data segment
        first dw 3456h
        second dw 0abcdh
        ans dw 0000h
data ends

code segment
        assume cs:code, ds:data
start :
        mov ax, data
        mov ds, ax

        mov ax, first
        and ax, 00ffh
        shl ax, 08h

        mov bx, second
        and bx, 00ffh
        or ax, bx
        mov ans, ax

        mov ax, 4c00h
        int 21h
code ends
        end start