这是一个基于8255扩展端口的keil c51固件，实现对fat32硬盘的控制。网上还不太好找。-This is based on a 8255 expansion of the port Keil decoder firmware, the drive to achieve the right fat32 control. Not very easy to find online.

通过C51单片机对DS1302芯片进行控制来实现年月日，时分秒的设计，次设计充分利用51单片机的扩展功能，简单方便的实现日历时钟的控制-This program through the C51 to DS1302 chips for control to realize the date, when the design of the arc, time to make full use of 51 SCM design of the function expansion, simple to

51数字钟带各种扩展年，月，日等并且可预置。用汇编语言写的-51 digital clock with extended assembly language