Format of Extended System Configuration Data Board Header:
Offset	Size	Description	)
 00h	WORD	length of this header in bytes
 02h	BYTE	slot number
		00h motherboard
		01h-0Fh ISA/EISA
		10h-40h	PCI
 03h	BYTE	reserved (00h)
SeeAlso: #01244,#01246