Waveshare Atmel-Ice Basic Kit Powerful Development Tool for Debugging and Programming Atmel SAM and AVR Microcontrollers Comes with Additional Adapter and Cables: Amazon.de: Computer & Zubehör
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Single Chip Computer: Easy to Produce AVR BASIC Computer : 6 Steps - Instructables
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Amethyst: 8-Bit Home Computer, Powered By An AVR Microcontroller - YouTube
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There's nothing BASIC about this homebrewed computer | Atmel | Bits & Pieces