Text mode question

the default text mode in DOS is 640x400 with 80x25 characters, and the characters being 8x16 pixels each, right? 80*8=640 so the 80 characters from left to right fit perfectly in the screen. You know these half foreground half background characters, like this:

 o o o o
o o o o
 o o o o
o o o o
 o o o o
o o o o
 o o o o
o o o o
 

It's exactly 8 pixels wide and 16 pixels high, so two of these next to each other should tile perfectly:

 o o o o o o o o
o o o o o o o o 
 o o o o o o o o
o o o o o o o o 
 o o o o o o o o
o o o o o o o o 
 o o o o o o o o
o o o o o o o o 
 

But in text mode, I see a line between both characters!!

 o o o o  o o o o 
o o o o  o o o o  
 o o o o  o o o o 
o o o o  o o o o  
 o o o o  o o o o 
o o o o  o o o o  
 o o o o  o o o o 
o o o o  o o o o 
 

That ugly line screws up text mode demos in my opinion!!! So they're actually 9x16 pixels! But then the 80 pixels width would require a screen resolution of 720 pixels wide, but the menu of my monitor clearly said it's 640. If you followed, how's this possible? Thanks a lot. [edited by - Boops on October 11, 2003 7:41:27 PM]