Something I never understood

[Caldaron]

Hey guys!
I just got myself caught in a problem some time ago which i don't really understand that just freaks me off and makes me wanna explode so that i just have to ask right now.
why the hell is a character's real_x coordinate 128* the tileset x coordinate and not the 32* (20 * 32 = 640: the screen width, 20 * 128 = 2560... WTF)???

thought someone could help me out with this,
Kisses :-*

 

[BwdYeti]

I'm fairly certain it's so if a character moves less than a pixel in a direction per frame they will still move smoothly, without using decimal numbers for real locations.