Bitfields for Card Services Request IRQ info flags:
Bit(s)	Description	)
 7	IRQ is shared
 6	pulse (edge-triggered) interrupt
 5	level interrupt
 4	use IRQ bitmap
--- bit 4 set ---
 3	vendor-specific interrupt
 2	bus error
 1	I/O check interrupt
 0	NMI
--- bit 4 clear ---
 3-0	IRQ number
SeeAlso: #00718