I'm in the process of porting the Arduino environment to the atmega644 for a skunkworks project I'm working on. This chip is awesome because it has 4x the flash (64k vs 16k) it has 4x the RAM (4k vs 1k) and 12 more I/O pins (32 vs 20)
Its the biggest and baddest atmel chip that has a DIP version that I could find.
Here is a video of my first major success where I wrote and uploaded an Arduino sketch to it.
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