This byte indicates the specific register-level programming interface used by the device. In the early days of PCI, this allowed the OS to pick a generic driver if a specific one wasn't available. For standard Ethernet controllers (CC-0200), this is almost always 0x00 .
PCI Exception CC-0200 – Action Required Pci Cc-0200
The [8086:15b8] is the specific hardware ID you need for drivers. : Open Device Manager . Right-click your Ethernet Controller > Properties . Pci Cc-0200
