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MegaCore - Arduino support for ATmega64/128/1281/2561 and ATmega640/1280/2560 - Microcontrollers - Arduino Forum
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Amazon.com: HiLetgo 3pcs Pro Mini ATmega328P 3.3V 8M Module Board with Crystal Oscillator Compatible Arduino Pro Mini Replace ATmega128 : Electronics
GitHub - MCUdude/MiniCore: Arduino hardware package for ATmega8, ATmega48, ATmega88, ATmega168, ATmega328 and ATmega328PB
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