FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A punched card (also punch card or punched-card) is a piece of stiff paper that holds digital data represented by the presence or absence of holes in predefined positions. Punched cards were once common in data processing applications or to directly control automated machinery.

Detailed explanation-2: -Data is stored on the card by punching holes, which represent letters or numbers, in specific column locations that relate to the information being recorded. To read this data, the card must be run through a machine that can detect or ‘sense’ the location of the holes.

Detailed explanation-3: -A punch card is a simple piece of paper stock that can hold data in the form of small punched holes, which are strategically positioned to be read by computers or machines. It is an early computer programming relic that was used before the many data storage advances relied upon today.

Detailed explanation-4: -Punched cards are a great example, because they were used for both input and output. They were also used for storage. A punched card was a piece of card with holes punched in it. The number and locations of the holes on each card was used to represent data.

Detailed explanation-5: -Since a single punch card can only store 80 bytes of information, many cards were required for data storage and programming. Sometimes they were punched by hand.