in addition to the good suggestions already mentioned ...

nicolai morrisson has a pretty good list of notch codes
http://web.archive.org/web/201107150..._ref/filmdata/
( sadly i had to consult mr peabody for help ! )

and this is in the articles section here on apug
http://www.apug.org/forums/forum230/...tch-codes.html

good luck !
john