Arduino bootloader-programmed chip (Atmega328P) : ID 123 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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DIP28 ATmega328P-PU Microcontroller IC Chip With Arduino UNO Bootloader – Alexnld.com
ATMEGA328P-PU Microcontroller: Features, Pinout, and Datasheet
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Keyestudio UNO R3 Development Board Compatible With Arduino Uno R3 +USB Cable
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RobotDyn® Classic UNOR3 ATmega16U2+ATmega328P-PU Module Board for Arduino
Atmega328p-PU Microcontroller with Arduino Uno R3 Bootloader DIP28 - China Atmega328p-PU Microcontroller and Arduino Uno R3 Development Board
Use Arduino Yun Shield as ISP for bootloaded ATMega328-PU - Arduino Stack Exchange
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