Probably one of the most
famous interrupts on the
x86 architecture, Interrupt 10h (h =
hexadecimal) is probably best known for switching
video modes:
mov AH, 00h ; I want to set the video mode...
mov AL, 03h ; ...to 80x25x16
int 10h ; Call video interrupt
int 10h can also do other nifty things like working with
cursor position, setting the active
video page (for modes that support it), and even reading
light pen coordinates.
(By the way, the two mov statements above could have been compressed to a single mov AX, 0300h, since AX is a 16-bit register, of which AH and AL are the High and Low bytes.)