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Backplane
A backplane comprises a printed circuit board that connects several connectors in parallel to each other, so that each pin[?] of each connector is linked to the same relative pin of all the other connectors.
It is used as a backbone to connect several printed circuit board cards together to make up a complete computer system.
One popular early computer system that used this approach was called the S-100 bus because the connectors used had one hundred pins.
Some computers like the Apple II and the IBM PC integrated an internal backplane for expansion cards.
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