Format of Extended System Configuration Data PnP ISA ECD Extension Function:
Offset	Size	Description	)
 00h	WORD	001Eh (length of this structure)
 02h	BYTE	01h (selection size)
 03h	BYTE	00h (selection data)
 04h	BYTE	C0h (function information byte) (see #01252)
 05h	BYTE	18h (size of following free-format data)
 06h 16 BYTEs	freeform board header (see #01246)
 16h  8 BYTEs	Plug-and-Play board ID (see #01248)
Note:	ECD = Extended Configuration Data; this structure must be the last
	  "function" for a particular ISA Plug-and-Play board
SeeAlso: #01250