INT 61 - Banyan VINES - GET REVISION NUMBER                                     
	AH = 02h
	DS:DX -> 2-byte buffer for result
Return: AX = 0000h installed
	    DS:DX buffer contains revision number as
		10000d * major_ver + 100d * minor_ver + patch_revision
SeeAlso: AH=01h"VINES",AH=04h"VINES",AH=07h"VINES"