i don't know if it works on ROM 1.00 or ROM 1.05, but I have TI89 with Hardware Version 2.00 and AMS version 2.03 and i did the following: [F5] [Diamond] [Clear] [Catalog] [ESC] then i got a nice "Address Error". is it bug? __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com