实现dds的步进控制 步进100hz 步进值可调

多功能时钟/日历芯片PCF8563并同AT89C51结合-Multi-function clock/calendar PCF8563 chip combined with AT89C51

反汇编工具borg2.27源码，文件齐全-anti-compilation tools borg2.27 source, the complete document

AT89C2051时钟程序 -AT89C2051 clock procedures

软盘格式化程序,实现了对软盘的格式化。-the soft disk formatting,which enables the format of disk

门禁中韦根信号发送，汇编语言编写，５１单片机可用．-Wiegand Access Control in the signal sent, written in assembly language, 51 microcontroller is available.

TestOS - 带简单GUI的DOS扩展OS// 源代码// ASM// 英文 -TestOS-with simple dos distention OS of GUI//resource code//ASM//English

ASCII码转换成十六进制数 ,单字节ＢＣＤ码小数转换成单字节十六进制小数,双字节十六进制小数转换成双字节ＢＣＤ码小数,单字节十六进制数转换成双字节ASCII码 -ASCII conversion into hexadecimal number, single-byte BCD decimal converted into single-byte hexadecimal minority. double-byte hexadecimal decimal converted into double byte BCD minority. single-byte hexadecimal number into double byte ASCII, etc.

4x4键盘 P2作输入P1作输出(注意接线)-4x4 keyboard input P2 for P1 for output (note the connection)

地铁售票级，票价2～7元，可一次购买多种票价的票，最高张数为10张-Metro ticket class, the fare from 2 to 7 yuan, can be time to buy a variety of fare tickets, the maximum number of sheets of 10

该程序是判断某年是否是闰年，即输入任何一年份，若是闰年，则输出闰年，若不是，则输出不是闰年。