Abstract: Described is a substrate connector assembly which includes a first circuit substrate, a second circuit substrate and a connector mounted on the first circuit substrate for connecting wiring patterns formed on the first circuit substrate with wiring patterns formed on the second circuit substrate. The first circuit substrate includes first wiring patterns capable of being connected to external wirings and second wiring patterns in a second wiring area apart from the first wiring patterns by a predetermined creepage distance to provide a sufficient isolation. The connector includes a contact array of a plurality of contacts, and a key which is formed at a position for separating the plurality of contacts of the contact array into a first contact group and a second contact group for (1) preventing a misconnection of the second circuit substrate and (2) separating the first wiring patterns from the second wiring patterns by the predetermined creepage distance.

Abstract: It is to provide a sub-card board connector capable of secure grounding and also easy placement and removal of a card, a sub-card board, a modem sub-card, and a computer having this connector. In sub-card board connector 1 of the present invention, (1) first GND connections 11-1, 11-2 are placed on a surface facing the sub-card board 2 of the latches 7-1, 7-2 and when connecting the sub-card board to the connector, the sub-card board is grounded by having the first GND connections contact the first electrodes provided on the sub-card board; and/or (2) second GND connections 12-1, 12-2 are placed facing the sub-card board on a surface opposite to the latches of the latch supporting parts 6-1, 6-2 and when connecting the sub-card board to the connector, the sub-card board is grounded by having the second GND connections contact the second electrodes provided on the sub-card board. And this connector is incorporated in a computer.