Amazon.com: for ATMEL 51 AVR USB ISP ASP Microcontroller Programmer Downloader with Cable + 10Pin to 6Pin Adapter Board for Ender 3 or Ender 3 Pro Geekstory : Electronics
Amazon.com: USB AVR Programmer w/ 6-Pin 10-Pin IDC ISP Connector for USBASP : Electronics
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DIY 3pcs 3.3V / 5V USBASP USBISP AVR Programmer Downloader USB ISP ASP ATMEGA8 ATMEGA128 Support Win7 64K Over-Current Protection Function with Download Cable : Electronics
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10 Pin to Standard 6 Pin Adapter Board + USBASP USBISP AVR Programmer USB ATMEGA8 ATMEGA128 ATtiny/CAN/PWM for Arduino: Amazon.com: Industrial & Scientific