Logic analyser (2):

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.