汇编第六章习题

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程序如下,编写code段中的代码,将a段和b段中的数据依次相加,将结果存到c段中。

a segment
    db 1,2,3,4,5,6,7,8
a ends

b segment
    db 1,2,3,4,5,6,7,8
b ends

c segment
    db 0,0,0,0,0,0,0,0
c ends

code segment

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start:  mov ax,a
        mov ds,ax
        mov bx,0
        mov cx,8
s:      mov al,ds:[bx]
        add al,ds:[16+bx]
        mov ds:[32+bx],al
        add bx,1
        loop s

        mov ax,4c00h
        int 21h


code ends
end start

程序如下,编写code段中的代码,用push指令将a段中的前8个字型数据,逆序存储到b段中。

assume cs: code
    a segment
        dw 1,2,3,4,5,6,7,8,9,0ah,0bh,0ch,0dh,0eh,0fh,0ffh
    a ends

    b segment
        dw 0,0,0,0,0,0,0,0
    b ends

code segment

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start:  mov ax,a
    mov ds,ax
    
    mov ax,b
    mov ss,ax
    mov sp,16

    mov bx,0
    mov cx,8
s:  push ds:[bx]
    add bx,2
    loop s
    
    mov ax,4c00h
    int 21h


code ends
end start