实现使用单片机设计电子琴，运用4*4行列式矩阵，8个按键任意组合-MCU designed to achieve the use of electronic organ, using 4* 4 determinant matrix, any combination of eight key

4*4行列式矩阵键盘演示程序,8051的汇编，一个基本的小程序-4* 4 determinant matrix demonstration program, the keyboard 8051 assembly, a basic small programs