PC系列微机在ROM BIOS级上提供了两个键盘中断INT 16H和INT 9H。INT 9H中断是硬中断,当操作员击键时,无论是键被按下还是放开,INT 9H中断都立即被调用,该中断根据所按键的扫描码进行3种工作:①对于转换键,设置键盘状态(40:0017,40:0018);②对于普通字符键或组合键,将击键行为转换成ASCII码或扩展ASCII码,并写入键盘缓冲区;③对特殊组合键进行解释,执行相应的动作(例如Ctrl+Alt+Del,Shift+Prtsc等)。进入键盘缓冲区中的键盘编码,可由应用程序取出加以处理。这往往是通过INT 16H软中断的0号功能 The PC Series PC provides two keyboard interrupts INT 16H and INT 9H at the ROM BIOS level. The INT 9H interrupt is a hard interrupt. The INT 9H interrupt is invoked immediately when the operator keystroke, regardless of whether the key is pressed or released. The interrupt performs three types of operations based on the scan code of the key being pressed: Set the keyboard status (40: 0017, 40: 0018); ② For common character keys or key combinations, convert the keystroke behavior into ASCII code or extended ASCII code and write to the keyboard buffer; ③ Explain the special key combination, Execute the appropriate action (such as Ctrl + Alt + Del, Shift + Prtsc, etc.). Enter the keyboard buffer in the keyboard encoding, can be removed by the application to be processed. This is often done by INT 16H soft interrupt function no