Bitfields for OPTi 82C750 Vendetta (device 1) USB interrupt control register:
Bit(s)	Description	)
 7	reserved
 6-5	buffered DMA control
	00 = original DMA with old protocol
	01 = reserved
	10 = original DMA with PCI master capability
	11 = buffered DMA enable
 4	reserved
 3-0	IRQ generation when USBIRQ triggered
	0000 = disabled
	0001-0010 = reserved
	0011-0111 = IRQ3-IRQ7
	1000 = reserved
	1001-1100 = IRQ9-IRQ12
	1101 = reserved
	1110-1111 = IRQ14-IRQ15
SeeAlso: #00939