Atari manuals are probably the best for this.
 
Mame is not bad but not always correct.
 
Ultimately you will want to learn binary math & how addressing is done so you can look at a schematic & determine the locations of various hardware yourself.
 
Kev
 

I am having a hard time understanding how memory locations and how registers work,, is their a book or courses that anyone can suggest  , no one teaches this any more, I took a digital course at the local collage ,they just touched on this part not enough to really understand and they did not go over memory 

I want to be able to use my fluke 9010 to trouble shoot these arcade boards,, but when it gives loop info how to  trace this back to a chip ,, any help would be great ,

how did all of you learn this ?????