Bitfields for OPTi 82C750 Vendetta (device 1) interrupt control:
Bit(s)	Description	)
 15	ISA IRQ14 blocking enable
 14	ISA IRQ15 blocking enable
 13	DMA/ISA master to preempt PCI master enable
 12	PCI priority is fixed instead of rotating
 11-10	back-to-back ISA I/O delay 
	00 = 3 ATCLKs
	01 = 12 ATCLKs
	10 = no delay
	11 = delay all by 12 ATCLKs
 9	PCI master ISA device access disable
 8	ISA bus control signals for memory access >16M and I/O access >64K
	  disable
 7-6	IRQ15-IRQ14 triggering (0 = edge, 1 = level)
 5-2	IRQ12-IRQ9 triggering (0 = edge, 1 = level)
 1	IRQ 5 triggering (0 = edge, 1 = level)
 0	pin AE16 functionality
	0 = DREQ6
	1 = EPMI0#
SeeAlso: #00939,#00940