The
expansion
card
(also expansion
board,
adapter
card
or accessory
card)
in computing is a printed circuit board that can be inserted into an
electrical connector, or expansion
slot
on a computer motherboard, backplane or riser card to add
functionality to a computer system via the expansion bus.
An
expansion
bus
is a computer bus which moves information between the internal
hardware of a computer system (including the CPU and RAM) and
peripheral devices. It is a collection of wires and protocols that
allows for the expansion of a computer.
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