The busboard does not look it, but it is the
heart of the analyser. It can accept
up to five other cards, each via a discrete
connector. A sixth connector provides
a link to the computer interface. The majority
of the signals handled is common to all
the boards, as is usual in the case of busboards.
Only the five board-select-signals, the
5-volt supply and the earth connections are
individually provided for each card.
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