the shield 24 is in the engaged position preventing inward pivoting of the shield about its narrow end 42 a computer motherboard not shown generally provides electrical interconnection to the other components in the enclosure 12 as well as additional physical support to the circuit board 22 an edge connector on the mother board is aligned to receive an edge connection along a side of the circuit board 22 perpendicular to the shield 24 when the shield 24 in the disengaged position this edge connection side of the circuit board 22 is adjacent to the extending tongue 34 of the shield 24 furthermore the edge connector of the motherboard is configured to be engaged to the edge connection of the circuit board 22 when the shield 24 is in the engaged position referring to fig4 and 5 a cover 20 includes features for secure mounting to the housing 18 the cover 20 provides a shield retainer 51 to cooperate with the tab opening 48 and advantageously the support member 45 to block the tab 36 in the engaged position in particular an inwardly opening cover curl 52 receives an outwardly bent lip 54 along the top edge of the tailgate 10 the curl 52 includes a tab cutout 56 to accommodate the tab 36 of the shield 24 a cover projection 58 extends from a portion of the curl 52 and registers at least to the tab opening 48 in the tailgate 10 the cover projection 58 also includes an outwardly projecting surface 59 registered to oppose the tab 36 from moving in the disengaging direction 43 since the illustrative version of the.