基于stc89c51单片机的ps2键盘输入，并在lcd1602显示器上实时地显示，显示的字符为1602自带的字符集所能提供的字符。(PS2 keyboard input based on the STC89C51 microcontroller, and real-time display in the LCD1602 display, the characters displayed for LCD1602, with the characters provided by the set ca