Chapter 30. Expansion Boards
The essence and key to success of expansion boards is standardization. By rigidly defining every dimension and contacts, expansion board standards allow you to plug almost any expansion board into almost any computer. But standardization is not a single issue. Expansion boards must be physically, electrically, and logically compatible with the motherboards with which they mate.
First of all, a board must fit into the computer for which it is designed. Consequently, today's expansion board standards dictate the physical size of expansion boards. In addition, the board must be able to send its signals to the motherboard and listen to those that the motherboard sends out. It must have some kind of electrical connection ...
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