Olle, what it means pin 17 in wich ic ? in the 40000-5fffff area there is nothing (in my internal ROM 1.11), but some models has a ROM in this area. if we use A1..A19 in the way tha the rom does and uses *we taken from the on board chip, i think the mem can be upgraded, but not saw from the ti OS, but with a modified FARGO (or TIE) we can access this area as a ram disk or something. what you think. ?