Hi!!!
I have little problem. When i try to execute my program:

section .data

section .text
global _start
_start:
mov ah,00h
mov al,45h ;('45h' is just example)
int 10h

I get the message "Segmentation fault".
I suppose I get this message because my video card it's new model. Ati Radeon 3870hd.
I suppose this function and interrupt it's for video card models old 10 years maybe.
I use OS: LINUX and compilation with NASM.

Sorry for my English.