title: The value of bl when calling int 10h
body: <p>I am trying to write a boot sector that prints a string to the screen. I am using nasm. My tutorial says that when calling int 10h you have put the value 07h into bl. This is the color of your text. I tried changing the value of bl to 08h but it did not print anything! So I tried changing it to 06h and still nothing! Is it possible to change the color using the value in bl?
  If so what value matches what color?</p>
  
  <p>If I change the value in ah will int 10h do something else (for example scan text into al)?</p>