cisco access list

hi
i have a 26oo router that was installed by a vendor, i typed “sh running conf” and i saw that interface e0 has access list 120 configured. i tried to view the content of the access list, by typing show access list 120 but the output was just blank, i also typed “sh ip interface” but no success. the question is, how can i see the content of the access list.
also how can i set mt tftp server address (or ip?) so i can backup to it?