My first download cable = 25-pin parallel port+HC373+ homemade circuit board (placed in parallel socket). No firmware needed.ofuse after soldered. With EASY51 PC program, suitable for beginners.

pcb\Backup of 89S51EP(ISP).Sch
...\Backup of WNGS51ISP.PCB
...\ISPDownloadsop.Ddb
...\Previous Backup of 89S51EP(ISP).Sch
图解S51并口下载线的制作.doc
pcb

• We are an exchange download platform that only provides communication channels. The downloaded content comes from the internet. Except for download issues, please Google on your own.
• The downloaded content is provided for members to upload. If it unintentionally infringes on your copyright, please contact us.
• Please use Winrar for decompression tools
• If download fail, Try it againg or Feedback to us.
• If downloaded content did not match the introduction, Feedback to us，Confirm and will be refund.
• Before downloading, you can inquire through the uploaded person information

Nothing．