程序如下-
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assume cs:code
code segment
start:mov ax,cs
mov ds,ax
mov si,offset do0
mov ax,0
mov es,ax
mov di,200h
mov cx,offset do0end-offset do0
cld
rep movsb
mov ax,0
mov es,ax
mov word ptr es:[0*4],200h
mov word ptr es:[0*4+2],0
mov ax,1000h
mov bh,1
div bh
mov ax,4c00h
int 21h
do0:jmp short do0start
db "divide error!"
do0start:mov ax,cs
mov ds,ax
mov si,202h
mov ax,0b800h
mov es,ax
mov di,12*0a0h+2*32
mov cx,13d
s:mov al,[si]
mov es:[di],al
inc si
add di,2
loop s
mov ax,4c00h
int 21h
do0end:nop
code ends
end start
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AX=0000 BX=0000 CX=0000 DX=0000 SP=0000 BP=0000 SI=0065 DI=0231
DS=0C1C ES=0000 SS=0C1C CS=0C1C IP=0021 NV UP EI PL NZ NA PO NC
0C1C:0021 26 ES:
0C1C:0022 C70602000000 MOV WORD PTR [0002],0000 ES:0002=00A7
-t
AX=0000 BX=0000 CX=0000 DX=0000 SP=0000 BP=0000 SI=0065 DI=0231
DS=0C1C ES=0000 SS=0C1C CS=0C1C IP=0028 NV UP EI PL NZ NA PO NC
0C1C:0028 B80010 MOV divide error!
-t
AX=1000 BX=0000 CX=0000 DX=0000 SP=0000 BP=0000 SI=0065 DI=0231
DS=0C1C ES=0000 SS=0C1C CS=0C1C IP=002B NV UP EI PL NZ NA PO NC
0C1C:002B B701 MOV BH,01
-t
AX=1000 BX=0100 CX=0000 DX=0000 SP=0000 BP=0000 SI=0065 DI=0231
DS=0C1C ES=0000 SS=0C1C CS=0C1C IP=002D NV UP EI PL NZ NA PO NC