1.asm

来自「masm,debug,link还有上课时的源程序」· 汇编 代码 · 共 29 行

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 you code here

        mov bx,4321h
        and bx,11110000b
        mov cl,4
        shr bx,cl
        and ax,1111111111110000b
        add ax,bx
        ;Exit to DOS
        mov ah,4ch
        int 21h

code ends
        end start