编程实现：在屏幕上中央显示出红底黄字。

利用汇编语言编程，实现在屏幕中央显示红底黄字。

code segment
assume cs:code

mov ah,6
mov al,0
mov ch,0
mov cl,0
mov dh,24
mov dl,79
mov bh,7
int 10h

poscurse:
mov ah,2
mov dh,16
mov dl,30
mov bh,0
int 10h
mov ah,6
mov al,1
mov ch,8
mov cl,30
mov dh,16
mov dl,50
mov bh,11001110b
int 10h

mov cx,20

getchar:
mov ah,1
int 21h
cmp al,'Q'
jz exit

loop getchar
jmp poscurse
exit:
mov ax,4c00h
int 21h
code ends
end

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