详细介绍了ISP下载线制作的过程，里面有电路图和各种电器的型号参数，该下载线能为很多拥有笔记本的朋友们解除usb转rs232的烦恼。而且成本很低-ISP download cable described in detail the process of production, there are a variety of electrical circuit diagrams and model parameters, the download cable for a lot of friend