Can someone give me a walktrough for Ultima IV?
A step for step walktrough, unlike the one in the Ultima codex.

For an open world game like Ultima IV a step by step walkthrough is quite difficult. It would be just one of countless ways of completing the game.

I always found Dan Simpson's walkthrough to be quite comprehensive:

http://db.gamefaqs.com/computer/doswin/file/ultima_iv.txt

It tells you what you what you need to know about the game and where to find stuff. You can then do things the way you like. You might also want to take a look at his maps:

http://db.gamefaqs.com/computer/doswin/file/ultima_iv_castles.png
http://db.gamefaqs.com/computer/doswin/file/ultima_iv_abyss_l6.png
http://db.gamefaqs.com/computer/doswin/file/ultima_iv_dungeons.png
http://db.gamefaqs.com/computer/doswin/file/ultima_iv_towns.png
http://db.gamefaqs.com/computer/doswin/file/ultima_iv_villages.png

You can get all of that stuff here:

http://www.gamefaqs.com/pc/562660-ultima-iv-quest-of-the-avatar/faqs

I agree with the above post, but you know, it's a lot more gratifying if you don't use a walkthrough! ;)
I understand why you may want one though.