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Simple Serial Downloader for AT89S51/AT89S52
SDownldr.exe is a software to program a AT89S51/AT89S52 serially through the parallel port. This Software is included in the Microcontroller Project Circuit diagram for this ISP downloader is as follow: The Serial Downloader circuit above using the power supply from the parallel port. However, not all parallel port capable of providing enough current for this…