现代微机原理与接口技术 ●程序如下: mov al. 82h out 63. al begin: mov al,0;检查是否有键按下 out 60h. al wait n al. 6lh and al. oth cmp al, Ofh jz wait;无键按下,继续等待 Department of Computer Science Engineering 4 算机科学与工程系 http://qsyang.yeah.nethttp://qsyang.yeah.net 现代微机原理与接口技术 4 • 程序如下： mov al, 82h out 63h, al begin: mov al, 0 ;检查是否有键按下 out 60h, al wait: in al, 61h and al, 0fh cmp al, 0fh jz wait ；无键按下，继续等待