课后实验

实验一

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
assume cs:code,ds:data,ss:stack

data segment
dw 0123h,0456h,0789h,0abch,0defh,0fedh,0cbah,0987h
data ends

stack segment
dw 0,0,0,0,0,0,0,0
stack ends

code segment

start:
mov ax,stack
mov ss,ax
mov sp,16

mov ax,data
mov ds,ax

push ds:[0]
push ds:[2]

pop ds:[2]
pop ds:[0]

mov ax,4c00h
int 21h

code ends
end start
  1. 程序返回前,data段中的数据如下:

  1. 程序返回前,cs = 076C, ss=076B,ds=076A
  2. code段地址如果为X,data段地址为 X-32, stack段地址为X-16

实验二

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
assume cs:code,ds:data,ss:stack

data segment
dw 0123h,0456h
data ends

stack segment
dw 0,0
stack ends

code segment

start:
mov ax,stack
mov ss,ax
mov sp,16

mov ax,data
mov ds,ax

push ds:[0]
push ds:[2]

pop ds:[2]
pop ds:[0]

mov ax,4c00h
int 21h
code ends
end start
  1. 执行程序,返回前,data段中的数据为多少

  1. 程序返回前,cs=076C,ss=076B,ds=076A
  2. code段地址为X,data段地址为 X-32, stack段地址为 X- 16

实验五

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
assume cs:code

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

start:
mov ax,a
mov ds,ax

mov ax,b
mov ss,ax

mov ax,c
mov es,ax

mov cx,8
mov bx,0
mov dl,0
s:
add dl,ds:[bx]
add dl,ss:[bx]
mov es:[bx], dl
mov dl,0
inc bx
loop s

mov ax,4c00h
int 21h
code ends
end start

将a和b中的数据求和,放到c里面

执行完成后放在 es 中

实验六

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
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

start:
mov ax,b
mov ss,ax
mov sp,10h

mov ax,a
mov ds,ax

mov cx,8
mov bx,0
s:
mov dx,ds:[bx]
push dx
inc bx
inc bx
loop s
mov ax,4c00h
int 21h
code ends

end start

将a中的前8个字型数据逆序压入到b中,(注意字型数据是小端存储的)