INT 1A - Intel Plug-and-Play AUTO-CONFIGURATION - ???                           
	AX = B407h
	EDX = length of ???
	EDI = physical address of ???
Return: CF clear if successful
	    AX = 0000h
	    EDX = ???
	    EDI = ???
	CF set on error
	    AX = error code (FFFFh) (see #01243)
Notes:	returns error if EDI < 000C0000h or EDI+EDX > 00100000h
	seems to force EDI and EDX to align to 16K boundaries
SeeAlso: AX=B400h