HexCheat:

Ok first go into dos and start a new game of Ultima8 then after the part where devon finds you save it then go out of the game and type "cd gamedat" then type "edit" and then put the following lines into it

E12A
0101
W
Q

then save the file as avatar.deb make sure its .deb then quit out to the dos promnt and type "debug avatar.dat < avatar.deb" press enter now type "cd.." now "u8" and load up the saved game u saved earler now single click the avatar and u will get a cheat menu oh and also if u press ctrl+f1 its will give you yet anyother cheat menu.

HeX-Cheat:

Use a hex editor to edit the file AVATAR.DAT. (in
the GAMEDAT directory)

Change offset 2A to 01, and 2B to 01. Then reload the game and click on yourself. Press F7 for the same cheat menu, CTRL+F1 for a list of other things, and CTRL+F4 for immortality.

If you want to see the ending, make a file called I81B4U83.ICU with anything in it and put it in the STATIC directory. Now there should be an option of seeing the endgame sequence in the avatars' diary, as well as a quotes section.

Using an existing or new saved game in FIRST slot, simply type the below at the DOS Prompt :-

DEBUG
NU8SAVE.000
L
E 05F8 78 -- (Maximum Strength)
E 05F9 78 -- (Maximum Dexterity)
E 05FA 78 -- (Maximum Intelligence)
E 05FB F0 -- (Maximum Hit Points)
E 0625 C8 -- (Maximum Mana)
W

Tips:

In the main menu choose "credits" and then wait till the credits end. After that a new option called "Quotes" will appear.