1-4.asm

masm,debug,link还有上课时的源程序

data segment para

data ends

stack segment para stack 'stack'
        db 64 dup(?)
stack ends

code segment  public
        assume cs:code, ds:data,ss:stack,es:data
start:
        ;Begin
        mov ax,data
        mov ds,ax
        ;Add your code here

        and ax,0000111111111111b
        add ax,1101000000000000b

        ;exit to DOS
        mov ah,4ch
        int 21h

code ends
        end start