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Microwulf's "south" view, showing the four motherboards, with 2 Gigabit Ethernet adaptors per motherboard (black cable to the on-board adaptor, green cable to the PCI-Express adaptor). The bottom motherboard is the "master" node, so it has a 10/100 Ethernet adaptor in one of its PCI slots (yellow cable) for access to the outside world, and the monitor (blue cable) is plugged into its VGA port.