汇编钢琴程序，本程序将键盘变成钢琴键盘，选择键盘上21个按键，作为低、中、高音21度音。通过此程序驱动PC机扬声器发出不同的音调。-Piano compilation process, the process will become a piano keyboard keyboard, choice of 21 keys on the keyboard, as low, middle and treble tone 21 degrees. Through this process-driven PC-tone different from loudspeakers.