2’s Compliment

.model small

.data

a dw 1234H

.code

            mov      ax, @data       

            mov      ds, ax

            mov      ax, a                

            mov      cx, 16              

up:        rcl        ax, 1                

            cmc                             

            loop     up                   

            rcl        ax, 1                

            add      ax, 1                

           

            mov      ah, 4cH

            int  3H

            end