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Amazon.com: Geekstory for ATMEL 51 AVR USB ISP ASP Microcontroller Programmer Downloader with Cable + 10Pin to 6Pin Adapter Board for Ender 3 or Ender 3 Pro : Electronics
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KeeYees 2 pieces downloader programmer for USBASP for ISP with cable and 10 pin to 6 pin adapter board for 51 for AVR series microcontroller: Amazon.de: Business, Industry & Science
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How to make Arduino AVR ISP Programmer with PCB | JLCPCB Review | Only $2 for PCB Prototype - YouTube
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