一个AT89S8253的ISP下载程序（有原理图，上位机程序，固件程序），国外网站上的。经本人汉化，现已制作成功，证实能用。,An ISP download the AT89S8253 (with schematics, PC program, firmware program), abroad on the site. After I finished, the production has been successful, can be confirmed.