replaced with huge floppys for media storage, for loading data, in the late 1970's, early 1980's.

External links

• Doug Jones' Punch Card history site (Collection shows examples of left, right, and no corner cuts.)
• Various punched card codes
• The Undead - Wired magazine article about modern day use of punch cards
• Scott Fishers Pennsylvania turnpike Ticket, (IBM Punch card w square holes) toll ticket webpage 1970's
• UNIVAC Punch Card Gallery (Shows examples of both left and right corner cuts.)

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