Abstract: A bus assembly for a microcomputer comprising a motherboard having a data bus of the standard type, which bus assembly comprises means for mounting a plurality of daughtercards at an acute angle with respect to the motherboard. The bus assembly further comprises a bus extension card adapted to plug into the edge card connectors of the motherboard data bus so as to be retained parallel to the motherboard. The bus extension card is provided with a plurality of edge card connectors disposed at an acute angle with respect to the card and thus at an acute angle with respect to the motherboard.