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Expansion card

<hardware> A circuit board which can be plugged into one of a computer's expansion slots to provide some optional extra facility such as additional RAM, disk controller, coprocessor, graphics accelerator, communication device or some special-purpose interface.

Different computers have different standards for the cards they accept, e.g. PCI.

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EXOS expanded memory expanded memory manager expanded memory page frame Expanded Memory Specification	ATX docking station expansion slot short card tall card	expansion slot expect eXperimental LISP Experimental Physics Control Systems Experimental Programming Language