INT 6B - DECnet DOS - PORTIBM PC Portable (uses same BIOS as XT) DRIVER
InstallCheck:	test for a signature area (see #03729) immediately preceding
	  the interrupt handler
SeeAlso: INT 6A"DECnet",INT 6C"DECnet"
Index:	installation check;DECnet DOS Port Driver


Format of DECnet DOS signature area:
Offset	Size	Description	(Table 03729)
 -5	BYTE	major version number
 -4	BYTE	minor version number
 -3   3 BYTEs	signature (ASCII "PDV")