Bitfields for OPTi 82C750 Vendetta (device 1) interrupt multiplexing control:
Bit(s)	Description	)
 15	pin functionality
	0 = AE22:IRQ3, AF21:IRQ5, AE21:IRQ6, AD21:IRQ7, AE20:IRQ9, AF19:IRQ11
	1 = AE22:MIRQ3/5, AF21:MIRQ7/9, AE21:MIRQ11/15, 
	    AD21:EPMI1#, AE20:EPMI2#, AF19:GMIRQ
 14	pin R22 functionality (0 = PREQ2#, 1 = EPMI0#)
 13	IRQ1 latching enable
 12	IRQ12 latching enable
 11	DACKEN# status (0 = active low, 1 = active high)
 10	system bus owned by external device
 9	flash ROM locking enable
 8	reserved
 7	IRQ6 triggering (0 = edge, 1 = level)
 6-3	IRQ generation when GMIRQ triggered
	0000 = disabled
	0001-0010 = reserved
	0011-0111 = IRQ3-IRQ7
	1000 = reserved
	1001-1100 = IRQ9-IRQ12
	1101 = reserved
	1110-1111 = IRQ14-IRQ15
 2	reserved (1)
 1	priority scheme enable
 0	concurrent refresh and IDE cycle enable
SeeAlso: #00939,#00949