Format of Card Services Request IRQ record:
Offset	Size	Description	)
 00h	WORD	logical socket number
 02h	WORD	attributes (see #00708)
 04h	BYTE	(ret) assigned IRQ number, if successful
 05h	BYTE	IRQ info (see #00719)
 06h	WORD	bitmap of available IRQs (bit 0 = IRQ0, etc.)
		(only if bit 4 of IRQ info set)
SeeAlso: #00717,#00716