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.