avr - How is the 10-pin ICSP connected? - Electrical Engineering Stack Exchange
5pcs 10 Pin To 6 Pin Adapter Board Connector ISP Interface Converter AVR AVRISP USBASP STK500 Standard Geekcreit for Arduino - products that work with official Arduino boards
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
10-pin to 6-pin AVR ISP [I106] : ereshop, ereshop.com by ERE Company Limited.