Power Mac 8100 Quadra 800 840AV – NuBus Card Retainer $10.00 Secure the Expansion cards Power Mac 8100 Quadra 800 840AV - NuBus Card Retainer quantity Add to cart Add to Quote Continue Shopping Category: Power Mac 8100-8500 Quadra 800 Description Apple 922-0393, 815-1311. NuBus Card Retainer for the Power Mac 8100, WS 8150, Quadra 800 & 840AV