Format of Banyan VINES 3270 profile block:
Offset	Size	Description	)
 00h 64 BYTEs	gateway service name
 40h 16 BYTEs	gateway comm port address
 50h	WORD	primary logical unit number
 52h	WORD	secondary logical unit type
 54h	WORD	secondary logical unit number
 56h	WORD	printer assignment
 58h 50 BYTEs	keyboard definitions filename