计算机组成原理实验

1.应用汇编指令实现a+b+c，a,b,c的值均为ffffh，答案保存在4100h地址。Mov si,4000h

Mov [si],0ffffh

Mov [si+2],0ffffh

Mov [si+4],0ffffh

Mov ax,0

Mov [si+102],0

Mov ax,[si]

Add ax,[si+2]

Adc [si+102],0

Add ax,[si+4]

Adc [si+102],0

Mov [si+100],ax

2.实现地址空间4000H—4fff清零mov si,4000h

L1:mov [si],00h

inc si

cmp si,5000h

jnz l1

jmp $

3.将存储器4000h-4fffh范围内偶数地址的信息清零.要求所有代码放置在2dc0h.

code segment

assume cs:code

org 2dc0h

start :mov al,00h

mov bx,4000h

con1:mov [bx],al

add bx,0002h

cmp bx,5000h

jnc con1

jmp $

code ends

end start

4.

code segment

assume cs:code

org 2ce0h

start:

mov si,3fffh

mov dx,0000h

mov ax,65535 mov cx,10000

div cx

mov [si+1],al

mov ax,dx

mov dx,0000h

mov cx,1000

div cx

mov [si+2],al

mov ax,dx

mov dx,0000h

mov cx,100

div cx

mov [si+3],al

mov ax,dx

mov dx,0000h

mov cx,10

div cx

mov [si+4],al

mov [si+5],dx(dl)

jmp $

code ends

end start

5.设计一通用数据块间数据搬移程序。实现4000h-40ffh和4100h-41ffh 之间数据块的移动，代码段存储在2ef0h，程序只使用代码段进行缩写。code segment

assume cs:code

org 2ef0h

start:mov cx,0100h ；数据长度mov si,4000h ；源首地址mov di,4100h ；目的首地址cmp si,di ；比较源、目首地址大小ja fadr ；si>di fadr

add si,cx ；源末址+1

add di,cx ；目的末址+1 dec si ；

dec di

con1:mov al,[si] ；取源数mov [di],al ；写末数

dec si ；源地址-1

dec di ；目的址-1

dec cx ；长度-1

jne con1 ；未完继续jmp $

fadr:mov al,[si] ；取源数mov [di],al ；写目数

inc si ；源址+1

inc di ；目的址+1

dec cx ；长度+1

jne fadr ；未完继续jmp $

code ends

end start

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