0

我需要编写汇编代码，以文本模式存储在屏幕上（在 dosbox 中）写的内容，清除屏幕然后恢复以前写的内容，所以我写了这段代码，但它似乎无法正常工作..谁能指出为什么？我会很感激

PS：我还是菜鸟

这是我的代码：

Dataseg segment
    Data_seg dw 2000 dup(?)
Dataseg ends


Codeseg segment

Main PROC  far   

            assume ds:Dataseg,cs:Codeseg,ss:stackseg

        Mov ax,Data_seg
        Mov es,ax
        Mov ax,0b800h
        Mov ds,ax       
        Mov cx,25*80 ;(rows)*cols-default for screen

        Mov di,OFFSET Data_seg
        Mov si,0   
        CLD             ;autoincrement
        Rep movsw


        ;now clearing the screen

        Mov cx,25*80
        Mov ax,0b800h
        Mov es,ax
        Mov ax,0720h
        Mov di,0
        Rep stosw


        ;now restoring the contents of the screen
       Mov ax,Data_seg
       Mov ds,ax
       Mov cx,25*80
       Mov di,0
       Mov si,OFFSET Data_seg
       Rep movsw





     Mov Ah,4ch
     Int 21h


Main endp
Codeseg ends
     end Main
4

2 回答 2

0

您混淆了“Dataseg”（段的名称）和“Data_seg”（变量的名称）。Mov ax,Data_seg加载变量的偏移量Data_seg，而不是段。加载段有两个选项：

Mov ax, SEG Data_seg    ; Load the segment of variable Data_seg

或者

Mov ax, Dataseg         ; Load the segment called "Dataseg"
于 2014-11-22T19:22:22.400 回答
0

代替：

Mov ax,Data_seg
Mov es,ax
Mov ax,0b800h
Mov ds,ax
Mov di,OFFSET Data_seg
    Mov si,0

经过：

push cs
pop es
mov di, OFFSET Data_seg
Mov ax,0b800h
Mov ds,ax 
xor si, si ;set pointer to the beginning of the screen

代替：

   Mov ax,Data_seg
   Mov ds,ax
   Mov cx,25*80
   Mov di,0
   Mov si,OFFSET Data_seg
   Rep movsw

经过：

   push cs
   pop ds
   mov ax, 0b800h
   mov es, ax
   Mov cx,25*80
   Mov di, 0
   Mov si,OFFSET Data_seg
   Rep movsw
于 2014-11-23T13:27:33.657 回答