Avanti supports up to four PCI slots.  The slots appear as tabs in the Configuration Utility.  The PCI tabs are labeled pci6, pci11, pci12, and pci13, which are the same PCI slot id’s in use on a real AlphaServer 400.  On the real server, pci6 is reserved for the SCSI controller integrated on the main board.  Each PCI slot can be assigned a SCSI controller or a Network card via a drop-down menu at the top of the tab.  Not all PCI slots need to be assigned to build a working virtual Alpha system.