;将AX寄存器中的16位数分成4组,然后把这4组数分别放在AL,BL,
;CL和DL中.
data segment
p1 db 4 dup(?)
data ends
code segment
assume cs:code,ds:data
start:  mov ax,data
        mov ds,ax
        mov cl,4
        mov ch,4  
        lea bx,p1
        mov ax,1fffh
a1:     push ax
        and ax,0fh
        mov [bx],al
        inc bx
        pop ax
        shr ax,cl
        dec ch
        jnz a1
        mov dl,p1
        mov cl,p1+1
        mov bl,p1+2
        mov al,p1+3
        mov ah,4ch
        int 21h
code ends
        end start