有关统计学生成绩的汇编程序，详见压缩文件内容

此程序用164扩展键盘和显示功能，最大限度的少用IO口-Expansion of this program with 164 keyboard and display functions, to maximize the use of the IO I

霍夫曼编码器的实现（霍夫曼编码不具有唯一性，通过建立霍夫曼树实现）、实现图的遍历（前—中—后等不同顺序）、教学计划编制问题、快速排序、优先队列与堆

89S51 与数码管显示器以及键盘SW 对应引脚的联机为： P0.0-------------------------数码管显示器的a脚 P0.1-------------------------数码管显示器的b脚 P0.2-------------------------数码管显示器的c脚 P0.3-------------------------数码管显示器的d脚 P0.4-------------------------数码管显示器的e脚 P0.5-------------------------数码管显示器的f脚 P0.6-------------------------数码管显示器的g脚 P0.7-------------------------数码管显示器的dp脚 ； P2.2-------------------------数码管显示器1的驱动脚 P2.3-------------------------数码管显示器2的驱动脚 P2.4-------------------------数码管显示器3的驱动脚 P2.5-------------------------数码管显示器4的驱动脚 P2.6-------------------------数码管显示器5的驱动脚 P2.7-------------------------数码管显示器6的驱动脚 ； P2.2-------------------------键盘SW1 P2.3-------------------------键盘SW2 P2.4-------------------------键盘SW3 P2.5-------------------------键盘SW4 P2.6-------------------------键盘SW5 P2.7-------------------------键盘SW6-devised with the digital control display and keyboard SW corresponding pin online : P0.0------------------------- Digital Display of a foot P0 .1--------

源程序，及程序运行截图，以及详细的程序说明报告，-source, and running screenshots, and the detailed description of the procedures for reporting, thank you

大小写转换- The big small letter transforms

调试通过了的基于89S51的1602液晶显示的程序-Debug adopted 89S51-based liquid crystal display of the 1602 procedure

MCS51四字节除法运算程序，可计算出四字节的商和四字节的余数。-mcs51 division operation routine for tetra-byte ,may calculate both quotient of tetra-byte and remaining of tetra-byte

具有关机记忆功能的定时器程序，工厂生产流水线用。-With memory function timer shutdown procedures, factory production lines to use.

蜂鸣器在单片机上的应用,汇编语言,附原理图及说明学习文档 蜂鸣器的正极性的一端联接到5V电源上面，另一端联接到三极管的集电极，三极管的基级由单片机的P2.4管脚通过一个与非门来控制， 用户可以通过程序控制P2.4管脚的置低和置高来使蜂鸣器发出声音和关闭。 蜂鸣器的声音大小及音调可以通过调整P2.4管脚的置高时间及输出的波形进行控制，这一点可以在调试程序的时候来试验。-On the buzzer in single-chip applications, assembly language, with a schematic diagram and instructions to study documents the positive polarity of the end of the buzzer connected to the 5V power supply above, the other end connected to the transistor" s collector, the base level by the single-chip transistor Machine P2.4 pin through a NAND gate to control, the user can be programmed to set pin P2.4 low and set high to make the buzzer sound on and off. Buzzer sound size and pitch can be set by adjusting the P2.4 pin of the high time and output waveform control, and this point could be the time to test the debugger.

出租车计价器的汇编源程序 比较周全的考虑了实际中所会碰到的问题-the taxi program