Bridging board

A bridging board that connects together an upstream side motherboard having an upstream side system slot and one or more upstream side daughter board mounting slots and a downstream side motherboard having at least a downstream side system slot,

• the bridging board having an upstream side connector fittable into one of said upstream side daughter board mounting slots and a downstream side connector fittable into said downstream side system slot,
• and also having a plurality of bridge wires that electrically connect a plurality of wiring pins provided in one of said upstream side daughter board mounting slots and a plurality of wiring pins provided in said downstream side system slot when said upstream side connector is fitted into said one of said upstream side daughter board mounting slots and said downstream side connector is fitted into said downstream side system slot, and IC switches that carry out connection changing of said bridge wires, which are connected to bus wires having a non-parallel wiring configuration in said upstream side and downstream side daughter board mounting slots.
• wherein both said upstream side connector and said downstream side connector are provided on a same face of a bridging board substrate and are plugged into said one of said upstream side daughter board mounting slots and said downstream side system slot, respectively, whereby said bridging board locates said upstream side motherboard and said downstream side motherboard extending in substantially uniplanar, edge-to-edge relation to each other.