第13章 int指令
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1.
assume cs:code
code segment
start: mov ax,cs
mov ds,ax
mov si,offset show
mov ax,0
mov es,ax
mov di,200h
mov cx,offset showe-offset show
cld
rep movsb
mov ax,0
mov es,ax
mov word ptr es:[7ch*4],200h
mov word ptr es:[7ch*4+2],0
mov ax,4c00h
int 21h
show: push ax
push dx
mov ah,9
mov dx,si
int 21h
pop dx
pop ax
iret
showe:nop
code ends
end start
1-a
assume cs:code
data segment
db "welcome to masm! ",0
data ends
code segment
start: mov dh,10
mov dl,10
mov cl,2
mov ax,data
mov ds,ax
mov si,0
int 7ch
mov ax,4c00h
int 21h
code ends
end start
1-b
assume cs:code
code segment
start: mov ax,cs
mov ds,ax
mov si,offset showstr
mov ax,0
mov es,ax
mov di,200h
mov cx,offset showe-offset showstr
cld
rep movsb
mov ax,0
mov es,ax
mov word ptr es:[7ch*4],200h
mov word ptr es:[7ch*4+2],0
mov ax,4c00h
int 21h
showstr:push bx
push cx
push dx
push di
mov ax,0b800h
mov es,ax
mov al,dl
dec al
mov ah,0
add ax,ax
mov di,ax
mov dl,dh
mov al,160
mul dl
add di,ax
mov bh,cl
show: mov cl,ds:[si]
mov ch,0
jcxz ok
mov bl,ds:[si]
mov es:[di],bx
inc si
add di,2
jmp show
ok: pop di
pop dx
pop cx
pop bx
mov ax,4c00h
int 21h
showe:nop
code ends
end start
2.
assume cs:code
code segment
start: mov ax,cs
mov ds,ax
mov si,offset lp
mov ax,0
mov es,ax
mov di,200h
mov cx,offset lpe-offset lp
cld
rep movsb
mov ax,0
mov es,ax
mov word ptr es:[7ch*4],200h
mov word ptr es:[7ch*4+2],0
mov ax,4c00h
int 21h
lp: push bp
mov bp,sp
dec bx
jcxz lpret
add [bp+2],bx
lpret: pop bp
iret
lpe: nop
code ends
end start
2-a
assume cs:code
code segment
start: mov ax,0b800h
mov es,ax
mov di,160*12
mov bx,offset s-offset se
mov cx,80
s: mov byte ptr es:[di],'!'
add di,2
int 7ch
;loop s
se: nop
mov ax,4c00h
int 21h
code ends
end start
3.
assume cs:code
code segment
s1: db 'Good,better,best,','$'
s2: db 'Never let it rest,','$'
s3: db 'Till good is better,','$'
s4: db 'And better,best.','$'
s: dw offset s1,offset s2,offset s3,offset s4
row: db 2,4,6,8
start: mov ax,cs
mov ds,ax
mov bx,offset s
mov si,offset row
mov cx,4
ok: mov bh,0
mov dh,ds:[si]
mov dl,0
mov ah,2
int 10h
mov dx,ds:[bx]
mov ah,9
int 21h
inc si
add bx,2
loop ok
mov ax,4c00h
int 21h
code ends
end start
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