I just tried to help you but you ignored my questions. Is it the int 10h that displays the number? Where is the number displayed - on a PC screen? What do you want to change to 60,80,50 (i.e. what is it now, cos I can't see anything in the program that looks like it might change easily to that)? Why do you think you might need a stack?
Don't assume that the development system you're working on is the only one in the world, or that we all know exactly what you're talking about.