boards.txt loading from sketchbook/hardware folder is broken · Issue #1370 · arduino/Arduino · GitHub
GitHub - MCUdude/MightyCore: Arduino hardware package for ATmega1284, ATmega644, ATmega324, ATmega324PB, ATmega164, ATmega32, ATmega16 and ATmega8535
GitHub - MCUdude/MightyCore: Arduino hardware package for ATmega1284, ATmega644, ATmega324, ATmega324PB, ATmega164, ATmega32, ATmega16 and ATmega8535
![Absolute Most Bare Bones Arduino - Atmega328P Using Internal Crystal on Breadboard : 4 Steps - Instructables Absolute Most Bare Bones Arduino - Atmega328P Using Internal Crystal on Breadboard : 4 Steps - Instructables](https://content.instructables.com/ORIG/FO8/K9OM/HUWMEBFY/FO8K9OMHUWMEBFY.png?auto=webp&fit=bounds&frame=1auto=webp&frame=1&height=150)