利用BIOS功能调用在图形显示器上画矩形

data segment
x db 9 dup(?)
data ends
;
code segment
assume cs:code,ds:data
main proc far
mov bx,20h
lp1: mov ah,0ch
mov dx,20h
mov cx,bx
mov al,4h
int 10h
inc bx
cmp bx,60h
jbe lp1
mov bx,20h
lp2: mov ah,0ch
mov dx,bx
mov cx,20h
mov al,4h
int 10h
inc bx
cmp bx,60h
jbe lp2
mov bx,20h
lp3: mov ah,0ch
mov dx,60h
mov cx,bx
mov al,4h
int 10h
inc bx
cmp bx,60h
jbe lp3
mov bx,20h
lp4: mov ah,0ch
mov dx,bx
mov cx,60h
mov al,4h
int 10h
inc bx
cmp bx,60h
jbe lp4
mov ah,4ch
int 21h
main endp
code ends
end main