Expansion Boards
You know an expansion board as soon as you see one. It has an edge connector that fits only one place: on the motherboard made to accommodate it. But the reality of the expansion board is confused by issues of nomenclature and standards.
Nomenclature
Even the name expansion board holds a bit of confusion. Some people call them expansion cards. Is it a card or a board? In fact, the computer industry uses the two terms indiscriminately. This confused usage has a good precedent—long before computers, the electronics industry used the same terms for printed circuit assemblies. If there was any distinction, board was the generalized term (as in printed circuit board). Cards typically were smaller and usually plugged into a connector. ...
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