实验三 转移指令跳转原理及其简单应用编程

 

实验1

1.

 

可见 跳转的位移量为6

s1编号所在的下一条语句为MOV dl [si] 所以cpu直接将程序跳转到 此条语句处

 

2

 

可见 跳转的位移量为8

s1编号所在的下一条语句为MOV dx [si] 所以cpu直接将程序跳转到 此条语句处

实验二

1.ax=0021 bx=0026 cx=076c

2实验结果如图，call word ptr ds:[0] 将下一条指令的ip0021压入栈之后 pop ax后ax中的结果应该为0021

call dword ptr ds:[2] 指令将下一条指令的cs:ip压入栈，然后将ip 和cs依次出栈到bx,cx中，故bx-0026 cx=076c

实验三

assume cs:code, ds:data
data segment
    x db 99,72,85,63,89,97,55
    len equ $ - x       ;len = 7
data ends
code segment
start:
    mov ax, data
    mov ds, ax
    mov si, 0
    mov bl, 0ah    
    mov cx, len    

s: 
    mov al, [si]    
    mov ah, 0
    call printNumber   
    call printSpace    
    inc si          
    loop s
    jmp exit        

printNumber:       
    div bl         
    mov dl, ah     
    mov dh, al      
    add dl, 30h    
    mov ah, 2       
    int 21h         
    mov dl, dh
    add dl, 30h
    int 21h         
    ret

printSpace:    
    mov dl, ' '
    int 21h     
    ret

exit:          
    mov ah, 4ch
    int 21h
code ends
end start

　　

 

 

实验四

assume cs :code
data segment
	str db 'try'
	len equ $ - str
data ends

stack segment
    db 16 dup(0)
stack segment
	
stack ends

code segment
start:

mov ax, stack
mov ss, ax
mov sp, 16;初始化栈

MOV AX,0B800H
MOV es,AX		;使用 80x25 彩色字符模式，内存地址 0xB8000 - 0xBFFFFF
MOV di,0

mov bl, 02h 
call printstr


mov bl, 0Ch 
mov bh, 24  
mov al, bh 
mov dl, 0A0h 
mul dl 
mov di,ax
mov AX,0B800H
MOV es,AX		
call printStr

mov ah,4ch
int 21h	



printstr:
 
MOV CX,len
mov ax,data
mov ds,ax
mov si,0
	
s:  
	mov dx,[si]
	MOV es:[di],DX	;显示 ASCII 字符
    ADD di,1
    MOV es:[di],bl	;设置字符显示属性
    ADD di,1
	inc si
LOOP s

ret

code ends
end start

　　

 

实验五

assume cs:code,ds:data

data segment
stu_no db '201983290439'
len = $ - stu_no
data ends

code segment
start:
        mov ax,data
        mov ds,ax
        mov si,0
        mov cx,len

        mov ax,0B800H
        mov es,ax
        mov di,1

        mov al, 25   
        mov dl, 80    
        mul dl
        mov cx,ax     
        
        color:
            mov al,17h
            mov es:[di],al
            add di,2
        loop color

    mov bh, 24  
    mov al, bh 
    mov dl, 0A0h 
    mul dl 
    mov di,ax

    mov bh, 24  
    mov al, bh 
    mov dl, 0A0h 
    mul dl 
    mov di,ax
    mov AX,0B800H
    MOV es,AX	

    mov ax,34
    mov cx,ax
    print1:
        mov ax,'-'
        mov es:[di],ax
        mov es:[di+1],17h
     
        add di,2
    loop print1

    mov cx,len
    print:
        mov ax,[si]
        mov es:[di],ax
        mov es:[di+1],17h
        inc si
        add di,2
    loop print

    mov ax,34
    mov cx,ax
    print3:
        mov ax,'-'
        mov es:[di],ax
        mov es:[di+1],17h
        add di,2
    loop print3
        mov ah,4ch
        int 21h

code ends
end start