一个很好的为AT89序列下载程序并烧录程序的软件，为你提供一个最佳的仿真效果。-A good sequence for the AT89 download and burn process software, in order to provide you with the best simulation effect.

51编程器，用于at89系列的单片机，很不错的-51 programmer for at89 series of single-chip, very good

4x4 keyboad for interfacing, AT89 series 40 pins