Format of Card Services Request I/O record:
Offset	Size	Description	)
 00h	WORD	logical socket number
 02h	WORD	base port 1
 04h	BYTE	size of port range 1
 05h	BYTE	attributes for port range 1 (see #00709)
 06h	WORD	base port 2
 08h	BYTE	size of port range 2
 09h	BYTE	attributes for port range 2 (see #00709)
 0Ah	BYTE	number of address lines (typically 16)
SeeAlso: #00718,#00716