电脑音源切换控制器 用AT89C251+CD4016切换控制，可控制四路以上 的立体音源输入切换，一路立体声输出,有红外遥 控(SAA3010T电视遥控器，只处理四个音源)-computer audio switching controller with AT89C251 CD4016 switching control can control four or more three-dimensional audio input switching, one stereo outp

检测键盘对应的VK值(用于电视卡遥控器)-detection VK keyboard corresponding value (for the television remote control card)