-a
100 mov dl, 45 ( which dl=E )
102 mov ah,2 ( which 2 is a function to save value from dl)
104 int 21 ( function interupt that will print value on screen)
106 sub dl,1 ( sub value of E 1 value )
109 cmp dl,0 ( to compare dl =0 )
10C jne 104 ( if dl not equal 0, will jump to offset 104 )
-r to show all status before คำสัง
-t to run 1 by 1 คำสัง
