!rant

Question: I am working on learning MVC/MVP/MVVM/MVPVM and I have read a bunch of articles and done some tutorials but I need some help relating it to n-tier (I think that's what they're called) systems.

I have worked on and I am used to the Presentation (ui) layer > BAL > DAL > DB pattern. How does MVC (and others) relate to the different tiers in a tiered system? I have read that model == DAL, controller == BAL, and view == presentation layer, but I have also read that MVC is meant to extract the presentation layer and that business logic and data logic should be used elsewhere. Can I get some clarity?