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2. Digital card - Wikipedia

   en.wikipedia.org/wiki/Digital_card

   Front side of the first magnetic stripe plastic credit card. Note that the narrow magnetic stripe is on the front of the card. It was later switched to the back side. Back side of the first magnetic stripe plastic credit card Back of early magnetic striped encoded paper card. The narrow magnetic stripe in the center of the card was applied ...

3. Punched card - Wikipedia

   en.wikipedia.org/wiki/Punched_card

   Punched card. A 12-row/80-column IBM punched card from the mid-twentieth century. A punched card (also punch card[ 1] or punched-card[ 2]) is a piece of card stock that stores digital data using punched holes. Punched cards were once common in data processing and the control of automated machines . Punched cards were widely used in the 20th ...

4. Common Access Card - Wikipedia

   en.wikipedia.org/wiki/Common_Access_Card

   Common Access Card. A Common Access Card (CAC). The common access card, also commonly referred to as the CAC, is the standard identification for active duty United States defense personnel. The card itself is a smart card about the size of a credit card. [1] Defense personnel that use the CAC include the Selected Reserve and National Guard ...

5. Do magnets affect credit cards? - AOL

   www.aol.com/finance/magnets-affect-credit-cards...

   Prolonged exposure to magnets can affect the functionality of your credit card. Cards with magnetic strips can also become demagnetized due to dirt, scratches and other damage. EMV chip technology ...

6. Magnetic storage - Wikipedia

   en.wikipedia.org/wiki/Magnetic_storage

   Magnetic storage. Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetizable material to store data and is a form of non-volatile memory. The information is accessed using one or more read/write heads .

7. Vacuum-tube computer - Wikipedia

   en.wikipedia.org/wiki/Vacuum-tube_computer

   A vacuum-tube computer, now termed a first-generation computer, is a computer that uses vacuum tubes for logic circuitry. While the history of mechanical aids to computation goes back centuries, if not millennia, the history of vacuum tube computers is confined to the middle of the 20th century. Lee De Forest invented the triode in 1906.