Identifies the generic function of the device. Base Sub- Prog Class Class If. Meaning 00h Device built before Class Code definitions were finalized. 00h 00h All currently implemented devices except VGA compatible devices. 01h 00h VGA compatible device 01h Mass Storage controller 00h 00h SCSI bus controller 01h 00h IDE controller 02h 00h Floppy disk controller 03h 00h IPI bus controller 80h 00h Other mass storage controller 02h Network controller 00h 00h Ethernet controller 01h 00h Token Ring controller 02h 00h FDDI controller 80h 00h Other network controller 03h Display controller 00h 00h VGA compatible controller 01h 00h XGA controller 80h 00h Other display controller 04h Multimedia device 00h 00h Video 01h 00h Audio 80h 00h Other multimedia device 05h Memory controller 00h 00h RAM 01h 00h Flash 80h 00h Other memory controller 06h Bridge device 00h 00h Host bridge 01h 00h ISA bridge 02h 00h EISA bridge 03h 00h MC bridge 04h 00h PCI-to-PCI bridge 05h 00h PCMCIA bridge 80h 00h Other bridge device 07h-FEh Reserved FFh Device does not fit in any defined classes.