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A PC card is a standard for the peripheral interface for laptop/notebook computers. PC cards are defined and developed by the Personal Computer Memory Card International Association (PCMCIA), a group of industry organizations in the U.S. that was set up to challenge the Japan Electronic Industry Development Association standard for memory expansion cards.
No longer commonly used for memory expansion, the PC card has become the general standard for attaching laptop/notebook computer peripheral devices such as network cards, modems, hard disks and memory cards for early digital cameras. Although some portable computers still use PC cards, they have largely been replaced by the ExpressCard interface.
Formerly called PCMCIA cards, the PC card used a 68-pin, dual-row connecting interface and is about the size of a credit card. It varies in thickness from 0.13 to 0.64 inches, and was originally built around an enhanced 16-bit Industry Standard Architecture bus platform.
PC cards come in five types:
Today, nearly all the functions the PC card interface was designed for are powered by USB devices. The ExpressCard, which replaced the PC Card, has a USB interface.